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Audio/Video Hardware => The Vintage Audio section => Topic started by: mygoggie on December 31, 2018, 10:02:19 AM

Title: Quad 303 restoration
Post by: mygoggie on December 31, 2018, 10:02:19 AM
INSERT:

Content:
This is a new post inserted to list all of you who have donated towards the project.

Any project can either be tackled alone or people can start owning part of it by contributing. I simply love it when others find a project interesting and want to contribute in some form or way.

I asked @Family_Dog to edit this post so that I can acknowledge those of you who are contributing. Without you I cannot complete the project. Thank you and I salute you!

@Nchebe - redesign of the regulator and output PCBs into Gerber format.
@Family_Dog - supply of the Saf Dem cleaning and anti-corrosion fluid and his patience for helping me start this thread.
@JohnnyIC - supply of a variac
Rob of Pollocks - UV printing of plates

and then lastly, to all of you who have commented, offered advice and compliments in the various posts below, keep posting!

---

Quad 303 restoration

I found this Quad 303 and this Quad 33 (http://) abandoned when my neighbour moved out.

Maybe I am crazy, but I think I will give the restoration a go.

It looks better on the photos than in real life. Quite bad corrosion on anything that is metal.

(https://lh3.googleusercontent.com/77euZ7_y4C2xaSb8TQ_FNFPUF9ZLoZBse7zdIGq4ZVRMNM94INp9ACsn3bBMYP_9OlGpAmZye7YVrxxP5hyQhHKbILkIe7u0NLCGg491sHS8W-O-oKSRHg_0angADcieGrVZ7Q5BwAYNdejsiQie2XSPhHSgeIH_pInOP5Skuia5jX-ZnDDfpy0ThFxjGY18ZsDgGhCWbK7LaMOO899U4woKeBKSZNzj1oj3eH5ULCWXBAR0SrZcp2Ech-2SZz_xxb5Yom2kdARprYC07N_je68hY9O8DDuECdXLN0FkbmUiIC_XFIiovkFGv-lyB2GL6lFeH3_bG3-NM8O8jWnD1YtVkUjTjCxCNcVmcq-nZLvwwQPzrlNOF9uoiYy6q0LeGtRsRz5L5TwWhsDsu2emuXv6nRdLYRG-fopIEi6QVpiF3n_ewuAhw39_PjgDphmZvK9DIklLMm4ELlggdgXRSgeMrjKiuj-oEEe_8gOORzn8tE8tBfFzuLg822I2_bpzkgGKLafP-w4Qss8tuDw4s7vgh3-y5SFU86M9YlzKThm22OOcSu45qU4LBbiW9CYZhrJtuS4dz3s_eGMq8_xXfXESrqt9z4axowfWlcG8wVqcjnAdwAzHnVNnnIGx_BgCLMeqYID5SryVXD8Fj8b1tREY=w1024-h760-no)

(https://lh3.googleusercontent.com/JRHJnq0WAOVqmV8QmeTz648S30JipkBVCnWLhI5xV6odkKK7rrGun7IPNadmuuESBpByKLnjphmZj_hoAemy7pn7_jAgqgdIM_uqu_R9Z0A_IPtUpbCDk-bkMrGy7XqOksrhBNOHeFznzIPFvB5RM8xieE4YGPk0V-UNZUpsxU9tY9d6dSt45sFgQ3TvlCaPJ4RUzb_0fFnfj-tqakfdNLzMDIEA5x5FsSzCHKc-yJiYAUHQllWjDJcUNxaAr6-Qpizj2al2TEfuNKMhwmJKUfZxlAdLp87ORtNLRm0Ry_He2oQcdMtdhE8SjIhtRf8pwXyoGtmpBRFIz5MaZFfA4yUZRNZc5iLbEOjU2SC0hh8M4S7ScNO1xJVHdIaWUGq3jVdE1yvaBCu0-9AsTVYKZUbCGK3yK-6AeQLh26IGDglMuV6oTxENpEZ5x9Ls0hJMm0qU7wgvMDhvBVXOyqRwNDdiWUaaZc6JLfDDWvXgGCzHSbpxYvedVSIjfCiNmLdmyl4hlU29nNBacgcYACGnGdgFS7sp6aa7ppjMlxLrXOtNOQnA_c0PO0BjKYfXu2m8A0rmSDeQBIX7D-n6bFuZ0V-bzyRuCF-4zxx8U6LGwNCbd4M4AHQVWkzE20bMGHZ5WhGL_qVy1s9CH4xtqr8fbmUJ=w461-h346-no)

(https://lh3.googleusercontent.com/D-XHnUWjxD7KdMOg-CSx9TfGomTWhgiLb1eBFGVXJOWBLw7gEomDM8sKNz6AnLae-B_eYn7-vrilGkysg4sevGDbZQcXMJ9kmmLNogyJ9y3U4DOi0VgMs7qcfRwXRRMlMCjjDqkXmcHWKe0TxgB0u8oCissZWUBiCr734Rt6C0HM2NxqJdyZmdBW9_0D6PTDQOiIuQiM21-lQUxBX1uaxMYk-St3tWjFuGynrhHPhbnHLPsSiRlS_se3dD6bxRavPMlPJabGaxftJucFmn9ZyFQ49GQBMSd8I63oVoXRdSmK1J_3fHdY-TT2xnEqdXO8q1aZIyGMuT0SHLSeJVIUO63SGIBHYSHO8i8v-KlaxqcKnPFLk1i4L-SxK9nLFsaajW8pi-14tc8zP-L5e2DC40cUp9GWExhj6eENzKHupFGtx4Cz3KfRIa1HqvrEU2fHeZOM-N_uFay9emonSg38wOlhKUqROZUwaKILK0fM0K3w9DfT3BKnosMh3OqWJ3OdJ-FqN2dnBADHddm7X6CpXcpiqZb09r3dj6tsUX0uLjALZ7oDH7W9zKRoaZXeFPvL5YT-ISt-lKuglHfoMKB6afMH4zPy2uPLtfi7xXLDjI3TB1mmM8FDYQdNvL4-Y55b7MGP9lE8BU_ElDG5BFqYojyo=w2046-h1534-no)

(https://lh3.googleusercontent.com/47pcbEy7HVS5ucUwaYf5hqaWcC0NPe3Y0QXkIFuzEL_9OG9CuTp-S6QPr554ITX68hgT7q4cXlo4MlkyVC74AUIwY7Mlmhu9o2pIv2D6vlNEbP2-kiyDNGAEKwAgoug4gvitwC7UlJISBPIGmegqvY_Iaj3vQcg9OfwLmkGttFqdMQJA3Gzq2lv_XDsmLUHvwbEFXd7Hfk4R9v6cKpPJ7JojgUPn1YsVzf7INNsqQaW27lS4MOannfFsFVHBfkdWvUzjVgn7XUj-I7_KKhabjTDIPijubiIzz21oxwSZhlOD_L6vRUT7tiA4t-jjU7E8bQsUrcyYsgaUb3XGxuHtriqMMqB3v_ZCR5Irled64RKQAdGx3j8PjwqK5GZ7Mi9sTfB7-De9GyP1u3F6mEhYArFi2LEO72kXg6CWwwFqL6NRSX_MWfybj1K801bWBHbPemcsdSIyippBXOGsqP8tY1kvZ5AMwQks--4wzgSne9XQQQPLSAMkqL1gNHVqNqcElhyee3PZoXFsTcoaUXCNbU7KKbSoaQAsXF7vAdlSTdC4wU2E-eQE0wVVjBgqKbpKzPxINYEr4F2Y7bmaBaWU5zLAtqJbhX3ihHmBrFSh91sheGdfPPO7o8zPKyikXxjGN0SmBURfjyOO2CMwInFoG63A=w387-h291-no)

(https://lh3.googleusercontent.com/TzUzoDlN8sIvQe--aGDAnpz3TlZd3sBYnNhDFzWLc9dzIAWLk1-cfc32AeTTxdoEpBMuKicwiXFjeyIeWcKLhf760xl4qGHi_2F8Va5sPlhE7tqKt3kCxLh6jDQMPo_4uhjibZsfXdh2yKDkG-k0T7BSZcb4s99c3xXWIeB7m83iA9kcV81PXA8Z8f4lhYMv49du5a3bE31vF9meO69NDMK-KKgsJv5om5SxPpmYiY-I3pNl2DP9IGxKVFsu7ebbcQEvwf3uIu77DvG7mq_bYHYRPA5TRPj-bn3KI0HJVxWsmSFIAgWNDi5fYuzlmFkdK4_EpH5nyxSnyOjbcrxnRKWDPD6rwtccnfKGth-dIZis-YzjQ6DOWVHWSymAn_INrrOsg72DDyqgWsXspCqREKj1nMLuGK-Y5GUUg3oMnQgsCaFL0zQAEHC0jMzYLn3Lj2-OSn_F36EUJX1NLJnGYqo7YjtGvvbbxpmv7xY7k8CqaE1IvyJMahaDC2ZwZq55cDDKRCLuBivMqWzLnwdkDZPH7jdYfldXL7wfyxpvIe3sGhMgs_8qeokpkw601ZOITM34Fq9YzoUom-tVH8IqfXy84dBpd_bXFf5utF-2BCM47yh5FXJZbFVWuufeeifZXYa3JMFY-uzt4bW0Qidg7lYB=w218-h291-no)

(https://lh3.googleusercontent.com/JtgL_hJBRMFcdZ_bePucMrf51deBOf1Dr6VvKhnwTv7OMT-xpgvFHYe9hnniTWUKxjldJT2-7jfMnYiOB4s2RC_PWXXs5VUAIqUxMb5TyJvM7Mim8xi3IiFMMqoaawTQ9XCPnllM5aT0kEKeYPFyaXf9jbOSx96R6t8hRBCdOk27vRc8UtzoDGy6wuqgs2kbr9y20Ou02aW32EZ1sfJTS-4VLMQfv4UT8fxwnNlKobr0moz7PomAAhmLmOjSULutX3jr2vSZlBHX0mkpl7Pe6w5-SYfKQ0VR2wuzJwZitM25b1tR_gHJGLK2PZWYFK87e9Zu5bsdrCypwel7Z-lMVzk98EJchs23fyi28Pl6SxDWOilMPBj0ZVRqaAjNYNa1CpxBXgdygAYk93ryFfiGOwVopQ-hnapsWIXl1kSKpbdEpbNyOAgPjnSYSHkGrehgibTWgpRp5r6YQfOgY1P57m0InXbE0aNgs2taM9osmSqAnjsqsuJeKmuPRnk0q5t5v76eSc_rkZMo8BBSt81uNNMmV_uLVNhM7OE8UdQp7aUQT8yyOBJhDGEpZYITi2yWbaNYYhyVziIsRi_bG-DfiwbhWfK9Fu_It5A8kRfNFXmxTNW39CgYkraHJv40QZ7VU2Hs9KHAPI_-GAn2hEWuMaAV=w388-h291-no)

(https://lh3.googleusercontent.com/h2_VLC6fxxmgBPy3M3UzzF6Fa5UFCqpUZo2FbXX3aZvx4rIir0dCqM9N1CHEFsQIptg5WgWzZ5O0lQ2hPju1Icg3otaeM9gdgqviRvslON7qb4Z479Wd_yGAXGL36iyWRL4jkm2GWHpNrW7N5zmex7d-8vZI3FZFEgiSDp0bwhDTMbQPOxwezVoZ8nr-DNpzkVsfbSpPDWJqt35Ifwnj0ve4xvcD3Try8hKU5avf5H0JqboHbpb4fSw6ukS8DFEz89WHTCKXGyio6amFRR0nf5JgyuEut0ld-9KT8NVeYqlMHmicCSG4_NqfokydLrckThGPdeb8Gm_iTEUYFd5AhriO9W0o8fifPSU8nf6lFk8iP5bfDwsQTDMGKhypl-vacXMJ3eZxn_uIhwgXxiPGXukC30T1a7VLZD_FG11Rx1un8kK5Z8vzsuT5i7XUAtNYShx7-nNJLWWKDArlOgSAYOI6uT8hf3oFeHQ8MrGkFunaRx_7ULP_RNA94dyU2g3iCl-bHEFfJV4opazY6aK4JG8-Qs6QhUsIkqc-Zv2db4_iPfoUP9ykKY1EKylFj1TmfQbouY3QPu-1IrQeSBmSc1IijSL1xXYu9aZqGdUFSLXBNgY32i4EoiNj2p7H7tGoDVkbn1NU1m0pPD-yWWTgd4qsssJaGUC8i8BF1REtWviHZT-vrIrzPT-sGHaYG_7L-E6ydi0Pmv7XL27-Sw=w2046-h1534-no)

(https://lh3.googleusercontent.com/7JUBOjGNNC4PcPUA9hJMee-bQN1HvBB8ijYK8f1POo-10DiZ1Alwv5fE076WFse9cJtThJf1heKXDi7zJo3SEySFTojMe3VdCHOlxeFXGvgqJmrujzl4uORuZVQhQILr3GnWD7jAl56QCkCwALatlVyylE9kST8g45sYGb7o2YfuBemCNC67f7fsm4mG5lv6TJQn09mhZrwH4kd4F8dHuG4xfrgaUVz0V9tEvcyx128V_lv8m90l9FGFAxADlI_Vd7bXMW_B4O_17olf7mzLWQNvdxa8T2215ljLNZyuCM_Qk5cccFJN9P4JA7kGYRq_3XaHA0MmUfYy70058Z0wwCPYL1SKBFmlJFpkRG7gycKGQwZSpIdzDxWxS7rLtRcNzf6ZaPjqe63LvT2tn40-BxvNLPM8hT4SHgQc2Z_ejsrQGdFZughfVXO2JkmPhiZokuGs_h6Bpsk4viy4GkIDa5rPix-bB0926SddYRt4wd5SlAMo5_igtcSrR8kd9MKZqfWestOOwJx7ydIOM27jMx1NKmEtYk5GWfmgi3k-F4jaKQPiXzI1zVoH-Qe95wtf2FxptFqBS4qYQYRsJr8BEYslAnNCiWyKhKeBLsXZxpBFrjEAgxkrIx_uc6A9I2DZ1W4-avnIcs23unXgA0jOfAbJ6-h63pKu4_kRyvyAk5rY38hhW7zfMjbeimfPsBbiB2NZ2ToM56swWm5dnA=w1152-h1534-no)

(https://lh3.googleusercontent.com/SwAl02S9mCD_qIQss3unFb2rKaZOf_LGDlX_ywY9orbcvloF-4XiABTNMdJe2DGJpbQUWAy-I3qFD8x7hZ4__oQlYC3uNuBgIBwUd1iBpOsHaADASiloBj8eAoopxodfic_fZeGZBKLxknZQGQEyjk_vEDYD5QjoPtgXT7GB04CaxIXVVwHOc1VIfa24nLVksbCw1E1L6uDPpIEuslUot8_vdYwnmljVZLDKlahs6oNANB5S8APx_UYoHGmBmyvvVZ9_etLkGMDZGW2x0yTFYgA7j3DCPLfo8nWjG1jkT-yAT01hk0x5pNJ-rOd2LkZ46L_NsyvPEfA5w9ByUq_2LAX3Fes1rrD7DVnGEGCffNkirEfwjRhAAjqUHMImbK8Q560rRGDEZKx3Zxp-hhNj54Gx9vJPp_EO4C62oMXcRIFQ0cJPWqHdwIMI-cHyDilloY0Z9TFUjbunPtMZtEMZ2MaDuZDFvaXcDac4GNhqtj_a37VWyzb80WkFMuANWb0vBJhKqpeMRiDmiDA3aJ5om1LH3jVE9WLzE-l0mIa0dcLhV6WeAB51X_dnlMFBLenvEt26TngzYmqKCiBqm9UBQb7zuQdWC7QnG009UX4VzTB1EQVffUeOr_T0ouY-UGL3ErwVWw9dBJ5bbV_s4_iWKaCr=w445-h334-no)

(https://lh3.googleusercontent.com/4ealn4v1QhUqJTD6r4Ns0-SJ7Xklv6aVzznRuFJ4I940Xa786ezbjtnbAHk4SSyPGvq2Q84b2CI2tEw5xLqRpiUMFlmzg6yhAx9sg8bn3d2ZCPSBLluN25bwPiVz775fApfFuZD83r7u398-0E9OWvedr_Gc1rZWAKugWUr3udOZwgRrEfolDO_XGWBVxEe7DLyGdbe5nj9HaO-dkPAJ2gEUrd5ltNajeRK4MD_nTNYCYALOA9-wfaPi1K7Vtgy2jdhaS6kmtHin5la1uT8yjY72LDnfSJo4JXpQgr0HBrPh_O3gHB_-UtJzsYiBJhHvqFy1C12dz0qd73tB51REVZDkgLkNnAOKZCrALObhAm3hyecdQbj5VuIcd-gPw9T47dH4nm7WlVjnXN-cL37be66Q8DoQrpTeUO6760LYtK7rCQbJj2xnAPik_2W00nPNVZKaoRyZnqgbzR_VXKCnanG76_sLDNb0PkGRzkjXfPWej7e0QWrkE-keZfpyEek82Vi-clyqZTO2tHCRP8DpBPIiodX6uZRCZOItxCAa7JxUr1CU79__8GyPsuXXwTFfT9t0Fxb6CZwskMIdtczxd7mIVTC_Xl8t0tmqznxRX2UXUq9N4RzJ_Dml-TDDE30uPx-QLBtZGHH5xFKh0fSw68mHQl4VBGb_p8gIEzScPJcTrhhhKx-cOyas7RZfR5FHVkeQco8D_CA4L-aEpQ=w2046-h1534-no)
Title: Re: Quad 303 restoration
Post by: marantz123 on December 31, 2018, 10:33:11 AM
Is this the same one that you posted about regarding the BC transistors needed, or is this another find ? Good luck with the restore...results should be pleasurable!
Title: Re: Quad 303 restoration
Post by: mygoggie on December 31, 2018, 10:36:42 AM
Is this the same one that you posted about regarding the BC transistors needed, or is this another find ? Good luck with the restore...results should be pleasurable!

Jip, the same one ... just had time to find the parts first and now the work starts.
Title: Re: Quad 303 restoration
Post by: marantz123 on December 31, 2018, 10:50:14 AM
Pull those to5's and to66's and test the hfe, diode test, and junction resistances as well. Check diodes as well ( junction resistance and diode test). No point putting in new power transistors ( if needed) without making sure the driver/input stages are good. Those 40352 RCA to66's might be hard to find but can replace with TO220 packages. To5's are still available most places.
Title: Re: Quad 303 restoration
Post by: Family_Dog on December 31, 2018, 11:23:15 AM
Looks to be an interesting project, the PCBs look fairly respectable. Would be interesting to hear of those power transistors still work ;)


-F_D
Title: Re: Quad 303 restoration
Post by: mygoggie on December 31, 2018, 12:23:31 PM
Looks to be an interesting project, the PCBs look fairly respectable. Would be interesting to hear of those power transistors still work ;)


-F_D

The PCBs have had a too hot soldering iron on them. I will see if I can recover the damaged tracks. Will post some pics.

Looking at the power trannies up close in real life I shudder ... will start stripping on the new year. Maybe that will work some miracles.
Title: Re: Quad 303 restoration
Post by: HB on December 31, 2018, 12:49:03 PM
Nice :rubhands:
I have two of these. One works ok after a re-cap.
It has a hum once powered up though.
But sounds amazeballs!
The other needs extensive work and might not be worth the expense.
I wish I could just buy a complete kit LOCALLY as it's a mission for me to source parts.

Subscribed.
Title: Re: Quad 303 restoration
Post by: mygoggie on December 31, 2018, 02:02:17 PM
Nice :rubhands:
I have two of these. One works ok after a re-cap.
It has a hum once powered up though.
But sounds amazeballs!
The other needs extensive work and might not be worth the expense.
I wish I could just buy a complete kit LOCALLY as it's a mission for me to source parts.

Subscribed.

I will post a parts list here. Maybe I can order two kits, one for you and one for me?
Title: Re: Quad 303 restoration
Post by: charles on December 31, 2018, 02:15:35 PM
All the best with the restoration.

The mains transformer and the PCB's still looks o.k.

The power transistors would possibly even work after removal of the rust.

Title: Re: Quad 303 restoration
Post by: HB on December 31, 2018, 02:18:42 PM
I will post a parts list here. Maybe I can order two kits, one for you and one for me?
Fantastic.  Thank you very much.
That sounds like a plan.  :dop:
Title: Re: Quad 303 restoration
Post by: Family_Dog on December 31, 2018, 03:16:42 PM
ChrisC mentioned he will most likely be placing an order for components from PartsExpress in January and has invited people to contact him for a joint once-off order. Contact him.


-F_D
Title: Re: Quad 303 restoration
Post by: HB on December 31, 2018, 03:35:48 PM
ChrisC mentioned he will most likely be placing an order for components from PartsExpress in January and has invited people to contact him for a joint once-off order. Contact him.


-F_D
I took part in the last one. It was such a pleasure dealing with Chris. So organized!
Title: Quad 303 restoration - PCB underside
Post by: mygoggie on December 31, 2018, 04:48:28 PM
The three board's underside. Do not look too bad. Nothing that a resolder and resin remover will not clean.

(https://lh3.googleusercontent.com/O5xNjAXjyYYSCqQ7ChDkoJwgdvA2gVJK9WFjKb5KHl1X53uD3ex1e3ZCCkBGKYZS7Hj-TOVYAQn5hNO5mXXbDH2GuF0qU1Q0A1pUvxUNJn1TR4qwgdRt3FKbwinGejTdtay8u5E-03U7674JLnKh9UC4dI9wv1KhrBC6mZtckELk3fJyOUoa0NoGzXkHz_XdGmNlCStpDXLbno6NSTDHt9KWSc2-LYWePhLV9bL6JKGHFTZl6nXZcW4BqyUv2jWSSklR1S__bPmyua-560HA6iY-YhK2Sv9YyYVJIbJp4ouWwbPVs3dfaBAHZ4abuvYpYzk99_P6BSQO95UNKGpEtaDdYAXk9HGfZjZN6V97G-t-6LSOzua8hIs_4HGdq0cN-K8NNEoHOowJ6dpzyDSHvc8LYrGN7xr5KDfWJk42E2fEACZ_kENW6oZL1tkS4P5UILMzmUD8MqHMDPNBc08iYm-Xk_A57ZxuJ2NEyfzruu5hgYhqqLw_5D9P_IIVNlcdCW8hdHhlEaT18pjIOoulSi4j8zFLnagTLxZDtFgSZwdDnkBd5kbqNFO5McWrTuiPisnGX6JD-BYZOUwG38Vn8mNA0tIdtIz8rYitpPCtPMJIoHfjyFOXv3JCWpkDLcbhKWQH9xocB3lEkM4GuWBnQYKkJL8oDdoDJ1EQPjvvCv3N5ca_NK-_VKGPeconUxqwHLpwHjioYBRB8m_lqA=w1152-h1534-no)

(https://lh3.googleusercontent.com/I-AUsvG63VRGeF78DYQ68oMhClSfl6hqeHhryOep77jd1N-IyB3tY2w_bJOhdXT-ZR8z_x-1rdIUUaMdmqbfkso0DuWt9vfNbVg5NYW2f1WqLf3FDca86jJjPgqzttPN__ZH7JQceOipbOq9IydDfS36QmxEDU23ixZBRL7eBb6AGigvWFGImuOE2jBPkRrTimahhnDcPWlqFgoI_7hp22L3SKC-HUnwcuUSuaKVQ02U2KgYxemVH1lX1xirzO6h2VtCa5WzM8FDBtUCYLqGb5MHPI4WeqeDjCnIutWvGq9Fi4d-tYxLVICOxnnGOmVoP2KZXesYwgAmDTtusg261aSoYsoChECpWc2tf3tVmgJlOhCl_JoyiCF9Tbwmcz9gMNcn8nBRQ587TXrU_LSfI1xH8RfNfMQ7idxiGnHjziDfAVqZ6pPZfzYwgkLgCBfZ2IDzq_ek0KklhsHOB2dXAE2KGGy3olI5dung-vNW8A1kXNt7OjLwIiNdKw0r-pr0GRxoeqUx8OJ-s8M8Oxs0XhkCiP3ntWh1Oi1fW1-8Ea1f3LqF43_sSeWbYS8-LQ2asAQJunpgXmHsMZ9WGXFDHmy0lxU40ehT2gMy5xQBexrmjYDBIPhPOWZ5XrogG6ixCjAVhIx3c7sB_9BCghKsU3t3TSAbXF4DlME-h9FuJKNCXmkN1ZPrlc_DTqsZjxtUAZKopZIYS9x2zU_6PA=w1152-h1534-no)

(https://lh3.googleusercontent.com/zSHbpHwB9HVMWWoXTWFoHbfywWHTeYnSLY58HOLgRKM1PysaIPpy3_1p9z1M9j_1_yZLDb7AIugsUL4S-ssL7U8gVwO273V4b1h-ZBpcbwKXwUY-kBwN8N9icl2giXzjH_G4yZwACGI530k-u8o5WPEZj3CIGbGc7FFB695fi5-Whl3WKfG8TGWwpJRByHz8NyG9soDjMM66ibeQvZdklmVfeYImqAH4p49stz_ieJCF27SOyR1-Lqdu5RNhPTWrx9b0nKbLCxHCvEElsgNzCFcKkSkOuo2w5m8X1X_hXvHuhihzSCK3p6SHmJ8daqzdCYIat-2wkoxpss7UDOSAB-nZ5wF3BcNoSM_IG1qsmBZRaedd7lXx_qBQj2xNgskV3EGBuRsl-UtmY6ikftbc0stEPZiTRPUIBaHO3cCUzpc7irBQ-HnWYYnCZ3uPmIlGR3VNWvbh1a7gpyHPyAl5rh-3OVEoOaQ6_nXJosrkNs-_DIM-E-QXcy_kddlWkTVXBSYpTOXQFP_MIqq7srS8WgFvJCXV9XzJoWp1px3lz623cwPo0v5aZ-PveDymByliM3fKIIEPvX82oHlcJg_LQYBvkeug9JwCxpvbwL16zlfnp65b0SWD4Fb__6EmMazNH-D6JxqQF6_rVZ-yobOgYPQfl7CJEa2hbSlgWuSDDDELHJYs3dy8db_G0TPYo2PwgnKTAV1IIDtHFvhaPg=w1152-h1534-no)
Title: Quad 303 restoration - Disassembled
Post by: mygoggie on December 31, 2018, 04:56:34 PM
I had an hour this afternoon before the braai starts. Stripped the unit into parts. Glad I did it as I found a number of dead shorts due to poor soldering.

The aluminium ends will clean up nicely with soda blasting. The rest I will send in next week to be chemically cleaned and plated.

Anyone knows of a face plate template for silk screening purposes? Otherwise I will have to spend some time making one up.

One thing I cannot get loose is the voltage selector in the top left hand corner. Anybody has an idea how the selector comes loose from the female socket? It is stuck ....

(https://lh3.googleusercontent.com/yonVGh4ViByCV_5PZaaQNsIVee0hUBvFWWO2pKE93CslJf7xDbH-eCKanzPHsWw39Nadg8SDHZG3sVeSQ2M37loRoVE3x__qu0A5Vb7W7RdJeetNVNtPcGdY94g4rhHXd56MH9WHhEFg96Lp8F1znPBAiqxgEBgO1NYNEMmvpXTtJXQ_ksyuo9PGLaZ94kGyh1usYylD5edIrx5dNRDYvraE1XS4bQIpY_U34aOvFVhoZfwc542yqKrSw4_A4_bdwgVyD370Kpm15NmVOgKsVmmnI8_7m_4uyyabvqRW4O9Vnjbh8rlNBEVqtvP2aTeSAn96zbQo5E4L6cbtqF_VoQ1q65vkGrbnQw1h4aT43sTokASqcolk9PI0rSQkpguN9i2n2khTagOwBi6Vs8fZutJ1wC9av1LwZjjkDFl2QU3ipIwZRZRkMbEgO82qfvW1jyXh1HbIDec7RU1jsmlNXNaXFv-CAomzEXOP86OOy7a5KecKZlf9Cte1pvOBriNxX-Inz1Rtd2_H_wW1YX455aTX8ixYfsLQ1z-9OS0utO4L5RxJKxO54Omg23wVJoE4o4gBgJWihqB8nI_hlejJQHSeb2es-oQj3qYWjEa5Wd4pXmqsnCl625HQC6pEEbfJoHcYFw5CvAtQuNTmg9cAomB1IdYS0sOovyuGsBQsjJPlYUolEZrfnn821fmmmKMrTc4pdzYUVdCO8ScPHg=w1152-h1534-no)

(https://lh3.googleusercontent.com/lJYISj5dphiUbr_V_sPmf3_jBBJCoMrY29_-vBxytAXXf1p1LdO-jHIrvl8M7HD7C0a1Q2yyE919lfGzHTLxX9SR5h7BgqM5EI8MJ9gWO3eDxPSdM8H2Y-GZ61YJ328fyYh03sL5COyoFDjdteVZVQbPs7yTqNL3VVe_PQ8cdz02luivE3TYQeItPKV71teyaeGqa-0mmPwjxEx3o16fI6nUCXh2w5VOyBo0Mrn8A1waJvXpILgU7Ou43kU0WWgOttMrtGlR0IH2Sc1X-JtSjzdh_olQpjmQeT6Hgb11DEr75_wd9lp4EymT5T4nqqDINAQvoPLV_fZpsXaHIMeiwB-IGWCJvWtIKJT6_VE8V-tlIK_gI-GQ26NJ6q82UvaW8UneKOns5O1VYbq1J_RqCdzJEmS3F0cj8xB-SFM_DXXfircH2jd1Ir3lqDUv9i1nSZJr3tBHZE3U5Ki2Fz50X84zzEY5XcI3AW8kssRUkW6MysXeISoN4lOVwJjpAJuWVO6QsZB8RqWn-sw2_SjTTq4ZnuoJoBH7OPKo-_ZqBV0IdnBXHmk4p6Ci2Cx9u8ubrKLw057QMTySbEt2WBAQHC2EHKKE-0Zf1MmhyJMpToY1p0nKpZqykkxbADIKM9pbXrmghHNrO4fg8ygkuRVYon7bA1Kew2XPxYR20txBsEmW0BX73tcePPRka-BbOTyTeVTmfIuLNH2c8h6O2Q=w2046-h1534-no)



Title: Re: Quad 303 restoration
Post by: Family_Dog on December 31, 2018, 05:29:30 PM
I would hazard a guess and say it should pull out but has probably corroded and is stuck fast. Liberally soak it with Q20 for a while?


-F_D
Title: Re: Quad 303 restoration
Post by: mygoggie on January 01, 2019, 11:30:15 AM
Liberally soak it with Q20 for a while?

I followed your advice and soak it in Wynns No. Five for about 30 minutes. Then I put a ring spacer over the round black selector and put everything in my woodwork vise. One jaw on the ring spacer and one jaw pressing on the small little round pin that protruded on the back of the socket. I carefully applied pressure and "crack" it came loose as you can see below.

(https://lh3.googleusercontent.com/4bgZ4zEhwNHjteB7m09FkiQez6A0UZwYX_2oze9KDk89akTUtLYgauFgy7GIqCl9Rfjf6pPr4Q9zlFc5rjFPFnYtdHgBMqsDsGnqe13myrB3rvvXb_BclW-YHy4QPUP2QltxpJ5QR83DliCeGqSdJK6tKYboZFkEjGwrEnJgiMiV2TFkDDWTPN-lK3_4O6u-Lx44UDQFH-OgI0DUn9ahg1yYFwsoDxOb41-tU7VfD2zQJaCPkir4SU1SPzdbXMtpGIUSgqLu3Hct5CwA84YEmXK7y8bUHfOd9Cn9MNqmv-6d2QxMIrviF8FHNTVvC05j49FVIR62dwbP1AxrO2ReoB9Kz3bsz1y4BrNDLOllCF-t_XZ4x50i5lP-aX7V4uflGOHU4hKllzyNxWGc34kZlltpZPk4Yy6aljfxU5jwcV_JvB6sRudw_OH0wWV9eKJZ9F7icdPAFeFGt28Ec0L_bJUuxWjX9WadLTBAVPuavEP-NTGYmY2bcB8jKzPZ6b9sHB8rcNq12lWSB-nHevZwUHRSph2UlEbEklet9gM-8PGoJQwpOPmPnkTd1f5sRb1tI9EEHOZNqirhV7Hgiy0IHUZ-3c44Ce1pTcjna4GGKGO-P5vFCiS5Yb24kmQDslQ4v1D9h_fTegcIQ19e3A7G-hCkRbtuHEG4K4X_KLDtujiiSrukBEDq2hWPkdAKY2VXHWFImhhsqki11QZnDA=w2046-h1534-no)
Title: Quad 303 restoration - Solder
Post by: mygoggie on January 01, 2019, 11:53:43 AM
So I have been reading and it is clear the solder to use on the connections and PCB must contain lead. Now I have some old solder here, but have no idea if it contains lead and if so the correct ratio.

Anyone with some advice?
Title: Re: Quad 303 restoration
Post by: Family_Dog on January 01, 2019, 12:07:31 PM
If it is on the old red plastic reels, probably is lead solder. Unleaded is a bugger to use and requires a hotter iron tip, so if the solder melts easily and you can adjust your soldering iron tip to lower levels, it probably is leaded.


-F_D
Title: Re: Quad 303 restoration
Post by: mygoggie on January 01, 2019, 12:32:56 PM
If it is on the old red plastic reels, probably is lead solder. Unleaded is a bugger to use and requires a hotter iron tip, so if the solder melts easily and you can adjust your soldering iron tip to lower levels, it probably is leaded.


-F_D

That is a Roger and a Roger.  :2thumbs:
Title: Quad 303 restoration - Paint
Post by: mygoggie on January 01, 2019, 02:27:13 PM
I tried to loosen the insulation plate stuck to the inside of the bottom plate by using acetone to dissolve the glue. All I achieved was to dissolve the paint and in the process made a startling discovery. The paint is metallic based as a million little pieces of glitter started to float in the acetone!

Next step is to take the  :flame: to the glue :rubhands:
Title: Re: Quad 303 restoration
Post by: Family_Dog on January 01, 2019, 03:28:59 PM
Old British craftsmanship, from the days when people took pride in producing a high-quality product  :thumbs:


-F_D
Title: Re: Quad 303 restoration
Post by: Family_Dog on January 02, 2019, 08:07:04 AM
Herman,

You might do well to browse through this UK forum:

https://www.vintage-radio.net/forum/showthread.php?t=137769&highlight=quad+303+restoration (https://www.vintage-radio.net/forum/showthread.php?t=137769&highlight=quad+303+restoration)

and here:

https://www.vintage-radio.net/forum/showthread.php?t=137769&highlight=quad+303+restoration (https://www.vintage-radio.net/forum/showthread.php?t=137769&highlight=quad+303+restoration)

They recommend using the original 2N3055 output transistors in place of modern components, for reasons of stability. I'm inclined to agree with this, the rust can be removed with a pot wire-mesh scraper (what does one call these things??). Their suggestion is to replace the power supply caps with higher value electrolytics (6800uF) as this will improve the bass response somewhat, equivalent capacity caps back in the days when the 303 was built were simply too large physically to fit.


-F_D

Title: Re: Quad 303 restoration
Post by: Family_Dog on January 02, 2019, 08:23:34 AM
Found this site as well, in Dutch, but full of pics. Quad 303 about half-way down the page.

https://www.quadrevisie.nl/quadrevisie.html


-F_D
Title: Re: Quad 303 restoration
Post by: mygoggie on January 02, 2019, 11:59:50 AM
Thanks Eric, much appreciated. Going to take it slow for a few days now as I have tick fever. Will spend time reading when I can.
Title: Re: Quad 303 restoration
Post by: HB on January 02, 2019, 12:40:11 PM
That sucks! (Pun not intended) I had it about 6 years ago. I removed 5 of the little F/suckers from my groin area :sweat:
I was at the wild coast and made the mistake of sitting in the short grass.
All 5 infected me. All the symptoms were present.
I lost 7kgs and it took about a month to bugger off.
Get well soon.

 

Title: Re: Quad 303 restoration
Post by: Family_Dog on January 02, 2019, 12:52:49 PM
Sorry to hear that. I camped at a very remote spot some years ago and the little buggers were everywhere. I bathed in a paraffin/water mix and that seemed to have got rid of them before they could do any damage.

Get well soon, I will miss my daily updates.


-F_D
Title: Re: Quad 303 restoration
Post by: mygoggie on January 02, 2019, 01:51:47 PM
Thanks guys! Pills have kicked in so I can read some. English version of the Dutch site is here - http://www.quadrevisie.eu/quadrevisie.html
Title: Re: Quad 303 restoration
Post by: pwatts on January 02, 2019, 02:48:43 PM
I did loads of mods on a 303 I restored over a decade ago.. was fun but not worth the results and still comfortably bested by more modern amps. Nice little hobby project though.
Title: Quad 303 restoration - Lamp
Post by: mygoggie on January 02, 2019, 02:58:28 PM
I need to replace the broken power light's 220VAC lamp with a white LED. The lamp is 5,5mm diameter and clips into the red lens that fits into the faceplate. It is connected to the power selector DIN socket via a 100kΩ resistor as shown below.

(https://lh3.googleusercontent.com/qrzQqInxjsAf0KE2pNyOYADIw-NERslGAxK_g0EfFp9QA6tTkXwVolriw_nACLswPFvsB7jpmoVBwV8ndXlop8olCxpYr_AMKHDMP3gR2Awqt1eDgisuzoD9w3MtpPimXI0Rpf2CgxayxGSEZieEZobxnHQOemjppxMmfg9CAm7bHvWqvm2rEpKnGztQQ_OlJtObg7knnUkcxH9aSYtPC1UNq5Xc9SeBFqqfYghRiz2r8hBM1Fu5-8jggRf4CWn6e8ikfvImfDdSSNjXjvcHSQMv5b4wLKrgCw_nnPxDBJ7mKPqn8msWVzRZeCHAAOKmwS0ZRv5jKVbAAbIUp_5rtcp7pECQOz6xbz2eeo6yT_hKloqb_JTieDQ43LfRSxD2OMIJx8fJXP7xUoUNH5ZMLePo3_cqLVvluQRsWeHYbtaCmnlgfuXSD4bxVMp6Y-3PAU66rsk5mP8Qe0XPOrPdbs6v2dEYcieKredlG7OFijVQCXzrTlpvyIgEPtLCOaTz1otDOHVd2RjmbpOTqFyxpRIt11NvjeKqalnLQtJhRD_C5exBdFYE6hVBuQO9XDWewqoITKzLmc9ZJhWBjAJSAC04rVQjJTZB0-JbJgbX3VOQ6VMnfHcQKj-yZkm2JgU3Wl7hBa69lcD_aC0VTe6nNUTOfvXI2lWNgrS1MmHyujwycI1PXy59FURnQ9tEwV_S49SZBR7a8zVfZ2UeYg=w823-h617-no)

I am thinking of using a white LED with diameter of 5mm and viewing angle of 70 degrees (SSL-LX5093UWW (https://www.mouser.co.za/datasheet/2/244/Lumex-6-7-2017-SSL-LX5093UWW%20(S-D)-1176541.pdf)) or 110 degrees (VAOL-5701WY4 (https://www.mouser.co.za/datasheet/2/423/VAOL-5701WY4-1064923.pdf)) which will slide fit into the lens clip. Now if one of you intelligent gentleman can help me to calculate the correct resistor value to use, I will be most appreciative.  It will obviously depend on the voltage, chosen by using the voltage selector as can be seen in the circuit diagram below with the lamp V1 as marked in yellow.

(https://lh3.googleusercontent.com/MyL7UY1x5oyV1s11MsaVq9kmdnridd3VvxxhBsQVA9Pv1fTZEqnLNGnclgPSmInGapBpZeUv-z3iTduSVOWZyMJ2Opmioh9cLogysNfYdfOhE3QMMKC869jVe3dCvAUO9kvDKGGdRe62enmdCCPpV-UkeRQnX4y31sSP1EAxE4WmwTJtIe3Z-N8pFVQs22j9yywezossVdBF4y0YLGFUhx3TDqnT_vz30Fdza46yRElVZz3ougt_Hbwz3AMzL-TRpBt9TfipGTwjual6zlgtdK9-Z4x_LN_CHJ-fyqjPoXP5vRvLu2gYvMWx329NkIXRZcqi5YULFMDNppejlAp3JNcfMPnZXQSx3m8Y8oNCs-xsIJkDGDkxfpjQOUCVi94GaaoaARqpYDPOTIs5htNfv3ETSAZ5MbPy0mFtojpbBZY5DetHHO0oZ9PtbhwJMWm9HgU1zujYArM-dJVIOVVbijJcyv2ZRVEGmdgoS1U7VdTOauRHwzca7NZh7IlTJP7NTWZaPYig7Qc2DBI28C41i8DNU8nEY10ZUT7Iefac3j2CCw03ivAHjEa4qyiEBrTMR47fB7UQ3IsjTdlxMIewa5hyu9fiqLvn7O5tg1K7C6uEcBn3YhfexS1TNGbKz-taXF8A6Fra9CR2O4hVLgV4Jl6reTWhFrqlopZG1mzLBxFUSxWzr7hSkoyzN0wt_H7ozU2n13eW3KU-yPyygQ=w359-h666-no)



Title: Re: Quad 303 restoration
Post by: mygoggie on January 02, 2019, 03:01:43 PM
I did loads of mods on a 303 I restored over a decade ago.. was fun but not worth the results and still comfortably bested by more modern amps. Nice little hobby project though.

This one will be 100% standard as far as possible and then matched to the intended electrostatic speakers. Let's see if I can achieve the sound that made it a cult amplifier. :winkwink:
Title: Re: Quad 303 restoration
Post by: marantz123 on January 02, 2019, 03:42:35 PM
(240v - the volt drop rating of the led) / the current you would like..15mA will give you the resistance. Critical here is the power rating of the resistor. I calculated at 10mA, 240v, 3v led volt drop gives you 24k resistor at 2.5w resistor power rating.  But...why not fit a neon lamp..its easier?

Calculated at 2mA, you can use a 118k resistor with a 0.5w or better a  1w ressie. Experiment..a bit for the lowest power..maybe 2mA-5mA will be bright enough. Also...resistor voltage rating is critical. Use metal film MRS25 if calc is 0.5w or below, or go with PR01 if 1w or less. This is the basic calc and design but rectifiers and capacitors can be used as well to improve the circuit.
Title: Re: Quad 303 restoration
Post by: Family_Dog on January 02, 2019, 04:57:19 PM
I need to replace the broken power light's 220VAC lamp with a white LED. The lamp is 5,5mm diameter and clips into the red lens that fits into the faceplate. It is connected to the power selector DIN socket via a 100kΩ resistor as shown below.


Or if you want keep it original, then a great source of Lilliput globes is from old Rope Lights, if you can still find the type that use these globes.

Google says the 674 Lilliput bulb is a miniature 6.5v 150mA globe, these are the exact same shape & size bulbs (albeit 12v 100mA versions) and have worked very well for my restorations. You might have to play slightly with the resistor value, but I would try it as is first, assuming you can source an old Bulb-type Rope Light.

http://www.internationallamps.co.uk/landingpage/The_Complete_Guide_to_Small_Lamps_Web.pdf


-F_D
Title: Re: Quad 303 restoration
Post by: mygoggie on January 02, 2019, 07:09:14 PM
But...why not fit a neon lamp..its easier?

I am looking into this https://za.rs-online.com/web/p/products/6559413/ but the 95K 9.6w (closest is 100K and 10W) resistor to be used with this neon lamp is expensive.

I had a look at the wiring diagram and I need to get the fuzziness out of my brain and calculate the voltage the lamp is to operate on irrespective of the voltage selector setting.

More later...
Title: Quad 303 restoration - Faceplate
Post by: mygoggie on January 02, 2019, 07:16:19 PM
Jumping a bit around on the progress. Found someone to reprint me the faceplate once I have cleaned it.

@HB let me know if you want your's done as well.

Here is the existing rusted one scanned in B&W so that I can get the new artwork matched 100%.

(https://lh3.googleusercontent.com/WXNgvTuNCvE2YZq1lbtzC_oIum9nhhz2AF16vg9JgU7nAj2JnR3ZLohqX4jJuwmm55dKUbTF2aLXymvzXHZHBN-mK-77irm_2ZpoQJo0VvZ42zttsOW37rc5ooNGlLx4OYw_BDwL1NcEQGl1Rev4KkNBhYzfoVcKVFiw68L5TyTaJO6rN8KqBIZLhjOAVqY1Pxl8XQKus8YyZE0YHqAN6dozF5ovDQw1VO3s0EJy5jBO14LuLeJgYi3bW85t70a2wWgwICz7uZiGroSHN2wqFdOrpOGae8SvbH1k1mFQ9ZKd2kKp9DI_s6dSo2lYbey4GlETQIGLpzshu5GIcb-GpbI_Wfg8dDKmUv-eg0dE7r0BQz8xkkm7N1tOSqhNnCSxQ-Fx67a-oG9C-HkrgXOnjETVQ3_wwLjjqxkNrJod_OeDrDl-07uOBcJ9tdRZLgCZjHew-oGS7FhVahGHBqtkle904Lr-a2ypFrlfavrdJldnIKVrHLYqHPVb4U_Hckc9KGFwp5exXuan5K-Qt7yMvuxEhApyAAK7ufvISfIDqVIdKEh7CCPTgP15pVFHV1vsV0YiSylj9VMagwuRuAAqHoyvCahqbrmFjytc7CQYaTzoSSTCNJ7Xd7gSxGJx3M6UGrPQtvEqWEAsNfOvtsYnQfyAMVOOTFsO_zm3P0Z7eOsqXtCzeaxGQ5RHiTgQ7mO_RqIRU2bWfmdr8V-atg=w786-h1024-no)
Title: Quad 303 restoration - Mains voltage selection
Post by: mygoggie on January 03, 2019, 10:21:46 AM
Being in bed ( :sd: :be: ) allows me some time to do things I normally do not have the time for. So, I decided to determine the potential difference across the points to which the original neon lamp is connected.

This required that I work out how the main voltage selector is wired and how the primary side of the main transformer has been designed. I found that it uses two separate primary coils each with one tap. These are then either connected in parallel or series depending on the mains voltage. The image below explains this quite nicely. A very simple solution to what could easily become a complicated engineering exercise.

At the end of the day the answer is that the neon lamp connects to 120VAC via the 100kΩ resistor. I (or hopefully one of you) should now be able to determine the specifications of the neon lamp.

(https://lh3.googleusercontent.com/_tsloRmSVm21V9K9-y2r9i7qA92ghPJ5YLfoSpyQPrMoeGZd70pywrOuXU_Dt1m6wUtLr44IerDiPUk2Ba2w_Wy-GM4zgmgJ-b1L-8k8GsfJFD8IOC1lp1ucJ2VnkmqfwSYUlSLNTdVsa9C8gBw-dk5DBq6yJpwCJdr786pzRyENbThWKmu1qNFr_91bH548cWISu0ZEGRN7BaeadSxhIwNs-04Q-bwtZi7NbGrMie4w0SDVbiXwIQ7gpFHthYC-XPAfO5kYecxsZEHxwUpJY9qXH5HRCHHy8JxIjAzp8gBIih5L9Cmpdsm04Lrdg_XagFctga8nPPz8_6mKdohH17ATOnxs_KkG00Vwi6g3fzVYIHT89w4b1WOJHVYRHFUCOrgNPXSy1o3AJGeX4hIpx_IjAEPVD6I601NjYiiATuvcP1LIFFbVjzujqDoaQ-qnxhlrOEFzYlHuuORZvjPP967a-cMn13s9MxXeRDXavaluIV6PZ5pki6Xq5pml1T724_Pkxq5kQZB5bcPTXTTIVmty_CykbZd8pI18neG0MZcSsJ1aYLmp0mpbbwGYVDZJPIrtOWQaqHn8KbGy3AhBegsbYSvcmb3Wy0Ex3FYSmEnDtg9J4s7oskkAlr2xG6dFeX7R3W0o7Vd48-MyWl3V6iIgkTqAreCHPClieNkE7jKUje2hTuenQbrvpfXysGQjnKHgLZK8_P_IktBP-g=w1079-h560-no)
Title: Re: Quad 303 restoration - Mains voltage selection
Post by: mygoggie on January 03, 2019, 10:51:06 AM
I (or hopefully one of you) should now be able to determine the specifications of the neon lamp.

So a quick calculation using:

Resistor (in Ohms) = (Vp (power supply voltage in Volts) - Vn (neon lamp voltage in Volts))/I (neon lamp current in Amps)

gives me the following:
I = 0,3mA
Vn = 90VAC

This is your garden species variety neon lamp. So now let's find one of these matching the measured dimensions of the old one which are:
Diameter = 5,6mm (0.22")
Length = 18mm (0,708")

I see the standard size will be diameter of 0.244" and length 0.750" which is in the correct order.
Title: Re: Quad 303 restoration
Post by: HB on January 03, 2019, 11:20:54 AM
^^^ I think I have these. Will check and revert.

The face plates on mine are still perfect so won't be needing that.  :thumbs:
Title: Re: Quad 303 restoration
Post by: mygoggie on January 03, 2019, 01:22:21 PM
^^^ I think I have these. Will check and revert.

The face plates on mine are still perfect so won't be needing that.  :thumbs:

 :cool: @HB that will be fantastic. It would be great if you can maybe let me know manufacturer and part number so that I can add it the parts list for others to use ... nudge nudge, wink wink  :giggle:
Title: Re: Quad 303 restoration
Post by: HB on January 03, 2019, 01:34:15 PM
I'll check when I get home. Mmm thinking now they're not packaged. 
I'll  check.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 03, 2019, 08:09:12 PM
I thought today would be a good day to see if I can clean up the rusty power transistors. I decided to take the one that was severely corroded and see what I can achieve. So out came the one marked in yellow below.

(https://lh3.googleusercontent.com/2sp6MTrMaojVNCpkfb6dRo9Wy5cWVXLA0Bc319YP8Ny5HQCfrzXXnsMoiHetL6wLdqwfPE8DeatxbYWuV3QwoScX6x-biXQBihjgAWYbnHi7xqSanVvK5fml-zjMgS2_bI5dgblj8p7bV_pVwEtefZX3VpJsz8msiBCmRW0TZpqrro6Gwol8FwR10afb3q2el1xmjhGhhOfl730M1RPyx_mPQrmwJO-nw3fGmSR3hc4sw3pueMmJU9GmgLhQTMgQQs9d2LgSuZlQZh0bK7rCosRNK_iZI7w0iS2sCKkuTx79Zl59eZzz6tiVUZhtuqlC2V4DDdIUKmRqjIIFRRDPeuqqb3hssFiK162xNPx6s1FpKA0SmaFMhf1pUGqFSwiOLzikGC5JLHm3UzV1qYYkpmnnAR6iOLz8CCtkz_Q4DfbDb-_m3IjNJYpmUK0SdetVYQPr5-IBlnxVUDnph6rlEJzjgtonrzkXtlkmFSlJpkT-g3lleXgMzCDxJmTdOM5xgg3h1uKdhZAHRcgrTNeb3uauFOCrENDv_p87eMQOYbvzc6gqeRxkkyiAlRX4tIbZKkP97mYtVDmnP63WiL00TbrR1SlQWNTgSGc4o6siYOHu5vvsHxCgYdf6OEjrB6bb50_VmUqmC7mtPxXCa50VXCeYzJ0lrsNewHaNeHlPmogU_ee6_DIyzZdPhb0wM4yvqEo66CUmiY9W_slzDg=w823-h345-no)



I decided to soak it in a mix of citric and phosphoric acid as this is how I normally derust all my old rusty rescued woodworking hand tools. I just covered the bottom of the little bowl and put the transistor into the acid.

(https://lh3.googleusercontent.com/QAKjabMNrB82QHVffLZ_HW-ii3al_TojGNCn3mMBVzp1dnwamPznRHNoXWF7to94aZMpSs3jei_-kIxSLJw50Qh7ECSIBzxgJrdLc92pU3alT_erVbiVxqfQ2NV9Kk-y9U7adNbWfAZaZiWv_sNUgfqYZT_9Ji72jooxFuOJj4U-tmyRpo4GDk01_Go6EpLm5XZ2tchxudtNPodKIVMWmLF4bRLrNZYKx2uGGt8LBhC5OljyJ7LaLRjofYRqQLdlvhhhecQdS9k0ec9oo-8Q69yAK4hi-INy_iAv4YmNs1ZWiSs05GYrsrsPk8NFIhcuEdlMVBY4_iAtArnjUIlq4M2PfvHX7mYnL09EB36xqUPu02VXlOOBLDlTgZNryU2b2IpLfusTLPPKnhcPLmkjr7Be6MB17Ue9mspod4YDTotSJcGDfc3ALKi86SOjanm6Q-NBspv53OT7QOL7Fp2BacWGibX62URO1L-m0NyUgxZdhJZimcCsfv7BaIzR3B-0JyTB7FU6GLNuvH43uaJTRqAosEXStpkz5ic5PpciH_dpDGyo_RXjZI7MEDo8d7udVM19bbDCU86PtYOF-_vxYVFsuuLXCEy9MZWTClkj_JUGVgM_9XOC4owWmJuBSDGEBGBN4hiFa5GfZ7ax4G68AtkQvCnMqtYkcsXEKUhDZko-YY9lzzhUUrKz_bFmG5v7ZGe3yE0UXk81Ilrmvg=w1152-h1534-no)



After 1 hour it did not look like much, but I could start seeing progress.

(https://lh3.googleusercontent.com/phtYjQWqUCH8KbzPkO2051bp97K4v6ejy6Rj6OIdPg_VPBWSg72qiWwKU2wKCJHgSAusa4fbDMQl8rtRAU7xoVklDS8ziaI5xYiTweBEUsyB6EIpHq2_2N_qKp-TK4TCdnKaFfInvpB6nhJlr21W4mP2cW08ZD84n24boO9bYqWl4xvqQWhfou2fW23u34O805qOH0zgiUdevSZX3_VbptpXEVlpknZtc15jMSX300bX5A4Tyhak15Y5mWW-alsG2sCJ-_6ijF9OIKQFYegH_3ZFOjDb6EHvhsiRl1nAVvkKKuMQLRkQUjDOMSeNb1DuqqiE-UbeDsq3r679uDgbu4agK5wzWpvgqhKKpuwUKl-VlXxU2fG1XkCiXYK2FoeaKdhni-g4zTc3m5c0gjHyEzt4P0sumuyFrco-WPDg-OK4AALNo90_HBvLNNySgyZVf2y-e7NJ7igtnZ5mt-PvcK_w9Kyd6mIHVqIfrqQtXCrj4zKSDSFUMyONv6kg381Iuub8ch8S5KrKXJQgEY7GCIsTbjpboa5y5Vo5scJ0kEj8mrRD7klhNQ3zuvuLbeHjBZsYx-V45taaSp5-kyUVw1RnznFZxPEScnmGnsPtNAkLQ0payN9URojSFj8yZT6ABp2IF7otz9-KhhCXyl0J9DU57LKBhuTC3WOvF9NvuWo8LJ8-SW4CJSun0sOqMepqh8FkgzHpd98VqiJbGg=w1152-h1534-no)



After 5 hours the rust was converted and I could start cleaning up. A simple wipe with a BiCarb soaked cloth and she already looks a whole lot better!

(https://lh3.googleusercontent.com/QsR_8UGJMmpGMlXO9YqADPCclE4Vf3x_Yp4T-hw0-cGmTbixKK_osr_wIqmcZHkwM-ivYvgOkEkuSoP-3mZ_d61TrvHFtB6C4fHAGmDv_JuglFVuPc3cZAKwX6p9SHMhJ80RG6GFvTfch3crwtrf3W5WVmhPt2rxgpD2jzMw7eGAQqqCOdwsdpaNZ38MCPjeWBZuT7BehmE9eLuZ0P7bx8jvYwszL5e1zGrQ99rNPMpXTdJ3h5vhClV0y56RPCRh_c82cXnoZ46NuRuU6b59t7Pw6ia5DUzzhLLp38cDiJbIbvtLqlfd729gWNtO8vyYDOluInIyGwjndk63gFn8EgjmJV_CjKR7sZeRa0FnP-_zGrwhf2lDio2He_XSYRKoSXvbY0Es3l04vQ_yZup2hQzSPPCGS5o-xiLaiPzk0WnF1fTOtWschLPQNEvzubJo7YJK42JTEY65PAFV11PkYmh_qk3ZZYdVL-7b1gI6vmszU4PiNkP2HYqA_2XI7kiHu15NUyd8m7pa_FSZNxTNLI4v33RQ55P44CqYXsZ7ibIceMIzn0i8LUszCbBAtx76qAdi8BOv_4YwMlY2U3RJAcHB-MobJywG20MhHJ7oz6t-5wPsA2uqArzsZgZXwd_JNs7vBQlx1CnEbAaxj5VP9GaRi1ODwT8w7gc8_1g4smjd5Cnn6_yQYsNeKZ5Ig9nVwoCsu3wi1QpxmaEEWA=w1152-h1534-no)


First cleanup was with the wire brush and then I moved onto the buffing wheel. Finished it off with some liquid polish. Very shiny with a few black converted rust marks, but for me this tells a story of 50 years. I tested it without load and it appears fine. No shorting and diode function works. Will do the rest tomorrow when I have some strength again. From a rusty old piece of metal to a "working" power transistor.

(https://lh3.googleusercontent.com/VLaGTVIUVSojzhtoC_M-12ewVsr28fRlFdvOjkDsJy4PoApawPwASTzvwB3NMoX7l2iND2sPngVKSrp0-P4ZpxuQfW557pDAVy2Pnt6EG8_mSgCa2Sa29SzwwY85lzWlx2wg48veHShcaqOFyRQqnZIw-T8sDhh5eubq35ZTn15XfU9Wjclk4bHPMOkETm_lX4mEKBTeK2BPxM2x6wRjo5bLmYTmXBdqaZKqURxAA8WAiqw9G6UHgF0Jq7FMGn1YlUhj11AOKTbHMLRBoPkXUo7IiCgqeQ3ScDe17NdqQL5Bi4uehePcMTQm1Vh0dvbTIPsAslPDH_HtTZSN6rNjAChPDE3DgMWzXAMGyipX-9Lp9XWrDpV2cvAPTT-aUDHZiVhL_fdkqMfMRVUA6fCuxtddNssUeG6bPbMImCbBCZJ70uXIFFa91qjtXff1pC1XYZbxudo8p7OLgpXs_Piq512w_Plo9ZttN-JzTauaKU6cano2ix1dQuInHWbYAzTHIcqEfiLb8CSwgpfL4gNoLkS0DutW3vVBm-BO8jaEurI2iRdYU3cR5sjKV3B3pN__HLKh4XnZMxXwUO_eaDlqGPk5Hg7sHenl0idmyxZysclca3WoHlepfJzmf8dlQiON2LF0wijQlZA58bsOMzRaQpbX35doN97rw3Qes5kMUpTY3atpIjl_XH-E_E79M58XulIj4M8dfRVV_AK9LQ=w702-h701-no)
Title: Re: Quad 303 restoration
Post by: Family_Dog on January 03, 2019, 08:17:57 PM
Good to hear the transistor is fine, I had a sneaky suspicion this would be the case.  :thumbs:


-F_D
Title: Re: Quad 303 restoration
Post by: pwatts on January 03, 2019, 09:40:16 PM
I changed the output transistors to MJ15003's on mine - much better and not a risk of oscillating like the faster MJ21194 or MJE3281.
Title: Re: Quad 303 restoration
Post by: HB on January 04, 2019, 11:19:37 AM
^^ Will MJ15024 work? I ask as the one I'm doing has them installed.

I also have plenty new 2N3055.
Title: Re: Quad 303 restoration
Post by: marantz123 on January 04, 2019, 12:54:11 PM
Please check the junction resistances and check the hfe as well. I have had low hfe and funny junction resistances even though diode test was acceptable.
Title: Re: Quad 303 restoration
Post by: marantz123 on January 04, 2019, 01:10:32 PM
I am looking into this https://za.rs-online.com/web/p/products/6559413/ but the 95K 9.6w (closest is 100K and 10W) resistor to be used with this neon lamp is expensive.

I had a look at the wiring diagram and I need to get the fuzziness out of my brain and calculate the voltage the lamp is to operate on irrespective of the voltage selector setting.

More later...

Pull a neon out of any old appliance, hairdryer, washing machine, wifes curling iron, iron, multiplug, kettle etc. Dont have to buy a new neon...these may be compatible.

Also dont understand your calculation, how did you arrive at a 10w resistor requirement for the chosen neon?

To run a universal pilot light/neon anywhere from 120v to 400v, a 460k to 1M Ohm MRS25 or PR01 metal film resistor in series with the neon should be fine.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 04, 2019, 01:58:17 PM
Also dont understand your calculation, how did you arrive at a 10w resistor requirement for the chosen neon?
Specified as per the manufacturer datasheet ...

I found the correct neon indicator lamp that will be a simple drop-in replacement:
Manufacturer: VCC
Product code: A2B
Title: Re: Quad 303 restoration
Post by: HB on January 04, 2019, 02:07:31 PM
^^ I have plenty. No specs though. I also thought most any would do. Physically they fit perfectly.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 04, 2019, 07:12:13 PM
Please check the junction resistances and check the hfe as well. I have had low hfe and funny junction resistances even though diode test was acceptable.

I was planning on doing that early today, but I did not even have energy to sleep. I found some energy late this afternoon. Here are the values:

(https://lh3.googleusercontent.com/5Qk3c1Mx3ddpJd8qpUe6wKoyTFDEH4oDgbysz3XWcIBbGLYlxVBVJqdKT1KiDjuQZoKdUKlMg6P1YKDe9Xwo568DXbE7wK4w6BWx413h3KDEGXGH0D8GtEVJyj7jrLHVI91dqGARNWxhghCMFIbYP_Q5h3dr9TV2ZZte7cgaT42RHpPiSlWLBwg-Ax9ZW4QbGnqRHQ68bBChLo-ziAN65Yma0CBoTjDLo9sc-mr97jMUA0EJ8GPQO1LzD_mi-BM2BB_vNyWdkgf8nIo654qioELlpD6-gavLpNnI1tmX-_Mhp8wtfEPY61wsd2NEL74LhEBMMaEfkmfvBhVRkg4M1QoyAR9EZxaAnkHzk26allf0h1iNpAA47rxlQwwfjcFB7ACdHry7MHJ7pTg86UN-LXdp1-H2HTsR6RNPP2d1ZECVKtRcFwBgHeaddZICsUlSphePbAj1P1c0wacm6joOOr1qh1WOSe6cgfgicRKn0DjyhUkkrpalUBGKibQ_0STtH1rSO30FWqXSPEJUKYnIkyWDJWti112gGeayP4qZN8UvlwwWkgM6dZAKmYG4gHv13KB8nXixHAZZWDddwYAr2Y2ceUSB6IMcWK-LzxDUbHPSTxyK4goqF9jJT5M3vyHX5g-P7cDCeSO4bLtYAxA5Sp5htjgHzUXkNKve9MpYzy_uc_Vux4pLBGqSiLMMIsOQRAQs4laUzuMFxSaD1A=w831-h170-no)

In my opinion cleaning these are a waste of time as electronically they are shot. Will replace them with MJ15003G transistors.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 04, 2019, 07:31:41 PM
^^ Will MJ15024 work? I ask as the one I'm doing has them installed.

I did a compare on Mouser and the only real difference is the Gain Bandwith. For the MJ15024 it is 4MHz, the MJ15003G it is 2MHz and for the old 2N3055 it was 2.5MHz. How this will affect the frequency response of the amp I have no idea.
Title: Re: Quad 303 restoration
Post by: HB on January 04, 2019, 07:44:33 PM
Thanks. I'll do some more research. The 3055 seems to be somewhat controversial. Maybe I'll err on the side of caution. I tested the 15024's and  they were all buggered. Unusual for all to be faulty. I'll  have to bumble around and try to figure out why.
Thanks for the info  :thumbs:
Title: Re: Quad 303 restoration
Post by: mygoggie on January 04, 2019, 08:07:14 PM
Thanks. I'll do some more research. The 3055 seems to be somewhat controversial. Maybe I'll err on the side of caution. I tested the 15024's and  they were all buggered. Unusual for all to be faulty. I'll  have to bumble around and try to figure out why.
Thanks for the info  :thumbs:

Yes, the new 3055 is not the same as the old slower 3055 anymore. Pull the datasheets of the trannies and compare the current charts. Quite a bit of difference, maybe you make sense out of it!
Title: Re: Quad 303 restoration
Post by: marantz123 on January 04, 2019, 10:46:14 PM
I was planning on doing that early today, but I did not even have energy to sleep. I found some energy late this afternoon. Here are the values:

(https://lh3.googleusercontent.com/5Qk3c1Mx3ddpJd8qpUe6wKoyTFDEH4oDgbysz3XWcIBbGLYlxVBVJqdKT1KiDjuQZoKdUKlMg6P1YKDe9Xwo568DXbE7wK4w6BWx413h3KDEGXGH0D8GtEVJyj7jrLHVI91dqGARNWxhghCMFIbYP_Q5h3dr9TV2ZZte7cgaT42RHpPiSlWLBwg-Ax9ZW4QbGnqRHQ68bBChLo-ziAN65Yma0CBoTjDLo9sc-mr97jMUA0EJ8GPQO1LzD_mi-BM2BB_vNyWdkgf8nIo654qioELlpD6-gavLpNnI1tmX-_Mhp8wtfEPY61wsd2NEL74LhEBMMaEfkmfvBhVRkg4M1QoyAR9EZxaAnkHzk26allf0h1iNpAA47rxlQwwfjcFB7ACdHry7MHJ7pTg86UN-LXdp1-H2HTsR6RNPP2d1ZECVKtRcFwBgHeaddZICsUlSphePbAj1P1c0wacm6joOOr1qh1WOSe6cgfgicRKn0DjyhUkkrpalUBGKibQ_0STtH1rSO30FWqXSPEJUKYnIkyWDJWti112gGeayP4qZN8UvlwwWkgM6dZAKmYG4gHv13KB8nXixHAZZWDddwYAr2Y2ceUSB6IMcWK-LzxDUbHPSTxyK4goqF9jJT5M3vyHX5g-P7cDCeSO4bLtYAxA5Sp5htjgHzUXkNKve9MpYzy_uc_Vux4pLBGqSiLMMIsOQRAQs4laUzuMFxSaD1A=w831-h170-no)

In my opinion cleaning these are a waste of time as electronically they are shot. Will replace them with MJ15003G transistors.

Your diode tests look ok (4wd volt drop),. The b-e /b-c junction resistance combinations are questionable. The c-e switched resistance, I assume those results are without anything connected to the base, ..if thats the case then it should be open resistance if good, but all these junctions have conductivity. ...which is questionable.  Small signal characteristics hfe should be within a decent margin......some measure strangely here.  Given this situation, I would pull the transistors/diodes in the driver stages (use heat shunts to protect the these components when desoldering) and check those in reverse bias as well.  With all these pulled, then compare resistances (between channels)  across the cct at various points for anything irregular. Dont leave any stone unturned..if theres problems, your new power transistors can blow. I suggest putting some current limiting resistors in the collector lines and starting up with a dim-bulb tester when you are ready for switch-on and setup meters to measure biasing before/at switch on.  Shouldn't have problems finding 3MhZ TO3 packages...theres plenty to choose from.  Good luck and well done thus far !!  :thumbs:
Title: Re: Quad 303 restoration
Post by: mygoggie on January 05, 2019, 09:08:06 AM
The c-e switched resistance, I assume those results are without anything connected to the base, ..if thats the case then it should be open resistance if good, but all these junctions have conductivity. ...which is questionable.

These values were measured by connecting the base to the collector and using the multimeter's internal voltage to switch the transistor. A simple test to check if the transistor is switching. I found a nice video showing this trick - https://www.youtube.com/watch?v=qnVGwfc8CB4

As you suggested I am going to check each component on the boards as something is not right. Part of the fun of restoration.

One thing I thought of last night is that all four TR1 and TR2's had a mica insulation tab with white heat transfer paste on both interfaces. Tr3 had no insulation tab and no heat transfer paste. IMHO this is not correct as mica is a thermal insulator (remember those old oven windows!) and secondly Tr3 should have been insulated.
I will get new thermal conductive insulators with the new power transistors as a first step.

@HB maybe this is the case with your failed power transistor setup as well?
Title: Re: Quad 303 restoration
Post by: HB on January 05, 2019, 09:45:39 AM
That is exactly the case here too. In fact, two of those insulators crumbled when I removed them.
However I'm not convinced and will do a thorough   component check.
 Still learning here and having fun too.


Thanks for letting me sidejack your thread.  :dop:
Title: Re: Quad 303 restoration
Post by: Moolz on January 05, 2019, 11:41:13 AM
Love these sort of threads!
Keep up the good work and keep the posts coming up...
Title: Quad 303 restoration - Regulator board
Post by: mygoggie on January 05, 2019, 01:13:22 PM
So I am working on the component list and started drilling down to what is cooking (or had been cooked) on the PCBs.

Today it is the turn of the Regulator board.

As per this extract from the Quad 33-3-3 service supplement manual, the three transistors, TR3, TR201 and TR200 work together.

(https://lh3.googleusercontent.com/7Kf5YrP5uHmzJ-VkfF7OHOZutkJL3GuMj7Xws2Oxrym8h7AX2aFJj7mUnHwpFsST357jc8r3YNrQllw8bDLj1rK2R316fecZIZQ5QH3YFxehIp0fQRXDgp5iUZzWxJwtdbm6sCmLaffNCmRSmnvH-ijAK7npgXgbthYl67CIcqWjD6sLylpoB9_K34CmPpNt2wPQJD-BSl9EsVkx46zMkTsUk9GBahuswzhDrf-5k__yzlPFi6m-0eWmo0nf73oCBNWO_JzrZyqKK32SkuXy0R_hhOfD8ysB2Yfb4Wn7doC0T2zZlzTdPLVfxrXPlgc2oKCC5FQ4zDM4SAjAfpIdNGEot_Fx1H_Lbe-pEIh-t7k_oMPd50TWgpcYCVRtrmo5f7F4ZaEI_qOp48M0xRVj45al5LXxbqzNhvgyRojDAGSKFoLc2ZkSaE6qA-laAZEMKbsnyCPPg7aSE0lv0ivNtgwpAR9f04NUhbqHeBxyEKqoiBqZO9Fb1SPWq1FSocqofjJ68YVApFzHuYjo-T446ZFLdwuPrsUS8xmZcs3oLBzRzUrUzXz5GRJS0jg3sOsSbHqH_F2SKZRZVw0WSBW5mkHZaBsI4Hg296T2qsb9ArGeLUhO2G-zQAod3RgQxu3Q-54YXe8ZLfyjRQFfMVvXOSB-GmaUwh93-rCm5_ixWzEcdRfqxILDSARfgr1KU1Uo7BBnd3GmCNW8sz-0TQ=w840-h422-no)

As per this www site (http://www.richardbrice.net/quad33&303.htm) the regulator works as follows and I quote:

Quote
Power Supply Regulator
Another feature of the Quad 303 circuit is the voltage stabilisation stage. Various designers have different opinions on the necessity of voltage regulation in a class-B amplifier. On the positive side, voltage stabilisation will ensure hum-free operation under all conditions, on the negative side, stabilisation will always limit current demands and therefore limit an amplifier's ability to deliver transient, peak signals. The Quad designers clearly "sat in the first camp", the 67V single, rail being derived from the reservoir capacitors C2 and C3 via the voltage regulator formed by Tr 200, 201 and Tr3. The regulation stage is common to both channels.

Innovatively, Quad chose to regulate, not the positive rail but the "earthy" end of the reservoir capacitors. This has the benefit of reducing the collector voltage of Tr3, thereby ensuring that the whole circuit is less "fraught" than if the series regulator transistor was in the HT rail. The regulator action is achieved by deriving a control voltage on the base of Tr201 (which is the first transistor in the Darlington-pair formed by Tr201 and Tr3), from the comparator stage formed by Tr200 which has a reference voltage (with respect to earth) at its base and a voltage derived from the unregulated positive supply at its base. As the positive, 67V power-rail rises with respect to earth (the anode end of MR201), Tr200 starts to turn-off, raising the voltage on R205 which is "followed" by Tr201 and Tr3 which rises the voltage on the "earthy" end of the reservoir capacitors, thereby reducing the voltage difference between the two rails and effectively reducing the positive rail voltage with respect to earth.


The original specifications of these transistors were:
Tr3 - RCA 16012 or 40411
Tr200 - SGS U17229 or as per the service manual to be replaced by ZTX504 to be replaced with BC556B which we touched on in this thread (https://www.avforums.co.za/index.php/topic,75827.msg890525.html#msg890525).
Tr201 - RCA 38495


As you can see in the post above (https://www.avforums.co.za/index.php/topic,76695.msg898987.html#msg898987), the power transistor Tr3 and transistors Tr200 and Tr201 on the regulator board have both been replaced.

The currently installed transistors are now:
Tr3 - 2N3773
Tr200 - SGS26824
Tr201 - B???? - Too corroded to read

In view of the facts that firstly I am replacing Tr3 with a MJ15003G, and the current Tr200 and Tr201 are very badly corroded and will have to be replaced, I need your help. Can someone with design knowledge please give it a think and let me know what would be the correct specifications of Tr200 and Tr201?

Here is the circuit diagram with the required rail voltage of 67V DC and an input voltage of around 80-84V DC

(https://lh3.googleusercontent.com/k55V8BrwIVoHaiP75R9jiafJ2tiOj1qhGgef6yJhB-OJ__YJw9mkUFoFPivpE6HAGAoTPCZt5M242wkvYNvOdBMd9RJYlbyRiBDXEqACjDyNeiFKwcq7YTDHSCPwfRfD51qDeziQEW2_NcfmAglxL9XB5blafLJpEuKEF59ED1QGXDukIhTnvGaxM6jYRuSoca9WYXG-MhY8aga7_Ja51qRTZk12lWpXC19S63blzyfOKERe7XGdOC4aKKg-LgGSiuA0FfebReQQs1RFb62KC9OlXteW1PghEe_7fwoTHLz6d6tEn6V3ha-VTBhPV0zHs76An-SOGWEZMGk7zjvIZ_BLZq133C4yAdWR-6c04saKtbgvhX3sX2VabYaVsCdz9fn-Ty5oNflNCUNXn-i4kfufXMgiSUPXoQSHjXdPQwRIx1ZllxYfhihK9yc0GR5ZVT9LSDRUO_bobIeK7fgCaEolGkXHkP7E073F4s3Ew-l2o1QCCIQ8N7vZKKbNsx3Fx3uXJZfWcG14ExkdG58nkdur7k_s4dOw87bu3wxFaXs0wcQcwaiJKYTFzwsxUpBO0axiC5Nycy_kH1GQ9tRxgRDu1H4MGQWwVcEbl8HpFvvI-xTj6ai4rQ5vafF0L_dVyaPr2E9FG0MTOmuE68kDXqBJozqrOA7iigc1ZC26nuiGU-4IISMcQG4NRnJ3Bm8_T4opPU9OZk2RKB1cNg=w823-h634-no)

Title: Re: Quad 303 restoration
Post by: mygoggie on January 05, 2019, 03:48:03 PM
I forgot to load the picture with the regulator board component values as per the service manual. Here it is:

(https://lh3.googleusercontent.com/UsmGtV0zGJt-0gNWq2TCe_TTbwGmfSfBPPejuoIPNJrpcHCBngRr9eMPTaolhshUOczSWb5D3xnfI7z3tpZkrEqar3HDw0V3pCGH41-aSfHOtKe_FdtbcuwSn2Yci3H0Y3alWI35IcUxx6eNm5Npa6IBGLGob3DXXfS5TqsoE57TkJwc4FwezexcLVxwUUtPrCvJeBY35ghbC-chxhDGRQAZ7IM4UgF2_slOgdEBlORolNmGMNcz2O5jlFaahoUQcvK-9CDCEcrtdMNDTOcgechyA7wL9H5qA-gSAL4fhvyBGcruSvWEqwRufbsVlkDjrKpXXabU2nlFclr_PTQLCw6rvR3xqpN28vZ58270dRIqwo8Acbmn--lNuogAiXya5bwtwF2em-pXIQirf89oaWDlVtwMpbYu3Vc1V-U6CCuEdO1M-0_OhXMD_oQ6TYbAT5C7xxHIxz9ZWj59KqLjatDS-KXAiQ03ydqeYDcGHH0cw7MWxs_t4qyO7_jR9_ZkQhwXLiFvldRwyVvyyImiacNadA2CLcxpLtMhN_hSM0CIP3FUB6sgJI1OmTzaYMC6GnW9vGqqhprUrth1kSLZxJXrUMWODJl_8wYHT-M_FIjFNXL1A5gRSJSNV7dXyGUqwshOBWlKrl4ZKyq9Cwk0P79qdeRReyRd5GLuTapVSxgJppmVYynFrQwdfUM3x6__kN0aVHsFke3rNNUrZA=w1128-h890-no)
Title: Quad 303 restoration - Regulator board
Post by: mygoggie on January 05, 2019, 04:45:11 PM
We have a saying in my profession and that is "Never ever assume".

So I decided to following the wisdom of this saying and inspect and remove the components of the regulator board.

From a visual inspection I could see a few broken components. How on earth to you shear a capacitor through in that position? Things do not look too good as you can see from the inspection notes in pencil.

(https://lh3.googleusercontent.com/A32hp9gMWozgAXQDcTcXaAzCwMNzlvBdBVFl5KwkfeoWoVqTTmcivT6T33bcUihvlG0LPobFt82-ZcpEN2bxLQT3ODpwnPMannZv7tZrN7GNiDsA38-FvZf5itPf2juqsAAJC6G2o3dCAaefGFMrrxcCG1YmbPi97_62Pa-3V8ZQ1BPe_Aa6nk6yFRDkWJKmMSOzxRPdLWNiQU1mAJ1FowDfOW5QQ459x4YC0tr_zsVnx8qcyN98OJyBVmwTdqAfWGDTgo12s6MNCxAHGZkz7lc06TwbpnWSpOQkXHUFEjS1H6Hvmugmj6388o_V7_B7Md8RRhKZhU4g58yg2ik-DJDvEaM6ooJFSp5bworHf8C1mrimBE6QyrT62C7BQJ2b82kdlj8UdedICVNGyqVdxDphvsJveQzL7MtmghpBaIX7XSxkdglCiYv6duo_ZwjOexPOxsebXza7j50Nl1a8cwm9HLsxzsJdgQw1beQYX0Z84QL_nCR5vVaciaLv1f8ds7EO599OC7d1dGvF98CQ9P1c_g_H78VlQBcFazS7GcFivJrDm8HtjQ9W0FlfTv7x0aKjRj2bJiJ8ecEibBl6tpSm4AI1T4awFeahJ0Cnu0Xg-0zRz9zaAW7jNEQkOv9OHzyHhR4-s86SsgIohTcf0mzYgji0z3SLhQN2Xzu62991BNDIKITop9g-_zHxWETcFnG20Hsg1KDYwTAfMw=w1152-h1534-no)


Next step was to desolder all the components and measure each. Why can people not resist the temptation to add solder to all the joints when they replace a single component? I removed a lot of too many muchness of solder ...

Onto measuring each component. As can be see most components are way off spec (in blue pen) or not working at all ... sigh. Both rectifier diodes allows flow in both directions.  :nono:

(https://lh3.googleusercontent.com/AzhVyvX-tTDysbXwmNNlWSJsn7qb5eqrzpa5JqFh3z6wm86-BzSkLB5tawXdqwPCaZhGeZdxnxL2iS7UDQA3KPAW6JsMBM3jinUnX2HFZCzBDenpNPVSWbciap0XY7SnG0H2gAbEBuYeev40x9h8lpRlb8KFm6Eo0TmwKo-L25roJpFlHel6JpgUNrjjLiz5g309pULCBnKV7b0JfldjVBWq0CyySqZvnAkX2IhEGjpwEUus_rQTbZvnaQC0JFacsFZV382sAs0I_2TgUV3bwpXAZYhdj_e32Omu6lkrC855GGLSW91B_z7QnJ3pt2wcKYw4VZa-MaGr2azmiODuw6ofsbIa-CeNlQ1AW_XbdDwmabU53LT4U5UNcqUX_itfM_PlrLpzo6zo4RvPL56HGOZixg7xbtt2tuD_TP7447oqdQ1hzu4u0aq6JDgP7pNu3Zk69NnydjRWExp4IOGnYxFq_DqnImpJty8hoibqfDnut_ngEPkMnZknDMvwc8Z8FvwIYAY0sFi3mAt7dORY8K5laI9KOlevYODRwP2I0rxF9mk1iUcnt74TBJwq3cEn8xIMSUsCPR2rG74VhBSHKRN9KeRI4lDtEEs2QjJNOLoxPtn6ZwGFJ_zTastfvYKfjtAmf21NRYgWyTRI4c9xGPSkKUhV_LO7X-PzF_cfGjXnfvazZgEjdY9wKuUs4qH77y5sN7_MRAeh-JMKAA=w2046-h1534-no)


The PCB is pretty shot as the wise guy who installed the replacement Tr201 pushed the heat sink onto resistor after soldering it onto the PCB. The result as anyone can guess is that the tracks on the underside looks like a wigwam.

Anyone out there with a replacement original PCB??

This project looks like one that is going to need a lot of patience and motivation ...  :dop: :dop: :dop:

Title: Quad 303 restoration - Paint
Post by: mygoggie on January 05, 2019, 06:11:40 PM
I tried to loosen the insulation plate stuck to the inside of the bottom plate by using acetone to dissolve the glue.
Next step is to take the  :flame: to the glue :rubhands:

So I used the heat gun and carefully heated the metal and then the insulation sheet. It came loose without much fuss except in the one corner. Will fix that when I glue it back.

(https://lh3.googleusercontent.com/SIIsXSI_hLHUfHISWh26hbGO1KJE-RhNWLXKfe1H4YCQgu6tTizqZrypE5S4s-oYnpeDlEIY_i1KoUqzihfF_6Qy742yqVDmZS7M5I-IjXQHAsAm9LIxpOk2V0Cah9NvuoGNGu6KYixJzMXwzNP1PCkBfawvQPdhqIG60XEh3_KQNhuuMk3YPii1B4uMIBE3f0kE5oxhTKzLVQM9MZISR74bF3WLxPgki2XxVneRKyE4H7cvjKE2LmQYwbLK-j_fKZCvCaJ7kBfrW8XO4fE2Dtc2f18Fu6zYcMIUa4oCg_cKgB9ON7MCTe9lfe5FHO0WER_EMmbJt03RsfGp0k6rr68FOSHKb6dJbLij_FVxlb_BqMqRqabtGSmLGH3oWC7RGy8rWslqm2vPzOeZ9UwVyst9cfOra7PRidH9qehEF6ZhM7R0nXniiIqLPQNEjze3NmPLyC8ci6KYSBi5Zum6Bb65fmud4I6ecFibLryGWckFXFp0ndA1yrg_jD8_u9eUuOgSglpOOl13rBYSZn3hmjl84wHcSApAQ8oCGmzV5qU9qXDamYmJXwU5uiQdKqMmQIgdiAv3Bi72-x4t7HzT0jaCoae01KnzSxvd9sa14tQIcPLCV2mYf98I56LtyDoI5BmsGpdPOvfSlQ9eirnJBFLiLVA_p0vViayh-zE5xZyBvH8MpBmy3u5swgo6ygM0tdU-huu0f4eBh8pDUQ=w2046-h1534-no)


I then took the insulation sheet to the cleaners and had it ironed.  :giggle:

There she is; some old age signs cannot be removed ... ai ai.

(https://lh3.googleusercontent.com/THK_w5TmW8779Pt6zERQspUSHx0R0yR2pHgAxCWUqzoMEZV5RDFK3MId-tox9VIMjIMDUemJesPhVObNSS3WPamo54m7Gyzmt7DYKNrIQc43SMGxd3c6rOZwpbaI-8VICYFeWo0vjMY_hbeyApkk0eSroIxQd4c9KTAmy_BiXR30bpP4PlzdVv274qaw2Iev-6HyAxO8T8XGaL-gM-pfuQKP8qUK8smlqBZvUCh3LIwKaZh3FIxqT6dEYic-9BkygTSbhhXgoaKeXsE91wfEiVNvlLe1z3Md9OsVr4FYPdG8iQomOT-XFI_oOjnj86QL_5ejYqcqOWSOlg9uUbM8Mf-eRKsItcS0rO96uNMT-M2m32m5av3kvq2ak-PIAgPb1oAxAq8a5m33s9BL_uQTtWNhZGMAogSV6o31FcMIjZi6dayvttaVfJci3CItulg3_ho-CABewQ7kwwCR_emfFfVYoM9qB6xDnERIR1SY0pglFQqD7oQEAGuHIjN1IHgtTNBTbfbt0IbYBKOHbgycWOTXzswAIBVtwYWrk5XvIxQksHj0WNKp2Sn3JU3yDCwHqo5Kv7zrHnUiEuXz2UZZ_fPre1Vasm6SfRzyrp64mo79K7PaXj-VzwbjP7HjEd5n26MLdViToLb_Kunp3TCOGCEJvJq9ps12Hs3-VloPkRflDrbYjaemN6HZtjIJfymAbAjsRCedHBonvhzurg=w2046-h1534-no)
Title: Quad 303 restoration - Driver boards
Post by: mygoggie on January 06, 2019, 12:10:28 PM
This morning I felt a bit better so I decided to bite the bit and run with checking out the driver boards.

Alas, things looked a lot worse that I expected. Most of the components of the first board were FUBAR or out of specification as you can see in the picture below. Once again the measured values in pencil and the specified value in blue pen. I did not bother to measure the second board.

(https://lh3.googleusercontent.com/z5hFy0Jhj6AeHMpbdr5SDap_i_RD5JT9jUFK982cTKp9tRltQW7oDLj31MEFg7TyiwDbtWjYMHyDkCs4pLPlWI_qftJhVM7Ux5uKsQCPqXsELDOYhHc6nYlJARzXjtKd18IOn40cPtHmqZxxs8jpjwgsGJg2yssUwR0eAL-OacFyi432TbYxyPcoTP2b9zO96RTbm7bLtH--ts2l4scVJICYHxxm7Zjf_Ltatgqq-ogoxBdew6V9T7leJ2yG62HsRrIH_6romT0Zzhwifz7p7yo1wHnQkvydixineYG3JlDBukI7P2osezBlM4eeiGHRboWm0kaQaRDphhwM5_qhMveRSO3_OT0QgrBBNWVUVG_WxJJwUakKHYskcI5LOJQXxXdk96EiG7MjFoWcJdnR-68UkHQ1yWKHNYMQAbb53Q48ZfBBmEQj40-Do2jojSco0FeCWbVjV1byCgWaIKThLBBl26ihsEIQobrtDN6UahoJ_OI66w_ggguA3NfrCIl5f4oVmM_ImL0CfTknpBGLRwL50Le9qwG4CwqyP8xwk8XdoE_yx4OPMPl13tf8xeJQQ-b2tZaTukq99RNydlsGxRyFGPayVoYcvawatFzPdalmuL-95cJq792iWrkWTTmgK9IdJO3_79O_3xpSocSEPW7bmbD2Nk6r_xH6IBh48_crhkTgeEhg93yZvPVWPpqdJYZhKKBXo6SWDWX9iQ=w1844-h1534-no)



Interesting that R112 was an order of 10 out so someone made a mistake in reading or checking values. Wonder how the amp worked with this wrong value resistor in place. Quite a few resistors have climbed in resistance due to old age and the capacitors were either reading zero or completely wrong values.

Of all the transistors only two were working on diode function. I did not bother to check anything further as it now became a replace exercise and not a find and restore process.

The tracks were lost or loose from the PCB in a few places so I decided to strip the board to get a reference image to use to design a new PCB. Here is the board just after being stripped.

(https://lh3.googleusercontent.com/-gR6tpCRRCGJmhT1C4hA3KEVnIGYL_0TsdVX7ADP2x5B8LO2SUveQmeGBN9nnt9JP0B_s9a-68n39oDrvhBJmGX79wtuW2Lj-57M4T_WxRwIQJNiPWLB_lHAu8NZONEDLCS1mSCQeik-CbFPRpgD0guXthRQ7dsqoIlZOadK7fk7XtLzXyHoc8svpMgCRUsi8jMm3FoyftcMWizDRHI5i0UQHi8a0-cOApNQnL24uNFdFLnK6Py12C35Us2VkzW0NhAt2GXmzh9B9QvqS21iQ_FG3ClXdirLet6PiqBKXlRxkktG3v8YUuE8a-i2CI7cTMdVYprX-ZwYwyT0WIgyJpAauOm6tagyPFq7BXJfAPTgMlwVAfYLXYZ1IrzCQDtV89SekwVvwR95sk9BimIobusFPOfh-1GtWRRs4yq3tkf3WGjmq2dRw1B1Gd6GexM07nKxXncgkke8wjwdQDpjP3s30fJ0v0ZVlwDtO9aEmyLEjSUOHwTh-qU_O5agqysBLNUwbU4oiu4zh2ebKughfWpsqqskvPGlh9TXDwigVKBm7RRcG_7FcN1iko15rOkwnHFLKyIjBi1ClTqBy_9ZsK1a03K2CvEXk3ho1dFKgvGZZEmtxELZUCXb8Cnskbvh56Cr87iVprAZ3f9wagu7Eds27PRs6HNDty2iLIHS7ZkvCvyPtSeo7n4_aRQbVofS3nzSOzK5D2Ww1g4S8A=w2046-h1534-no)



A basic cleanup and a scan and this is what I will work from.

(https://lh3.googleusercontent.com/zXC3gJ6wYSjmYsAHvzf8v5GtM0xASoFhCwNCO8IvSKfxZekr2q6D-OHH9PZ5geSqvHdDGLu_nqwYR4BLtsupLMPs9n3UwhnHjx-HR8efgh9MN5J6fcB6R1SY8iaGAGaYFFosqSQblSXFMCfVicEQGtLz64vzsk9KuHszYQM_TXG1BjTfGQcziu8U8YSz96R2UpU63ohkgK-NjHc_SLqxANgAV05XYr5Lzn6Rgn7lZXgcY6KnQas44Zv4qqh7Eq-9IU5RHvd3EHewORPbxCeBTxs4PM4Q-uEFYavXyLGub99-uxSe4w6vw7C7ha6m6CxgIglfJx6vNgLE--Jn82S12IFEXoyATP6F3b3q0V_YiTKYQ_Dkhi5b1I0xpfYc68US2aiZ43Qt1UZ5xSHlUjlijJoKordRhPTgcw6J13tPuBoQXjTREpGclrHM4o1ZAtdnJSQKfeEaMvCuA3YerSxm64BFF7UTtA9XhFmP9njSubMxlVd0WYaPNkf8bLpHxS5vu6AA3iu7Kx03o-c-aNC-NFeQcB_4ud4wtmRCMpL59H3AyOOdkEbdubxP3q5RhYOLMUcqNwRPTpBcsnIHxQO1B2qjcQHzr5jQ_No5qky5EeSzrT8dtFhYO4j-l1qguTvCti1Hm2H59gH8z0SihWK96LfeCayUtI26AInXNbBqgwddQgmYljby4KH9KYc2oaLyzqwNM4I7nNtQDCtnKA=w983-h1276-no)


If any of you knows of a simple PCB track building package or wish to donate your skills to redraw these two boards please let me know.  :mates:

Interesting project! I am learning a lot.

Title: Re: Quad 303 restoration
Post by: marantz123 on January 06, 2019, 04:33:47 PM
Measuring components in cct will in most cases read off different values than those marked..sorry i mention this but im not sure if u took these measurements in cct or out of cct. Semiconductors can read off funny values and resistors in parallel and series combinations, depending on lowest values can result in false in-cct measurements.
Compare the measurements(good that you made a note)  taken with the other amp board.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 06, 2019, 04:49:07 PM
Measuring components in cct will in most cases read off different values than those marked..sorry i mention this but im not sure if u took these measurements in cct or out of cct. Semiconductors can read off funny values and resistors in parallel and series combinations, depending on lowest values can result in false in-cct measurements.
Compare the measurements(good that you made a note)  taken with the other amp board.

OK, help me out - cct stands for?
Title: Re: Quad 303 restoration
Post by: mygoggie on January 06, 2019, 04:55:22 PM
OK, I see it stands for circuit. So I learn some more.

No, these were all measured after being desoldered, so the values are actual values.
Title: Re: Quad 303 restoration
Post by: Family_Dog on January 06, 2019, 06:15:22 PM
Must agree that some of those measurements appear very strange indeed, even for old components. I very seldom change old resistors, unless they have been badly abused, in which case their appearance shows this.


-F_D
Title: Re: Quad 303 restoration - Driver boards
Post by: mygoggie on January 06, 2019, 06:55:31 PM
Interesting that R112 was an order of 10 out so someone made a mistake in reading or checking values. Wonder how the amp worked with this wrong value resistor in place.

My bad, I wrote the comma in the wrong place. R112 actually does measure 39k if I remeasure.

For 50 year old components one should, I guess, expect the carbon resistor values to climb as this is a well documented fact. Would be interesting to see what values they are when running at temperature. To replace the resistors is a minor cost addition, which I think is the route to follow.

I think something went badly wrong somewhere with this amplifier in the last 50 years. I think I must check out the transformer before doing anything else.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 07, 2019, 11:26:33 AM
This morning was tough. I did have one of those nights where I had bad fever spells. So I am feeling a bit whoozy ATM.

Onto testing the transformer. I connected it up to my isolation transformer and measured the input voltage to the Quad transformer. That is strange I thought as it only measured 210VAC as you can see below.

(https://lh3.googleusercontent.com/LNpWRdwaNs95fyeEmy0DsGpbILF-ND3_2tPTD2QCj0CejQ5moraOLKSAyP86fhFtAxw_neoYMM-qGIn_2ejHfzOKQAYWLsKAAjTKvsGIxNk664TEgmLbuIdwQN8nWcFbdLjdFtVhjlrq7lJf_2bGapl21nmtl7d4eZvk1E39WPt-y_HdH3lFmkKEaAxX32ZWVR3zt6oHeSNvz7SlmuEUGSHS-hX5F1d7K6vExBZS4oowaVEvQLw1oy_vawWkBWr88XLPA0oj101pDHlFtEIuAxe_j9qXKUcbWJUZuEEK-wsbDnOa-h2E6QLJphNiLMpLET7sKE4kdUN-TRhTM_a6AjtJzM3ULmJQp3P_dJbPWDdSDCjRIX0K0gvVqf7lnERzAj-XE76-Yhils4efRo7iCMMN9CJTnsKfpwjgJ2FWKBm5gMB6I-DKml1xVOUPeQi-kT79Sjz0I6QyFMqrvntfHAmzo62E6oDACOjh_M-LuZ3YEHYOTcrk8ko5VBxC63tqY9gAxjQG8CDeEpdiF5jO2BkkaOZKIdn3fLfMi_QWUKVbLBOC_Z09w_EqKkJ3uTBCjt_JIMZD-T_ypnRiOy1qgIdxbOM-TDldCjJMrwDqa0iAcfkV75STuuL9y6xrWITv-0Pvz_etKJWaYbw3hppZta2NpvXhnOtjBhgOT03Pbk5Xxy6nbqqEJ38NLbJPn8o6BB_6XFszfuAXOb9iUA=w1152-h1534-no)



As I pondered on this the capacitor on the supply side exploded. Man did I get a fright!!

(https://lh3.googleusercontent.com/uUjt9x9e9ftNJ9nobNNr5PzC46A42m1-vFMEHqAGAY5OkbI-_raWJ8878FIngvnArDL-VJG1uiIn_Kydy5csOOi-ZeoVKtnQYQTZybuIxaKUQf6l2MPbKQsUJws-3sdVXQsaENsYHBDKS2qhvIkF-xIp2B-1dq8qDzqAqSLKNKCCsdKaY2GBkAG8j3iP_RrCJudndmLe3n_P2zD9wdrslZu3KB1S6u_LmnSZrOJOBifvNmDMp0kEXesFNU2WFogHfAJh90qezO14ltJN4oaM7x_HsrxOkK2A0lhVSsth_dsNxVvRsOvnw5INrGlBpH6eNCmGp3yP5eI_D8whhsnEenVTA4BhTLVHf1BgSyFQC4T8yox-DuYlJ4c600IVES5p8ZquLZ7Bht-wA2sLaQWQ4MZNj_lDualFVtXkhYMa5WDeRqF0NlVcqPxZC1Xj19jKWDKR5_vVcCIWBBg-0QRQGElkznoAVJbmzXnH70Dcwm8fpt8aGxW5lQQnUwHzDeqyF5xDHpsLF24qRL1yZuvjRobq84eNxpuRxI_TNn5SaUbzQDxGUbQLknoxcxAtYiwazy6tvA4Xwg_J2wFqnR84slIZPna-0Quy-Okiq5WzJZoKwCSeQCeuPoFzZdJvnu3_SDuJBfvBq-X5IH5WHVLkDoL1BHX2WgVHxbPErZ3Lchry80UBry4-Ay-NsIca5zu025C-VCh_kGJm0kGTfw=w2046-h1534-no)


Fortunately, no harm done to me and the isolation transformer did it's job. I checked the mains supply and it is 212VAC from the muni supply whereas it should be 230VAC. So it is a supply issue. Great.

I then desoldered the remains of the exploded capacitor and energised the transformer again. I checked the output of the transformer. Only 57VAC ...  :sweat: This is not good. It should be close to 65V if I understand the comments on the internet.

(https://lh3.googleusercontent.com/QMzOHizKNDtm445UC-gGLuNl8b0lO8CbqYQDBoU9fAJljvhE-_Oy98iAsEKPVOrWqIdG083gE_9oT3zo9-yca6aVfBNw-DbsrfUWbJJGQv35z4o7tlmDK8Tiz-TX2IF4btBhRqb-yaym2U_Nmo65WMOFkMmKxR7kVhB1z4ZdR5VIxGQTcYVvDo0Dzk31X3oWyvcbwbVPbfSb-_9QSEbTWDV-E0rf5D_kBRbwMF9bd6ZgNBHLpBtzRZphEPNg4kdkc5NeLVSAqQeyAFhYebita36OdoCmEic0VbPxAjhP-lFjrBxup2Z32iybaNlK0mveCoNKbbYqvMS2ecghXXsqqRm07R3PbK9QhHl6AnWXZBU8go7TRjjTgRYY6spgN09UGo-SNTnbiOYP7399LA_pzs9DjPxgB_zBCWrkZyXqCeUttSnSZfjxcSu1p4fk81dUdYqOFTlgCHphAiEtB0y170832PCg1QXQFQQL1C_gQR4j12sNt5JBWMP1DJF4KkYzLFUXKRlY1tErLUADdhAL4YTlwAT4vTXIDO8B9sWslK4sBp_q4hPtwZgK_Q0_h6EUjEokEjMa9GSotgwJGsEsc7BcjGT2x7t2FHpisitE1xSbMOJOXunlkzobuoegZwQcpamFnGmklFuptX56H5YSpbdO4iD0D-WmscZXvfDLoku2fcPk1BtSt2dSWEIczxKP1_-5pGl1OZVATYW69A=w1152-h1534-no)



I read some more and it appears that the secondary side has two serially connected windings. The first winding gives about 61.8VAC out and the second about 3.3VAC as I read things. So to achieve the required 65V, the wires to the rectifier should be soldered to the two ends of the serially connected secondary wires. Not as this unit was wired where only the first winding was connected as can be seen below.

(https://lh3.googleusercontent.com/0cWc2QfAE0GeUyyHORMdj5Elf9fVNpZDTnzA7klNSwfEY_q9R_fXd6Mm2vBeWr0Hs19w7sGNUqslEjU5LdeSb4HzNafj1VpNvcdlwJ7o3AragK1AseJ1CXCWRyvfEO7pr3aq5y28d0xJXo0FTvm6hfrXLeZZ1o5sZra0SIDFzTX7XL1C4G5O5bcxVzhxCtOnV0dPf3Q5ZCn8Ug2LN3GAeWhTXnBbfsU79z2V0zXYdtnO3nV38LfKQQixQJ7GxuHGBZwoFNMDt0QdlREOfIk4Rf4_ehhYIdUUpXkx8ST-049ukbzlICnimFXQveZM5hkn0FcSRMQdu55uu-ROEd-hmfkbxtPGRCulCYEPPIpNodybD01xB_lnfrmhjDHQHQCfDtkjTHSuvos9wHExEUM0WV1D1yNc7zAdtK7F0G789Y96brBA0VEfJBDOLNjVGly2onu3dU6JenY1Gax9tCiaJsejG8dM58YOPmaeDBwkMHgxwA0iP4SdfyR9ec4aahhunRUwTsaOw2VCbZuPiCv8GbQ-FbU9s61whZQzTlcwETUdVOE1GdBgFSx7t_zafi38RyfSa_fMdfB3nmXmG_IxVR7G4M_crfDPqq51gI5ETL-EFjG2ws1h5Ur0ABYN8G7lo0_ch7P1LA0j-kcUTQBjINEqLSza3S3S05XH9Pib9x5k5MoW8sP6fIZtcn7i6hfS75B-N8xIKI3eEsdwbA=w1152-h1534-no)


Having said this I have been browsing the transformer connections on the internet and both options of connecting to the secondary side (only one winding or both winding) are found. I wonder what the reason can be? The only thing I can think of is that the designers catered for the USA market of a 60Hz, and the rest of the world at 50Hz mains supply frequency. With 60Hz the secondary winding output voltage will be higher than with a 50Hz supply, so there should be a way to bring it down to the required 65VAC. So a USA Quad will only use the first secondary winding whereas as 50Hz Quad will use both serially connected secondary windings.

This unit was wired incorrectly (if my logic is correct) for a 50Hz system and it was run at under voltage rail supply. This most probably the reason for all the busted components I have found so far.

@HB  it would be interesting to know how your good and your problem Quads are wired and what voltage you have on the output winding terminals. Would it be too much to ask for some feedback?
Title: Re: Quad 303 restoration
Post by: HB on January 07, 2019, 11:49:44 AM
Yes. Didn't have much time this w/end. I checked the voltage from the regulator board and got an 80v reading. I could not bring it down to the required 67v on pot RV200. I swapped  it out with my spare that I know works, with the same result.
(This I did after checking all the components on the reg board). So I assume the supply voltage is 80v?
I'll dedicate more time this week and revert.
I'll post a pic shortly.
Title: Re: Quad 303 restoration
Post by: HB on January 07, 2019, 11:56:36 AM
this is a pic of the working amps transformer wiring FYI.

(https://i.imgur.com/1w6Njv3.jpg)
Title: Re: Quad 303 restoration
Post by: HB on January 07, 2019, 11:59:59 AM
I then tested Tr3 and its farked!
Title: Re: Quad 303 restoration
Post by: HB on January 07, 2019, 12:36:58 PM
Ok. So I get 61.6v AC at the t/former as per pic. I get 75.4v DC after the rectifier with caps removed(open circuit after rectifier) from the circuit and 82v with caps etc in circuit.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 07, 2019, 12:54:48 PM
Ok. So I get 61.6v AC at the t/former as per pic. I get 75.4v DC after the rectifier with caps removed(open circuit after rectifier) from the circuit and 82v with caps etc in circuit.

Thanks for the feedback! Much appreciated.

So your mains voltage is 230VAC when you measured the 61.6VAC?

Lastly what was your mains voltage selector set at? 220 or 240 when you measured?
Title: Re: Quad 303 restoration
Post by: HB on January 07, 2019, 01:10:56 PM
220v mains. Set at 240v. :thumbs:



Correction: 228v mains. I've just re checked.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 07, 2019, 01:59:49 PM
Cool, thanks for the figures. Now I know what to work to.  :2thumbs:
Title: Re: Quad 303 restoration
Post by: mygoggie on January 07, 2019, 02:03:13 PM
BTW, desolder the cap across the secondary winding and measure the voltage again. Before and after mine exploding I read a few volt difference. Yours could be leaky and affect the output of the transformer
Title: Re: Quad 303 restoration
Post by: HB on January 07, 2019, 02:08:20 PM
Will do. Can't wait to get this thing up and running.
I'll probably redo both amps price dependent!
Title: Re: Quad 303 restoration
Post by: mygoggie on January 07, 2019, 03:18:35 PM
Almost done with the component list and then you let me know what sections of the part list you need.

Do you have the Service release manual for the 33 and 303 in one document? It covers all the components and values for all serial numbers. I would measure all the components even if they are in circuit (ha, cct @marantz123  :winkwink: ) especially the old ceramic caps as most of those on my boards are faulty.

You mentioned a buzzy noise. My gut feeling is that the C201 on the regulator board is faulty and letting the cycling it must block through. Check it as well.
Title: Re: Quad 303 restoration
Post by: HB on January 07, 2019, 03:30:57 PM
Yip I do and will.
I'll compile as soon as. Just found out that I'll be free to do some tomorrow   :shh:
Title: Quad 303 restoration - Transformer
Post by: mygoggie on January 07, 2019, 05:16:39 PM
Based on my testing of the mains transformer and the kind feedback @HB gave, my transformer looks fine.

So I started the cleaning operation. It is important to take this process slowly as rushing it will be the cause of a botched job or damaged transformer. Yes, it does test your patience.

I first cleaned the external plate end faces on a wire wheel to get most of the rust off. Looking good, but still some rust between the plates.

(https://lh3.googleusercontent.com/NRkDuGNiTt4YhmgohjTswAoq7MRupbAXpR_5VeMESR_BO-Vd8EWHlgbg0LcyFH6Ljxyysqr1tCoaXpcgdqfX3JlTNYpvTb7BYRKKQFTSrEYtdfHlkJJujm0r4cjBg7JN518gCrfXXpeTuBGdHYCeCHSVul88lIH_4X47Iw1pUZ4g-eXu9auYYcS_UUw1v8CpTzKqeEof1yk5_qF5uTFyairgYseyTqn387-ZPJjw4qGvDGXCN8bARZNhEETo92UVmQovg9b7Nf9iBcd-LJIb7YWHIWzqaaH6vyUYmt9rNpt80y1vvbuWu1SXAhQxCRcSaN2D-Tjjfb7XQxTZLO6Kjh2LKE7tOFNxlf0K8Gl9gLaqrpxUnF24IW0mXVqApr2DiOk1VYFuXYVw-pT2Q06zpv2R1o5deBuOKHFY6qHggJ5BFm5ayC8ej-RBu_YWSxe1nxzhgEz4ZazgPB3LFGbnBJQ-Ocmk9KCiGGXEIsgciv0NZG_gVbBwWjVFTZ7cHJ6bMB2rakbgf1Vsrs4pyOs_YzxdOul6HeXdPz6ztpwb58Pkqj2JRe5JMP-FtaS9Vm2ZEpDhiMx1yDSmBZpIsm2asFekZ6PArop2CQ5I6zGZhCN0k7rPjOEM3pSOd5y9N2DlOBjBgUEQtIEciWIbsYdNy-ZHNcqynZi1NOeMZwMGjFsOp9So7J4W2k3LUWz7aBjKIVLurHOiMBNdTzutXg=w1152-h1534-no)


I then mixed some phosphoric acid and water to dilute it a bit and then worked it into the gaps between the plates and left it to convert and fix all the rust. Do not leave it for too long as the white crystals are difficult to remove once these becomes solid.

(https://lh3.googleusercontent.com/CoQCIbwNAJeGR1cmUfGHZv1Pt-1YiCXx6OGIfLbgK_qH-N75htqoZCxA72vZ6IErYngi5DKBgCeckCQXRbAxQ6sFmd0pZUsyc6R3cWu6_TdSbZHd1-OG7q6l-fecLQexBZuVvngdvjsMhbRK0iJycx1_9Q6lXu22O9XdwOiWy0E-saSqnnW0HjI6x0u8sjLYroATFshvf4NJS7T0pzL3OoPdagNGwOdpBb5jONsdOUVdufg3gETtRdzN7UjUMLoqCB9VG1efJF8izWmNMrKcP6pJD_vLFkwSjM9Yi7U9CKQvM8UktJ6WZ2h5vEifqyzAu9Zb-KbREojVijWYZw7fiIV6inaab8IzdoZ5bISbA2QzNkAO-5E73z9_YAbpvihp2Nl5VRmeTYanlOaRuR5ryMLRvxpnPoLrjeDT9G7y6GCoglXuer8nEtgpxQRnl-GX2qmGGhaxYh7kTLF1KEEgvHXjLqIu2L_0-R9k8kumZAtriowQKWCDWM-DtCH5oQVWr7jq1TI7BqG1jGo7dF2el21BwCHgaZ4DAQcqc9MSnla5Rtg4tV9YhHSpUTCNO0UoNYOjm-PkvVUJHkdxWuo7k2xxEbFfKLZ3uDBUFZzbsIZTdiTSDir_2p4Qway8Wd49r9cISMDc_Jc2x4zMhtuMpI6CnIaQiV_O9gjXcNqEt78jTH7zPG2EvSEbw-rk9Y2WtYxohPCcHnrA3w-zfg=w1152-h1534-no)


After about 15 minutes it looked like the acid did its work and the rust is converted to locked black ferric phosphate. Now to wipe off the white crystals.

(https://lh3.googleusercontent.com/X7jReUMi_uHSu_IIZ9vNkQbdKf7ZjygJ9q4hXCKUbVWzJjgoi1q6x6MpCADgprdiYV26jJ6wLIIr0EyOPJ9Jsu33MQWYk5cj3h10CCypt1huygLAm2uPSM3cISmqWBB-P8M_cfVQIhWT0DOO2hrbrEHeFoM2R_3c6ch5pDBhcyLTUgsT5M9HE0AWm5V_0cy0KOSNMK5hT_FGzlDgQHwPakKu77Q8a7eCt1CDk0w1bsqJef26FIBtEJLR6speRTIVBVKpXhC3as3mR8I2oEZYMB4AktYkyttVmstNdLeyRUdJQADG87Ya4HYOr2Ema6BW_wjXVCtQuiu_TLRqr6wfrJSeJt6Yiiz6RDrVvoBNcxALWlMzzIJK47n3vdMTgwrVi0orvM5u8ABTRiN-DbDIzUyTSXnljamQ18mN7_4hO5QJhCyVdpx2jtGmJ4-1dYIrwNxbrnQDrUo9rcvTNtM7amKUic2EpbkwtQ4UAsaFdyM1ZuwBhttRMH-9uWgYVc3PR9ZBwTpBrxNU7NtqDOqoHN60GU85JBBOnJ51wBf0M5PjwUULWK2tI7gOsdCVQkjrgTbLQIgNYi1MEjolsidqyE3EE6l7iqdYk1NaeaKILt0iApvqw_ALd1rzLHTlljrj985YY_Hyqd6Ryzo-aFxgnQccADDBit0ml-uXRC-9snTOPyg-QMJA_BmFB4HmF5UHyGsVmmhLUECdqRR0gw=w1152-h1534-no)



Soaking a kitchen sink sponge in a strong bicarb solution I simply rubbed the plates clean. Look at the bubbles forming as the bicarb is neutralising the acid.

(https://lh3.googleusercontent.com/IBKwwyyqncvCKrFMFE_jcgqErGWaB8MlhmXEFapgLbnLqBDKS0pWIQy_M1D5PWH1GJDc5C7TtO6IY8eo1RnXNYehWxgnY1oY4-osKUCGKG0aDeYx5vfbMtZZel3yRdbXexqgGdFPET_WVdvgyfEyZPiw_MuHx08mGBK3vCkymtYF1UJ7jIboHNL01HSBrrdK5Wet1mTwqjKZhnJvPUnuWdWeuq7nIId07-l55VZXKQ8wEioZLNPU7XwlLa7w512461pM9j1flNEjC_HrOG08Qr5rrFvQEgyUfombbHlNFj89Ka48TM8yMMsmhk6r3tZuAGixacOR6ufl4ozTHtCTNVmjc2MAJnbb8ORjzySxQ8Br76D__i64HQQyJHAjkIYAuqAT3xtg6-o2JJXltj-2ZZFncSw8NB4MKMecpy50FNzG2kVcqT3ZbpKleOdSnyXnfoivWc2NPUm_MzC2qTG_lRiU398phIuE5zXkCkFAF_EfOH5kyuOR9BFC-fID50PZuo5JDLhVoFtT0VvU5VzSuZGrCee8T90-aco4rSXSChLZH7uEVv6NRXVxa0mbmN50DjFf4Qn6tep4yJRsL1XZ4I9uGglfwXnvU1XAAheBJrAcW4R3xna4Y7VxTp2GdLWcwpPLYe5H5pEKcNp0MPjbYkdcK4bdpsyPRqKweehIBiIJpMg5vlUadVQ5BNKDNUv8-cI98M-NOa3ncPfRqg=w1152-h1534-no)



Onto a rubdown with a dry clean cloth and some 7 bar air blasting to dry the transformer it looks good and ready for the first coat of an etching primer. That I will do tomorrow.

(https://lh3.googleusercontent.com/sUQF0Ipx6uF5bjKQR7KmS0ksFJLMpgZ8tW-ITd_eJtLCEqRPGrcHUroRyQuRFiIi-yWVUrIaRR6qK-7h3Jktk3tiJSJxLN2RebfZiMEDHveinYFC_H5uaIOqBGSMJZRB1c-tWQpknzL79Uydwpkm9JCSwvgoJbaZEny1aK-A0vy3cikg6dTI7y395y0VucTW61A3LwA2mCY6WmuJlGBkvkiUrSjRe5XiHcz05GoJ1W_-L0ew3KsJ7llxysPz7RJ3cKbyO9_2RI6MCLJjrWux76J6xDWMoEJOxKg2su5717DFmUPGE2z5zpSqBqy_Ulvy3npPsop_hZ0_GpQdhCsZD_IK-OXAqQdTk8XAOaRds1kKkELjorJYTOlknX3XxcDLffhM18bcYwAcEqfWpMVM0KFfsn9nFAsGHOhvvZdDQ214uDCvRAznPtZK6xXmJbkNfRAYcivSBdFt-6NV3w39ivWHkI3w5hI-r57-gDtTx3yP5Kw8KkctygjJ45GSLzk554hznaljASHTqSklanyi7XsUVJnCWQIMYxqV8Gpe-mcRDPpVf2VLHtaHYCmwb4FHgX9QJqph45HCGGg4UtWOvyLpiX-ofxRNGDQVskW5EuyysY2Q5ddrYwdP4zrtTQU7-seXOITLMaY5OPZvEDHx_JYbTvZtAWefCxzBCipcRQoWULR_nl4N4g7yYz4k0ImvOVHHXLurL9aOd0HX0A=w1152-h1534-no)
Title: Re: Quad 303 restoration
Post by: marantz123 on January 07, 2019, 07:06:12 PM
I worry about the insulation resistance of the plates in that core. I believe that each plate is insulated with electric quality insulation varnish prior to core assembly. If the plates are conductive with each other, this can cause heating in the core. Those in the know pls keep me honest here. Not sure how far into the core the cleaning treatment has soaked and if it will affect the core in the long term..but maybe look into a suitable thin varnish to brush into the core ( after all moisture has dried) ..get it to soak in. Later, you can finish with colour laquer when thats dried properly if you want colour, but I would keep it original looking. Please get some opinion on this ..this is as far as I know. lts good that you cleaned it, but you need to look after the insulation..a wire wheel/ brush/acid could damage it. I read on a guitar forum that an easy and aesthetically pleasing way to maintain an iron core is to rub it with a lightly oiled rag once in a while..its all it needs on the outside to keep rust away.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 07, 2019, 08:28:55 PM
Thanks for the concern. If there were such varnished laminations, their edging are long gone from simply sitting and rusting. I measured before cleaning and the laminations were making contact with each other. Secondly the machine screws that compressed them were all bent and scraped on the inside with zero resistance between the screws and the laminations.

I have asked Quad. Let's see what they say.

Also asked on AudioKarma.

I think I need to sleep on this one .... you have me worried.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 07, 2019, 08:30:45 PM
Is there a way I can run the transformer under load (light bulbs or something) and check what the temp is against what it should be?
Title: Re: Quad 303 restoration
Post by: HB on January 07, 2019, 08:39:42 PM
I really need to get a variac.
A variac, dim bulb and load would determine this.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 07, 2019, 08:44:48 PM
Maybe @Family_Dog has one and can send it this way to make space for one of his new speakers ....  :rubhands:
Title: Re: Quad 303 restoration
Post by: Family_Dog on January 07, 2019, 09:58:17 PM
I do have one, actually two ;)

The original one I have is a decent heavy-duty unit but rated for 110v, it doesn't like 220v - I've tried ;)

The second unit is a cheapie rated for 500w but it serves its purpose well enough and has not yet given any trouble.


-F_D


Title: Re: Quad 303 restoration
Post by: marantz123 on January 07, 2019, 10:56:45 PM
Is there a way I can run the transformer under load (light bulbs or something) and check what the temp is against what it should be?

Rather do this sort of testing once the core is insulated. As long as the transformer is working and you getting your voltages, you are fine so far.  Im also for things running as cool as possible, but these buggers get hot and the less resistance to cooling air, the better, hence I suggest not painting the core heavily, a suitable penetrating varnish is probably the right move for now,  maybe our local transformer builders, the likes of MARS can comment ?

I was pleased with the read-up on the maintenance of an iron core in an older transformer with just a rub with a lightly oiled cloth. The oil would improve thermal conductivity while protecting the core from surface rust, and as the oil heats, it becomes more liquid and could penetrate deeper into the iron over time, keeping in mind this is tiny, tiny amounts of oil..not a fire starter quantity. Hmm..I wonder if transformer oil used in oil-cooled welders would be suitable for this?
Title: Re: Quad 303 restoration
Post by: mygoggie on January 08, 2019, 08:01:19 AM
Rather do this sort of testing once the core is insulated. As long as the transformer is working and you getting your voltages, you are fine so far.  Im also for things running as cool as possible, but these buggers get hot and the less resistance to cooling air, the better, hence I suggest not painting the core heavily, a suitable penetrating varnish is probably the right move for now,  maybe our local transformer builders, the likes of MARS can comment ?

I was pleased with the read-up on the maintenance of an iron core in an older transformer with just a rub with a lightly oiled cloth. The oil would improve thermal conductivity while protecting the core from surface rust, and as the oil heats, it becomes more liquid and could penetrate deeper into the iron over time, keeping in mind this is tiny, tiny amounts of oil..not a fire starter quantity. Hmm..I wonder if transformer oil used in oil-cooled welders would be suitable for this?

Over here where I live you can forget about leaving anything uncoated. It will rust. The little screws in your glasses last about 12 months and they are gone, zippers about the same and the are FUBAR, shoe lace hole crimps, 3 months. Stainless 316, 3 months and it is full of yellow streaks.

I will see what I can achieve today. The plan was not to paint the external, but to etch prime the surface to seal it and then wipe the primer down to an old look surface and then revarnish.

Can anyone recommend the correct varnish to use. I think varnish was varnish in 1969 and I need to try and fine the same type. Will ask an old school rewinder in town.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 08, 2019, 08:02:07 PM
I was pleasantly surprised as to how quickly Quad responded. They do not carry knowledge if the laminations were varnished or not. They do however have a NOS transformer for sale for 34 plus the carriage cost.

One reply I received was that 50 years ago laminations were either coated by spar varnish or left to rust (as the rust is a good isolator) before assembly.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 08, 2019, 08:30:56 PM
Today was spent mostly sleeping (finally!) and brushing up on my chemistry.

I have three alternatives with this transformer. The first replace it outright with a Quad supplied NOS unit. Secondly to soak it in varnish and hope this penetrates the gaps between the laminations where rust is located or lastly soak it in phosphoric acid to form an insulation barrier layer where any bare metal contacts are, fill any gaps are and turn any rust into a stable insulation substance.

Onto testing my theory. I soaked a piece of steel in phosphoric acid for three hours and the contact area turned into a layer of hydroiron(II) orthophosphate (ferric phosphate) and iron(II) orthophosphate as per this formula: 4Fe + 3H3PO4 → FeHPO4 + Fe2(PO4)2 + 4H2

The well formed layer that was chemically created is shown below.

(https://lh3.googleusercontent.com/EDH33YpZmZ3KwsNa0qU_H_ksr6vQCYwWHn096VWlWbA8v9WOR6fXJ8EI_u_Bt8Tx_jLAL3ZB9v68JEJ2-WB94f1bjEvdvPQ5HuIzkEc7nndGRFMXQp3tPG2GnZOej-NCeibEhLZxdeRCRJ7CM_3YKvU5PMpQpMxj5LkVj24KlXdmGGGFVadXDiRfKrgncWK5J7Ny0EzQWK8aoyrHdzzO6pbUOcG-97FQGoBUvdgrG56LpvydheWYVqszVTiJikr1QYe-Vi06yBm1vWhxL5lcZFPK2WNAdt47NFY8iyyDabi6B7zjWx0rbOloFdBHdbTeDpaAhyRVQsS6W3qrigKcCVVuVUHfj_B9cZlb9DB8HjcpSsIrP6opYnaYYnuuJ-4NhgKoNQyrmK78lvBCj4VPOKj1wqj5K_mywUG758xtH0iSRG8hGtgF74AwleLTUUjaksmGLSfno6PHi07Rqhj_iI3sSGlU2cYTzI7cTTOHPho6s9gs6HTdaoe4T5NOX51e5y41AkFB61Bzw-JSlh70YiwNTXRN-WLlr-EDCjKSsWoFGMitQGCHf49kpDEzbooamJZcVr4cpSSluFXqYK6PZfoatbakGoKPk40NgkIk2iJHPTo9P4obn9YWEqHiGRiWzaKFecj9tKxnzU_QnEk633E493EjKclWaMev4-mApiGdlcSmqDj3-0w8_MSIi_aj1hjbHHygJmSPG6paVw=w2046-h1534-no)



The idea behind this to create an insulation layer between the laminations using a chemical reaction and not physically trying to force an insulator in between the laminations. A basic conductivity test showed the before and after results as can be seen below. The bare steel surface offers no resistance.

(https://lh3.googleusercontent.com/zEpIdbYjQdCzc_G5bITWJM_3DKDAVb5ky32sIrcwjyQo86l5tmd-jSgeDBXPq74p8Enu3vhGsnI7XFtQAsA0EXOphc6ox5V__8McI41Ku9UySnO9Ofhn7S83J4q9wxXDOMsaOXV1I5ERvSwjq6ot1FSIrBZLMN4stnZjjlYS6ihjmMtziJTVF5apjlSAu4zqviH--ullRrbMxqb5VZtnrjA4GJ5ilPPS21ANWszfwl0G95ai05Am1RfmqrsaXKayxeGX4NEOQOlaMsEqpR32rq4K-iFx453L3HDoOV_3PAviXd6CozaNwYceDn7nJlLuXdhHjcZzdHEi5O_h5U9yLa4ny1WBZ7Sb96rBmze945pHxNjRlT4bFJd6HLDHsJsuF1i86AEWEJEFzQYbEqs6_NzUpTDjXp0WLRUIbd8Mylx1GIDaYtcZ2rtsWRADZZFeQhXnzKExAsLNqTiC3H5btg7NTMKTGjEZIe7fCvmOZxdUcwrd4mOMHwY7qG36qKDXEbz1U8ldOmgJFoYxbT4fa4UqYkBqL334jeLwJtRmndbff5wSlyGZlKzStr79WX8cQeKMmPQOCh-LC-sbwJpCTCSnyNjn4uZxpGIzYzS0TU-60dNmaEB7KrtlYkQLV0Ol9R3-s7S3S1ZEizi4I_hRKNsf2goSy_nEnarBhzYZstzrFIqrJlEojPeYpUCrL79dM30IMlHsShpJq7wMqA=w2046-h1534-no)



The new layer offers a very high resistance.

(https://lh3.googleusercontent.com/5JedBjyKDxNGi0-Gta0ck4VFUeERB8tU7c0vkEB0V6lp1KItLHEgkG3fw12MGq-P5AG-YzoiKcDtTJp8YfYUaQBZoK_uC-a_fcBLGsJQ6CalYX8aEC-Sxy4ssnhbYPPS4MgOWK9yywp5uprsrAHnkaYcmgRAOpskdc_OgSUzoCNU1d_nZAYOHhLYgW-UKftJyWyv1Vm08z2qgwxkQ8e8xyEo1rtWNd71-RA9Bj7h1yEozcflZpZvrriT8dPI23t6O3vMc1ly-TCbd8z2hJ4x2SuFPzVsm0ecIHYToxoyHtoo6Nej0RiIy7M6T2hH-YVm3c7lj107baOjooEzGwwB_CFy5Pa41TnCYZnTYp2HmbCevBcRxoAj8BjDGTnOIoMacCuiS7fpOZzUfDecnDViXZNor-47Oi5U1lmh6-HhfbS9Uyw_uKozHpXk5De-S6GJaf0D__s1C23pozv4yyjyPyxNGdZKFqNdcisD_bENFfzBtXbN1cW1rl3lsU6YgjOaf2Ho9-eHItpPqJWpBzwLPI_x2A6jOrA-YlgYhiQ1Knu7TRfyykF4Qtfmt9fKFQSCa9qSoCFukYfB4UaaseFQma-NLoT6mfjqkZ7hUuHpKRHSu8AmQFfYrt1vK7YDWh0jYGKqIXzq-P9jKKAM8VgRrVBKkiptElTWkxV8qmviKa1I_HT9SlKYe26zTFCBFNcHFRIzrPugF7QG1nnsrA=w1152-h1534-no)


The idea looks promising and I will ponder on it some more.  I therefore decided to scrub the external sides of the transformer with a solution of water, ammonia, methyl alcohol and dish washing liquid. What a lot of grime came off! Some air blasting to surface dry it. Now the transformer needs to internally dry out and wait on my decision. Below the cleaned transformer. I wonder what the pencil scribed 680 stands for?

(https://lh3.googleusercontent.com/dniGNsu5zFt05iQfu8-X0h0IaCW2-Xc6l6JRezzYfbopaSQEzz389nr9THA8D0nAXYOoCck0zZDr3syvtOrqggpvXkYSa7kQvjFdK5bMBQ-9HnpHKvpMXvz-oZ2GaVgQnWJ_5seRq6l8XGSfnzCKAoGuXoFu7BDXwlpZSWYN1WhO_gd_-_BC77m0YygwcUCurriQt-TkkFzGi4lln2HpGC6ibqeyOdTZG8p0x2Gh6lw7UGvCqEySuUzK4tawTK0jsrIPUIqSDXS8lGPJve6y8TRHH6qAbUNdNLEz8sAnIEgACSr-beAyPU71JUauvwTED5RM7m6u9N2yUfBnT0z1LM9mgdLaS3wqmSb3z_0CZ5-mOdRSCTiuMuBus0aj5CZ-lRbDyWw477t_MtVbFxIB24WVtT8UeAYd6DRHf8pYQ6EjnZHjGmCKyflQf084DiiOvCsOa5rZmfq0mtIdgVXjC05J_4n9dZ8OreYs46a-byvU0dYFiQzOMh66JT4-IyVlcE1NjiAn5zPQRCLsDhHN3uOGmFpbU8vriFDE6q3mcwxm-25PJxHvVLD4P3u_euzXclzh69xuaKlmQ5hdG_Ii3MhI06c09htXDIIC0K7-9PuNOFY--_g5OvdL9V1k_nBk9XXx1MeOJr31CovY0Uz1OnBfQ_Ay1dU4TCW-1gknkrHni6k1H9DFOKLMglwTU2oyQJH6BltD2hX2V0i2pw=w1152-h1534-no)


Oh BTW, it seems that when the word acid is used, people see horrific things. About 2 billion people drink phosphoric acid everyday and about 7 billion people use it on their skin every day.
Title: Re: Quad 303 restoration
Post by: Family_Dog on January 08, 2019, 08:57:59 PM
Herman, I think I am going to send a container load of stuff that needs rejuvenating/restoration to you!

Looking good, methinks you will save that transformer, assuming no shorted windings.


-F_D

Title: Quad 303 restoration - Regulator board PCB
Post by: mygoggie on January 09, 2019, 12:52:55 PM
In between everything, I started to think on how to make a PCBs for the amp. I could use one of the opensource programs but that would be cheating as the original was done by hand.

So I set out to do it by electronic hand using a vector program (LibreOffice Draw). As can be seen below it came out quite good and as close as I could get it to the original with all its flaws. One thing I did though was to square the board itself. I cannot stand things that are not square that are supposed to be square.

I am also thinking of adding an extra soldering point for the new multi-turn variable resistors. Then I can either use the old blade type or the new multi-turn version.

So here is the draft version.

(https://lh3.googleusercontent.com/9frZJMZUV872wz0qOvXD_aV9m8_Dz-9TuCksqwfCtB1tvknA_8AhaIA0AuE8KA3kL2-CZJsm0mK4Xv9BzQJucjTHUQcy68VOCI7x9f7YAyiIsugeDM4OQfV9i2BLLERwNgJNAQgWA1mkpgrZrpNqU8kfJ8cuXrkv4vOF9x_P-GicKeM-Uy02-o5Z76VUF3SdBQpY-XEngXLWLucFzPu9flkGbPi2VxGebO75hNypLeAJWsBW2Jikd3lIW28ryiwZKosdYT1k-Rv5sEDxdFSMyK1jKlvVahQVuuaoCspHk7o1hu_5JJlJevLLrrXHc5076_Eft-3cceKgC2tSlaWFkF7X-66O5yHgo_49Bhf5a6k4YzNnWrrPTTWA0Bwr7ubOb_KuIxMPSAV8tAb_-mcTC97GIS8YWf2uI1PfZUvke4_Flrl4azFExw7vZgVKzEaZpCF-blhLc6IO7iUsUH_W6Zo1sx7mOkHG2yu8XxR3oyn6ullfCFFTVViqaP_ugxwFCo0-ap84OJvn90u8za17mGnfmYp-ywdXXlrzhhvobsL_orjYnUTel5GCBSXpoaB95ifczmXBaIPK37QCNXQhnuNHIxNUFQhX8Zoih4neOkw_aDskbjEX-3OPk0YF2L3CNrmdZvu8LMi0rVjkXDasYaqpfJJaNjLsNv-Z0H3Z4Fup_85iQKPB8qCFsbAzZ6hScngLa93bhjbQ3hJlWg=w343-h443-no)


I still need to refine a few areas but need to know what the minimum distance is between solder point copper tabs? I see the original PCB board had the circles cut to create a distance of about 1mm between the solder tabs.
Title: Re: Quad 303 restoration
Post by: Family_Dog on January 09, 2019, 02:00:01 PM
Your PCB looks really professional! 1mm should be fine as there are no high voltages on the PCB. If possible, I would prefer at least 2-2.5mm personally though, which will allow for stronger (larger) solder pads and less likelihood of solder whiskers being formed. This is probably what a standard DIL IC uses, but soldered CPUs are certainly closer to 1mm spacing but no hand-soldering applicable there.


-F_D
Title: Re: Quad 303 restoration
Post by: mygoggie on January 09, 2019, 02:26:27 PM
Thanks @Family_Dog I do appreciate your positive feedback!

OK, good I will trim all the spaces to be at least 1mm distance. Nothing like a miniature solder whisker to make your life really miserable during fault finding. 
Title: Re: Quad 303 restoration
Post by: Family_Dog on January 09, 2019, 02:38:59 PM
Herman, also have a close look at the spacing between the track spacing towards the centre of the PCB, just to the right of the '12038'. The fifth pad from the left is too close to one of the tracks for comfort, like wise the pads (transistor) between the two screw mounts to the upper right (north east).


-F_D
Title: Re: Quad 303 restoration
Post by: mygoggie on January 09, 2019, 05:01:06 PM
Thanks for the feedback Eric. I made it exactly like the original now in terms of spacing and routing. Still need to work out the multi turn variable resistor tab.

Latest rel 1.0 is good for scrutiny again.

(https://lh3.googleusercontent.com/CGNj2W_td4sPr23V2cJNTGeyqvO8F-JXlvhbD76DGu8wv8ZtRfSj5OwxuDdb6aY4SYtc0bGb0zlpMIv4P_tJvAW_OcwhuQWOkrR1nj3FTiihJRhpzE7ZwuezanVVbCW0o7OVPMOyjZMk0cyZwxzqYHxA_Ey8AWw97vdYQafQQcb-Ze9vXpf0nja78KHKWRColS5ljJVf6cqoZA8xkWWxPjEjIknWVn8OOx9YNshJqOSA8wlSH1-VkBMHebhwWnSaqNhnED_k_IVulmS03OY6hNJNOGXnOxZC0FjA3mVqg3GARF-kwMMn7WjqzvoB__KRDl_Ps-IGJMoCuYIcPGa6PRERur_v28LUo8ufR7Lh7AiADy-m_WCKyky9-xMEKpmGfRgw7-ibxJqrpq4NQxSChiN8DwJa6OQpQLoD1FL_gK9BLedmkY8ZyoEyNztx0BOVaxvIhO2ksB0MjAKn4cMj0C9HgZBpquRComKeexOobHQIiaZ3xzRJf0hhjT-81UaOQl62i58_dT-qBDb4etxH051-Lj-4veCycvdzQLBB_gI5WfBkF4m-rgzftUn-8Fw2bPQdbS1DOhfpsbXGkyaKfLBYypiq5S-BN_ehiuzLdDYR7NynyBTJm9cm3gGm0bn9HPrxtHVeLENurxHO4dezC2yH4BUs2gbVGd1mK1tFdvLWd77TxANntUJHtyL3txir65JNR_YixB9iYjeKBw=w348-h443-no)
Title: Re: Quad 303 restoration
Post by: Family_Dog on January 09, 2019, 05:06:48 PM
Certified as good, you may now begin production!  :thumbs:


-F_D
Title: Re: Quad 303 restoration
Post by: mygoggie on January 09, 2019, 05:24:50 PM
Last night I was awake for a bit and after readings some feedback on AudioKarma regarding this transistor, I decided I am confident that my idea will work. So I made a solution of phosphoric acid, "borrowed" one of the Boss' fancy plastic tubs and placed the transformer into the tub. Next step was to fill it to a level just below the coil space in the core.

Here the transformer is on side one ready for five hours of soaking.

(https://lh3.googleusercontent.com/pifgdSaqYEXJ_4UYYCmyof_9TjBqoVnlfskfaOvf0ZRpTvtQS7FPorwrtVfHu0pb6d5sAki3oTLxbl5pSxtPME7feooceN-uROccgWIfPccTJJl_P-jFNcMAYBJCzDw-btXtXYrLY8tZjnJJcDWBJLLkBviJZNnTg5g9vlBhf4YBCWPV4qrsFcy23xBzPEl0VbNiKFA5JOwAdex_8-gcKK4Eqi7YzzUlPBoECVeOe_P-K48MJGF6G4TCljtE7R9fNx7OyqqCa2WJwU0IC0ltLS-1bpLlMgOCm1n64F3LHQ2ElVc7ogQsO11ufg5qxXMFWWN-NYyru9IGxi0y75xQzJV5ENhEIMkZvx0_mRVTh8kKG3Ep3QZ984xxrHyVvyYv49hVLORLmRrPNaALSECKuhtyE50mhnCXTS0hctYgd0cRBh0OtmnUAuxyGY2yZnn9x3SM6L2z_Tvv5w8iJGqGejOVPP9tTNwuzwR39KUUiA6MQklQfH0OxaSksDuNGBrjfKyNtsc6-5UFVFfHW_EcH2XO6rWZLyheBErlNIy7gZ4_tFr4ZG50xeAApWvPanN7zztVj3trVlZaNMRfcQY-rEqqJGYQAZSTGz_0R-Bz4pQx6lUZ_fAh1CdiYQoe5AU_mXkBxut_cC8uksYunw1lk6Csz8u8ZbKnFEumuyl9JQcojKxOXOfr9hiUV-T-vpT6lBcd-P9p8BOtXZABjQ=w2046-h1534-no)



Side two after five hours is in.

(https://lh3.googleusercontent.com/y7hurQVfenIdpWUIRPpsxXcz8uC_J-GDC8wV7430Y7XcTP4NhrepatEzQOd_y1b0EHAsyGHGLP7JtUBpPctIoVNuSB8K4l0mu0eI_mLdV5LjmBwGll3wUU6fZ5XJkJOD_dwdMa3miHehCH5t6iBNgzG3cBSazSK7F2dhv7VFwcmZ61XwceiBsqt2fI0NnVgxF7SB-1yeTCyJZjAmx2d_10hNcyAoNhDUNylCWgZOx29c18IyzzSB9woJNxo2on5GsZIGkaHrDP8RByc1xTTHLwLLm_KRch_xDi-v8eH9V4FMUoD_KnDejeSduQLavCFLg_faqJyh3NnPQZkGexZZ-B-3O2z4CSwImyO1XyVmN_DzFLOjXA4m1kyWFigET85wGiwPT6vnf7hWx12b-5W86VDX4E6FAlzK66710UYZP-kacYSmSJ0dzoQXV4zuhAaV7sq2NctRfAmJIbyjn6xsxOquw2Y9YzQR4_Cd-2G_KBF0sH1EVL6pU_i0d3xOpWYhcaWF2ZfqGmSqx0ExLBZUWPceOrz7DebNTMmzU04Jd4eFcIKOgA3PWmIdjTC2rcRzSQtRujmfptL9IEW4fSHIec3jwJBIXttQ9XW-lVL8J50pkBuaCZXIzY1uNe7pHLFvytYOwSJK4G-EzoHLgbgZLMe4jnTjTGoJX8XJZVLnRjLxQJoyTv-2ZDlMeUU1g1JccMlhaAT0G1uc6Tc3-Q=w1152-h1534-no)



And after twenty hours she is all chemically isolated.  A few random resistance tests on the still wet outside shows no conductance. So far so good.  :rubhands:

(https://lh3.googleusercontent.com/FRx17qqi04_7i5OkDOkYQitCtb6emAfIy4pPBfX-oZoCy42NjxPU1S18Vt_c78rijuaIZeLZinBWYx8c0pDoYko_Pi7kIVCf1hYkCwj267BzyP6Pm_ezmL2m0y1cCPd76wCskiurW3KJMf_hKj8IB3sxrQs-Zoa_idMoiV_oiy251rQQlUqu9vChIhIBZgsWL2IAFd8_mG-orlf94IzkyT7lmG3k1F7T9HID7pulXT8FXRXnOQQhskMkiG1eMeHFlx2Ofx0FLsFVIBwMjPYdTN35m54mr_1HiC52ZT5biUarWz30N1ro0nHYxpW5p76sq1mX2iRBUQdBlgu1AD67Vmsc6WWGH_Z-ae1Ek_WYlXKeLECDlql9EWxkDu72JUjYokAqLhP0dmyLXKNbI97QZH2BO8ABaXvNv6n9bk0vBC8Px92X4f-UrgVJz2oxdyGbLOgRvtcChCHD3m_QXFo8VWwtJAW2j0GAXSbApG1wCSmFo_UchACP3kh6N7v1Eeku0oNGRLKadhwcpfhVvz0SFKGhn8LcTatDIsvzgC21ROoRWRVtXuQqOpew4PaGbf5bHaQ50NpkzeX4V8agw30gwEK2o1aNmTTPBFAtxN5wnev92gwSvnRZLZG9KMxjsTpd1nct_d4_aiZCoRfLe9mcN78HB0B6X2cPsESHu24U3Sl1nl-N1VBuHn_3zvoA42no8yyzOxecfuGJKVsH-w=w1152-h1534-no)



One plate is loose so let's see if some acid solution and a clamp will lock it in place while the hydrogen is still bubbling from between the plates.

(https://lh3.googleusercontent.com/2Kww8_IDwQrA4ImIzzljRhyPZum4ADEg5Ecm9ehXiTM1iD_hF-RiQ0xB1zM3xdtfp6JU3nsn6NVZjy4EMdctTpX_eqkjLKkdKa72fuKlC_iZpde2wEJRXFt05QlOGGm9J6YoZ9vyb8Eyw-K_w9--bkpIEfZIhkJtA6EyW4kOiwpJwAYECuTTU1pPtK1_z8lcS2axk9dHMpwm4utkqZUBvTg621v_opQ5PBQXDt1yAGXVh4huYJZkf-F2bf-bi3L64ZzOolo19VG0T3LUzYD6zI_q-tnllHVloqVcFtAgB5yKNt9NENZuMx9or5UElQzHYQ0YvL_6rpiA_gfJ6WnjpM5-_OAYX8Yx33wSlGl_f0Ku5HJdslnXlLSet9-7lG3h2dhuc5ibdDxjHDoLRHPtNcWbji_wm9EH6AaFwR6PWAjTrAQgnNC4EIPkqf2hIeBrWvAbAyuNBDuI9UiOVMZQ4LN4pINHRL5XYNIbAgkbT3_nrtKs4TDO4GuWUE2hJLlC4rl4s85oFMpJCfLpbEy9RASuo1_917H9LdCgyj8-hYbo1Pbt3NYA9IqPcEEpKmaFNRlBhjONmyvzSSmL4Mn-FYj_R0MJicCrq3R4tPx0zP_BiEvWEy0r51Zsyg66_ZQhmJMo7L79x_-Tf6P4Jh43Pcq2P1y5N_trOg0p_vbuOjsaH-E2BudSnNgcSc8DGS_pX62cYhaBHlpPwJadJQ=w1152-h1534-no)


Tomorrow I will ask the Boss pretty please to buy some old school spar varnish. According to the knowledgeable guys, heat the transformer in the Boss' oven at 75C for 5 hours and then whilst hot dunk it in the varnish. Let it suck in varnish and remove it. When it is dry, dunk it again. Let it dry again and then the day after dunk it again. Sounds like fun!



Title: Re: Quad 303 restoration
Post by: mygoggie on January 09, 2019, 05:29:19 PM
Certified as good, you may now begin production!  :thumbs:


-F_D

And herein lies my problem. I need to find a source for the old brown PCB blank stock.  I have the UV light and other equipment from silk screening days.

Also need to complete the regulator board. It is simple so should go a lot quicker.
Title: Re: Quad 303 restoration
Post by: Family_Dog on January 09, 2019, 07:12:53 PM
I know you want to retain authenticity but if you battle to find the brown paxolin borad, rather use fibeglass, much better product. Mantech may have various sizes.

http://www.mantech.co.za/ProductInfo.aspx?Item=352M0554

(http://www.mantech.co.za/Images/Products/PCB_BLANK_095.jpg)


-F_D
Title: Re: Quad 303 restoration
Post by: mygoggie on January 10, 2019, 09:33:45 AM
The plan to lock the loose lamination worked quite well. All good and here it is ready to be baked.

(https://lh3.googleusercontent.com/4OLcL5wXXpV0vOqAqWFygEzueKnGFdDT9egc92ZO3KU9l5TqSrJ4qAMQuqxLb6WWFeXkpUk_GNyL87n7tZazcTj7Q7Z9HWheV8gRNyjk1lageq5CG9M3Yyj1tUvY65iKynwR1pq22mywVaz2YVq5bsVl6u2kIq3w5IM32m__H5PuQw896qAh-gq0ioiTdkfDzUayMv-7wY9DhbuwZK9gPBTWZWhVlnNX51heblENSPymvPSensGzBSZR_awE5BsOq8EB34TR3AEqd5JDNkb8RB5dUgHJekMp5tcbSIkw73roxtjK2SNSGk5KEVZcMOSJsqtx0x1yIEKSkTnVa1VZyf5L-EiR1pE_LJhDFqm5Gue0NNMLa_UvGTdL8mgehBMZ8y32g_6fEBg2It-gOjHxKW1BLYyfsoSr9tkaMWkm8jHgBtHqAKzu5SVHYYixub5CxEKsBW3eNE1H4z3r9DshMyu-tfUEVphOkuapOZCM7azAzUKvDvCyHBCZXTgVxmVovYxiaAxvQchmBxwylVGmIs4J0sqqXQq_LvGIaqMlGA9VVKkosYu6NFjLFPbOCyjpf3_mwrbn7mQ9vXtHCGem4VquXXgHUUH6XujXyqArCdlrWn-XLuZa1Ye17n78Ly3SBCO_UILIBSE2r5GChLjKyrFn8noIipxFqJ3pm7INN1AK0ar0gR8LGNHJEnpgjxvwRtc4PgXdT9bRl5GqKw=w1152-h1534-no)



And in the oven for the next 5 hours.

(https://lh3.googleusercontent.com/-CLO7Wuh72cbyW8q6hsfKIc8Icm5VdIdm9URQarArKmNBsiJb9AIA6oVYF2K2AswtTsxEeun5m-IKBtu8T49Au11MooMMB7T9Njpp6uhQepFClm99V4wGiCflHtkdpC4jiqtTlDUmqQOFIkEtZYWRMO88xHVDidsK-N-8OOAFcKwbuBmBGOqFt982dGeL8C0fXk0BP3SCJJfbQ65GCjNKIJ1-h0P_ZMPediKf3_1VfODW1T4Jw6aIUaUHE_yEncVHr0PqJB4Pt8_Kkwhr0I57jcpCdslnGlJnCxXjGdQtl1MtbT4bYJU23OtLiE7yF_8nxbEav-gFJPJSjucf5atGblvpePESJowuMMqhxjhmPCZTf1Iwwx_viuOLMA_aRDlweSFHwpxcpQ_AkDVw9AukHhW993e-1k8yHljM84-msgSENDoUKeMCcFgXUAn3LdMXji8RGVHAnjXjP5xJrH1aa2JQs4T7aZ8-lokSWO_AeVEfE9xyWcvQzU-6G-Bf-4zyv7xyIZFHOR_FxWLaf2ZiHNAHk5s_3449MYEco8oz_JyhstzOi_gN8jS98X23viSLi-EB6XAvKjyxstoE0WTf26PjhARKZ3WlI65sa9IurSdXNqiHlazc2L03t-jYr9LqytN5xEXjIi3c-kHz4zoJ4EAdPZHO9ZMqpwq6TIAphKyWnrpoD6UwcwcWfO2PqW5Q5LCMgmjyoYa9K9vzg=w1152-h1534-no)
Title: Re: Quad 303 restoration - Regulator board PCB
Post by: pwatts on January 10, 2019, 11:32:48 AM
I still need to refine a few areas but need to know what the minimum distance is between solder point copper tabs? I see the original PCB board had the circles cut to create a distance of about 1mm between the solder tabs.

There are tables for the minimum clearance for different voltages for flashover, but of course you need to take into consideration solder residu, inaccurate PCB etching, thin trace spurs, pollution etc. that require extra margin. 1mm should be fine, just verify it and clean the flux residue (may not be necessary depending on the flux type used but better to be safe).
Title: Re: Quad 303 restoration - Regulator board PCB
Post by: mygoggie on January 10, 2019, 11:53:10 AM
There are tables for the minimum clearance for different voltages for flashover, but of course you need to take into consideration solder residu, inaccurate PCB etching, thin trace spurs, pollution etc. that require extra margin. 1mm should be fine, just verify it and clean the flux residue (may not be necessary depending on the flux type used but better to be safe).

Thanks for the info. Much appreciated. I double checked against the original PCB and the original was cut by hand to about 1/32" so 1mm is fine I think. Another pet hate of mine is flux on a soldered PCB. Just spray some flux remover and take a toothbrush and scrub it clean.
Title: Re: Quad 303 restoration
Post by: pwatts on January 10, 2019, 11:58:40 AM
I always have my boards cleaned after the through hole assembly, purely because it's easier to spot bad joints. Most fluxes nowadays are the "no-clean" type that needs no cleaning as it has benign conductivity and reactance, so cleaning only serves a cosmetic purpose.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 10, 2019, 01:43:00 PM
I was quite curious as to what the transformer would look like after 5 hours of being baked like a potato.

And it looks quite good!

(https://lh3.googleusercontent.com/Ddfl0HBaIotoLeQZ7xMUIk7WkcMDgJPrcMp48iyULNDQB4pVSRW2ub4kBBHbPFsdjiBjVSaokTMmI1c9k75NRHYxcz15Wn8QxDv4uxpOb-FK7x9Tg4NZvLuyycRRyDqWQFTX0UPc5zHQLomdbFzVxF29eLucavhOD8OCoGSJeq_uH95sd1OOLV9UK9b4_rTcta1Aq8ReVqIpg9WViHCyJjWM5QXwQw9XIFbOq213YCGuK1aYt1yoUTLuu4mCtzhHovkYJmUeIxaKZAjTWYKIFwgbuYjTdy-iAQrxbiao3z0m0mYprOndnrbFmuct5-0lTg1ml9y4t65VpggNT1dIqBtRSfieApo_RwRV7kqNYp0KRdL1_VwtcHWlQUyVa9BcDKFh_eNNdxflpGk113tfjEf9QTB8mUsH5iVj-aYEqgmux4QZRQHq5bbBAWd7FFGKn5fOEYiDUub4l7eqY8SpWNo2Axap2cOACgYSJdJKUcDE3JHSAiatwQGdApn_EaU6w0BA9lkecv03iwPBwA0KZQluCJlMRdBswmnyLSFma3XFQoT2Rt1Z-EBHoDtOQVtkYvFMXYgujq0qG-QzX3zsePl8qkesUY_cEAG_4ur6NnYMNeoGcGRE3oIf7t7aESDOB6NyI58azHdBHUBamzd8dWQ2Lu-cPH2F9hYPDnDCGsxjXtB_VhJmMZTBStf3RkE7cMnPbky-ZLrdZpTKOw=w1152-h1534-no)


Interesting is the moment I took it out of the oven the whiteness went back to dark grey. That one I can figure out later. Now it is bath time for some transformers.

Into the tub it goes ... balanced on two spacer block I will slowly fill the tub so that the varnish can rise from the bottom and push possible air bubbles upwards.

(https://lh3.googleusercontent.com/GTG9ETsW5GSBOhHNYS5xoXg_OC0IJhmnfCnE0TN_3DsdLkAsrEd2ttJnFuxyFzQkhX6ZnFv49UGd_obxeu6GuyJAtpAwYKQ8zd5EI6Xy_1ja4CBfSTT6avJYfkCm5MGgi4NfT3smZMwj1tMdzOAlaRL-cIHpRS1ln9VhydC4mLRkWDVlYe75DMOWspfW--2z5OIm1UyW4k8rIlYAXIP9gWqEm60ODmpP8Twu0l89egrfbiDmKrrKJbL9J9GPJZJjmXfPE2y9RDBQLx-tzZWZ88b9NmBFkRWcg1hsJJrY0edJfmfIRr7lyAShGCd3GThh0DnB8D7boJEfmmUwsGWptxoUqwiLuORX9A4umJnDDliSxrNx2VoG5Is7hcI7vu5kF6rshWpLwTHL2pi71eeb3POjYaXikXvkSXewx2v5eabPCuNY-8xzbMrePll3-3joA8G4yT6G3KsLVOCeGuOJ_tMmqJGmQPUV1uFjvqT1cFMhbNLUdjeb-H_Eqt0fEb0VVwFsY4MmNEP-4HlpuHc4GQQPI6U1-OQEUxH1XFNmE_rcQkO5dCHjvZcUJdITPsPF7sdXLYPo0aEA9ZCnMTJNk_IwY5Ze8iq_cz7tMS-Ykg--Qm6qzmpQV9DnLE8QOTxovcLABCpS-C-ZKSLIfX4SNHNA6ixsqPizYPGCwjEcg2Oh9l9oQx3gTIJfnO2GXew8LvTHSlXZymPVPUx8BA=w1150-h1534-no)


And covered with varnish. Quite a few air bubbles appeared while vibrating the tub with the transformer. I stopped when no more bubbles appeared after 5 minutes of vibrating.

(https://lh3.googleusercontent.com/ThIdtQQPHsyPWFTityY9Ywd0AUEh63LWox_klCx6kYWwPHNwpf18J2ifjftcGNvntferI4ySCxXl7FUpSJEaItn2ZCCHN8l9pk199WG_QeQGcnixbV9o8PbwRZy0vFR-UDntCs1RV-6eL2Yt69AoSYjpEb-MwTlcTHQVktQKykv7O7BbNKEQTduUSrRMp0sLUHq5-pnEm--4dKxb9roUtKZlRtdlZg5kFNvyrxVdLutKddNOIIk9L-OiyP2cVLe6cYowWRNr64VmTek0MPRarQkX492LlgVAGHMkeWQfm7wvG5N53CA47-TWdbYkjbeo6ZxCBQzkoOND1vlCn7hwtYjiFzf1ZbL45aKtAjwpJGB0c7q37zFqKUoRlAiaWlWZ30omDQknK9OFMuIL_JHcbdLr4IwijvdZkiKTZb-EgsReVLgA7XYeyW9shBCxjU-QtsvsUaMeBoPJBbo2Eyls3u0c39uijRNNfp6_QTjuhN8v0uXyOWUv_zIXTJbXvcB8Ufet9xLEjWVOf9zBmJbM7hK1pPV5K_oJCpj28GCLVGLoUSbIFPGrco5jmZNbQBctolBLv6YTOVemNktR5x6YuFqd2Iq691SdKfJHecbrq4rYpgCZDO7eyF4JNfFgano2Hb75XNcJhEHcIa5omQ95-OTWvISj78kqQXv-Sxa8dgLqkMmBd0uoQO_i7t6R3DHsaYDYqcDrRM9nY8IQnA=w1152-h1534-no)



Now to catch some ZZzzz while it cools down.
Title: Re: Quad 303 restoration
Post by: Family_Dog on January 10, 2019, 01:55:43 PM
For a guy who is recovering from tickbite fever, you've been pretty active!! At least the transformer should now have that lovely fresh varnish smell ;)


-F_D
Title: Re: Quad 303 restoration
Post by: mygoggie on January 10, 2019, 02:17:47 PM
For a guy who is recovering from tickbite fever, you've been pretty active!! At least the transformer should now have that lovely fresh varnish smell ;)


-F_D

Well, I can either feel very sorry for myself or I can sit and read and write and when I have the strength put an old transformer in an oven or acid or hang it to dry. Must say today is not a good day and I feel rather sick. I dropped the pain medication dosage to a quarter, so maybe that is why.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 10, 2019, 02:19:04 PM
Out to dry and yes @Family_Dog the nice smell of varnish is present.

(https://lh3.googleusercontent.com/cIhLAzTaRKFfpihx-4duka-VqwuoFcyHDTK12wU_6X9y32qU_QacWFAcJJraoVPy1Srs6Rcwy3NY-toMuNX_XE8IIlBKch-DAzib6WsR4OmcBlYs-lsMZ-1JEst0s3M_dbj68pU-41AiSrNfIqmPu8Vdal74mNbY9wQAJaZwabCuikkC-tpzRzPOwihgMody6eCWC2Nh1NnpD-xL0aogMbxnaBHh76pwqKf6O6vNLUaNp_zN_tXLP8PBye3KDrwZ9rDhjFIxJyOmA736u3rNbd5TNWR62C8Vd7P94KKKsl3CrFb-ugFcgXqUhAE85uaSAQ9bvV7WwXplJ6wahw197LQCYAOqixcoozg2q10MkI2xQgTFMGBQyF_vStMjQcZjNjzPyvNuv80k99n4ADocdQMitaoeMdPTWFrZlM9BWcHnhEAF-Xuu9ZGmDNiYcGSlI1WJMn88ZVCLKz61Gb9WJydu90Q3Nqd0r2ME8IcM2xeIc4FuGKXvDtt067HlT3q-Bmz025Jky-4e5Hk5F4Otl4jQ2k_wmB12JLj5967wLAoheMpGXagy1NwV2xzbv3CuIns7_U78eq7BRa_xtmebQo0Cuxkqhkc4MGmJcnt1f2cVrbcNonxIFMJJVeR1WPp9BpiR7USrZmNcaVW4jw7vuaMbgyqvnp3ESol0LNdVRM7Q7dvvA8u3u_ZHMMcaQGu8V6IlCzvyOb0h0LM04w=w1742-h1534-no)
Title: Re: Quad 303 restoration
Post by: mygoggie on January 10, 2019, 04:16:46 PM
It is amazing how long the block of iron stays hot. It is now 4 hours later and it is still hot to the touch.

First coat of varnish has dried so I moved the wire hangers to the opposite holes to turn what was up to down and what was down to up.

Dunked the transformer again and hanged it out to dry ...

(https://lh3.googleusercontent.com/qGuJATEojC1evLISX8EJazbQSsKCIgc3RzdT27QqQhqTfkFmWpzHeckS_R5CfnudmrXxdaIBCUmDJ5A3BssQeqn9zjRqibtUQ74iYQmO2J41zMeerD0ycBQbBOVzj3KkhLmhosJcgx0lG5ueQtYT_WAgQ1sxyfkrwonNRd63Wna18RNDvSLyX5qV9bFt1D3Fpcs-zUcTDPpzMCvpFaQEhDfDncGg2KgOaGk9bjiJnsfRnZO0Cz59yZNk0xfMltHiyottLUsOl3wvpFAdjaAbAs8qbbZTqfnuniv8VJsYVs_wNzFghgBAHu7BmUrWQvjKWUL8PYCCbPJXw_MOUSpU5nrEU9bcBih2SKBn1WVRjhWAJP7kmKdRWo94niVTX5fPNtVDHZFqGfc7bkZ-IP8cKDhw5A2xyY9ut_wQ6uIe8sfkkMoUYSqcTMgjuwSNXptc7cVJZ9OmMW-TSsHnPLE4m6fi8pLfi0LTMnkGeoFobHc33xNb2fkWht8As2ph4FQHPkys8PavuCJ05dxcQAOTuAfc1G_16wpJ_M0436VPQHscYBKIYuf6JwfMvWx6GLNcQaSTh1o7B12vP18cEu3NXLufpc6qKvNdK4lVogomZWF1Fza_OYyosfC0UEiKAeQY4rXKC32MSz50lq24oqFLb_c6r33F0_ANf0N5YnNFFxqg9pkR8mVwQFoU0LNd622xAWxyHU0YtLdCHagTFA=w2046-h1534-no)
Title: Re: Quad 303 restoration
Post by: mygoggie on January 10, 2019, 04:19:57 PM
I forgot to mention that when I wanted to use the tin foil today to line the baking tin, most of the foil on the roll has oxidised together. And I think this roll is only been in the cupboard for 10 odd months. No we do not use a lot of tin foil.

So yeah, everything here loves to rust ...
Title: Re: Quad 303 restoration
Post by: mygoggie on January 10, 2019, 06:40:56 PM
Two coats of varnish completed. Looking good if I may say so myself!

(https://lh3.googleusercontent.com/KPZJBhuvWSFZFhtdKL-W9BxJELHhXEUv5Ii_-FEXVLyM_8ahOGEBZRFQG9IaFe3PHB9UCeQcBnO_IBj7by-Xr_6s4K4PhmK5LR6yHO-wb4edeB2W0MFL-tIvnYg7hoqKVWbW-dOfk3Fmd_JvYy_dKLMYET5Zjp9CJjzjvGsdQe6acc_i54o6uabrGt4r304ya3aNxd5lCXcCwkp-xiAQntLDQWDPIH8tR3NWSJ-tppAMKPjMcqM5y2_Z2YtXGR5ZFcrQq31tQ4HvUrrYIEr_BDEDr9ve9GiZcryfcX7sHExBKyytgrYxb7lsituhlfE1-bcTnDl7gtI0ffSqRSayi8JrZgQjg5FbCnFb_YVP5LlHa7A5AzpLMEOK18l-BSxolY-MUvRXN_Ofb9IuQkBczlODbvp7lHJAkISUt_Td5z5ksTqi2i5QAJ503aqg9-2-NwGGlGIdzcTRtz1FPSd9G0eJ6A-59181RBuKXT7XdEwJ0VY1r0FnRUYotfluTfYsrqosmrXVvZDrAEKO6tiBFSBQF1VDClHnci_X-7-D1ltOoYXRZnIgrfivBC25c3HBg5Wj9swlCW2KYzBVGLgKV24--Nbm4DwzET4uJHZYCLa3cmcvfhLZiZKZlk-T8JMjgJnwIhQq7dC-ZqRQ4FP8rsj1=w1152-h1534-no)



Tommorrow I will figure out a 60V load and then let the transformer run a bit and see what it does.
Title: Re: Quad 303 restoration
Post by: d0dja on January 11, 2019, 10:17:09 AM
Nice work on the restore. Following with interest.

I think there's a permissions setting on your images stored on Google... some of them don't display as they need a google account sign-in.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 11, 2019, 11:05:43 AM
Nice work on the restore. Following with interest.

I think there's a permissions setting on your images stored on Google... some of them don't display as they need a google account sign-in.

Thanks for the heads up. Will look into the images issue.
Title: Re: Quad 303 restoration
Post by: Family_Dog on January 11, 2019, 01:35:20 PM
All pictures should be showing now...


-F_D
Title: Quad 303 restoration - Transformer
Post by: mygoggie on January 11, 2019, 01:53:12 PM
Time to gather some energy and go and see how the "new" transformer will perform.

First step is to check which primary terminals must be connected for a 220V input as found on my workbench. Referring to the above thread (https://www.avforums.co.za/index.php/topic,76695.msg900371.html#msg900371) and this thread (https://www.avforums.co.za/index.php/topic,76695.msg899467.html#msg899467), I made up the following table for ease of reference.

(https://lh3.googleusercontent.com/pBwOzq80vjiWaRpuUht6SEL5OgCMHp66tA1Mhxv6YN6cQ9c5PHyA1eNrf9XqMsNQS-JNqM6NM3lMB6sYUD34a-nozr6qfOUbxkr1PTJGB-RFuN_an_-hp8oSXHge6x0f6mwLeqoVhqhniB80xSDtmWZ0GyiOPWrIrcWTFbzjUe3ZQDzGP1JY34LgxpxIcDg7bw3JdoJtgMZWklGgVz1lL6cVOU8VuyZfkU6ANeA6zD6Reep4gJium_cpvRu6eZFrcPw2sdt1x6vSZERc7kCZZIu3fUWAAqdkscA7_laXCzM3S4mzCdkWS-PXEFrJFpzgs_f75dzBcix5281yVWW4uGL61UI01yU6AXc90fHSNpVSKgR7XkHXPH3C5wnJgsN1_v4pBdmvJI3IklIezp42Y3YkXMlrw8iDNWIQX-3n_bOPlEp2bBQpoTI91VFxDOLVLqtyLD_5zG-OCZmWx-HEtvW8YtOfuWR8qfsONyQX416ZplcKvMoQmGxAawrOTLHbQ3Jp54zPdcSmHf3Q5Ae48Lnw8pHtK_h9cblQ3pTjOfhxvsR7x7Ogq4xJSRM99VnAOJQe5j2Cw0h2_H0BucVMbSSAlMMyA1wAEI-9PAu24jIt-LYdngOty_hF5Xcqofvbk72oWgmFz-oukiWCLa0GDzWn_T10WLpuo69wfgddkggDYeS42aC-PIVtxQdFG5GmJBaLXpyt1_PWBNCeyQ=w290-h385-no)

I must therefore connect the two outer terminals to the mains feed which will be 220 VAC and install a bridge between the orange and pink terminals as shown below.

(https://lh3.googleusercontent.com/p45HxPjD2EbwUZeNto2DtKCjVnRfoWgUq70OR-48CT_xGTLv87j2sADbNUmFNi-Tt5phnIOLgcM8_fE5NRKvFNvgkhY_T-owccrnnsDSK5KpA6_B3iU_twnoEOAlr5G6Ncv1x5a_82U6o2x1V8Xjq7tWcQ0ihEW3_KbhaoI1LxTveAcsTNCS9VQlCeFWzJ6vG1cJc4tS3MiNnW-W-xWOOxeavTUX_Y1Q3K1ZP7Q-GpSzIooGn3LZqbwhUrvC91bjG6EhLUIvBtgTRxuNCgoAKiNKs5yc6WNs9Hgt2Sjk3CPl-Ry7DP8sVu9LN-D8PHUN3FiioY7A7RDPiN2qIl6ksb102p7P788wWQYu3BOU1Zx0gmQuGDMXmlZzpFAhZaFNKoMGSgM-siwJidsfTy8n-QHPZ5gT9Y1r90LR-rqSOE9XLShtO8ySXOMu88V3TprJ_DDMHjG4qt0H5CGcyeAuLMcoX6d_aJySPEjprdVM-MEL0b0fvoJ4mzgT6Xve2cNCSzTk7LypuFq8VXDVq1X5owZ9od3IjaFi0AhCc7HLts8Qnw62luflPQuf13Qts-Df_oQ8Ug-8mJIwDnRGgTBGRA4AFbGHG2DrkdJDdga6H7alulyzr_M5F1eYJ46gt1oIzuTihu0twPxK7bKN45lYKHsxFpzuB8uD9MTxU_RqdIIdDRO59KFTrBigoTinOIuzTloQ4A0QapFrfOlHHQ=w823-h854-no)


As per my understanding of the output windings, the outer two terminals are for a 50Hz AC system. I must therefore not connect the output wiring as in the image above but on the two outer terminal.

Title: Quad 303 restoration - Transformer
Post by: mygoggie on January 11, 2019, 03:25:43 PM
I took my time and checked all the winding readings and it all looked good.

So I wired the transformer up through my isolation transformer and my overload light bulb. Here it is standing all ready for the switch on  :thumbs:

(https://lh3.googleusercontent.com/p4g2oKmX4nd_0r5d-E4FnIU5B_lfmS3s73YAA3MbrHsWu6jBk8AgYIeJBynAiLy0knXbkn4c8jpInLvgzATGlyb5wDW0b6TKMkWNH2O4jEWMNNUS4MM_aoEZdEO4HDcMSBcCDZP2PQd3JEna498xZdWFINQYXeAH44jgd7olojceUd-4zk04HjrcUIpWRvKRNEH2qMvu0xFlvmdzxIn6B1vtXoNNZtwSt4rpSrZgb_YlEpRgzroD4BWf8doXhgygXrE-JdXmeGxgzzAoG9O8swPGmeDKDylyckpFSFWdZzN0nE9J4USfY_PvwVaPeWdmETee_T1ORuX9EF_12fv90786yUlGniHXK2UXlUmOz4SQfEnSy2lVe80_XDkpU829mINUjZ5AVBk4sYa-eLXJegXIlKIWy8CnQHEWKLAwttDGY1czqcSiOs31CeiEL4YWOLBTMH1eTm9wXv5jiv4N1V1XGhOnRwx6m3zAj9wPtseHQurYQexRy_0Uq7J3DxiSP_p2P-u1AL02lMVUBJ7YAG17ZHD47pllI1FbGRjuMEFSmVNSdK079gDvfsigT4zEm262SOeuGUMbMOmi1IA7kGWb-l-KYgBRLR6dXnsBXZ6Ay2WKifnCJ0rRD8PUDdNTZ1FVpxu44HtTm90HugYHZZIEdt2GO25kfEnkD0cVgpp6uB2lKRSh5r8BRZLKukMhxPPt31YYhjo9xkqTrA=w1152-h1534-no)
Title: Re: Quad 303 restoration
Post by: mygoggie on January 11, 2019, 03:46:38 PM
First switch on I wanted to do without any secondary winding connections to make sure the voltages I read are within the requirements.

Today the mains supply voltage is once again crappy and the output of my isolation transformer is a little bit higher at 213 VAC than the previously measured 210 VAC as per this post (https://www.avforums.co.za/index.php/topic,76695.msg900371.html#msg900371).

(https://lh3.googleusercontent.com/wuhdwJelNWJcUjKpO078rU7aYfUHgBxReDHac3QDY-T99d9EER0wD-oA1Ve2O-aRRVQvo58fTbGapLMRjcXbNMjaWPKZ1V19oGNL0y4O5QKbCn56hoU6SAk1TKjj5dmv-cIzDLCHvpkeLS0B1JY20xo3tfD_pPlW5lcNPU0aqcIw-Ehmcw3sI_Ep_PscD09v05n4kYdkvNrLqmJz4BjbksV1IXvAcuMZoubEYmIIcQGL9HQ-TF3G7OG-8cs-3n8Go8U6-yOvU71yg7ec4YfGE5H3-9rUBMBNizAJzF5EmdrWIYKDSih8ORTfJSbIswAm_CcKQivZRDKIrxbgZ8JZGYWX87BhR7tZzXASoXxDyVlcdU0E9i2dXWWqeQuCWq9DxWql-JR_YB_bATJvZ5zXGT3KKDG5j9eb3qPMwhUSV_2d7N8peScsKDa6LiZcSj1ej1yo3dJA5C2Sc1UjPBzciqmz7doG2GDd5GeqLGar__VzFwwGWqQIgObkj9sUFAyhrSDbRu9XYyTxj2qjvA1AbYtIwjIAHL3sWGDcefLifbaV8UpeTLzq8WQNe2sLslSwnrQR-fBRIDdfkfYOMjlqI9V1docOGIpRvzfJAcAlqsTS3AIkQ79491KArGK_nGzTq2geK9MbG2TiU1UQUR66PPnOsmOVNhEVOGj0wKHtcJhg0cDekSGsu_KaqfousNZhwzYW2wAcWgdS-clNoQ=w1152-h1534-no)



I stood back and hit the on switch. Nothing happened ...  :faint:

So I listened closer to the transformer and I could detect a very faint hum. Wow, so much more silent than before. Excellent.

Time for measurement of the secondary voltage. As can be seen below it now measured 63VAC.

(https://lh3.googleusercontent.com/O4hn_sAL_7x-MKrwLfHB34gYorlyg6_SgphNGK_cgUMjDZtLKLRdmqXWU3406uNrMq567G6oGsNV9tCRFVrcPN5CD9NY3ung67g9T4zSHP-lSdYbKOX4ayzZj4SMaprU_7wVEWJPhW8Y6Rt7XZpUSCZwoTH9Uqia-bPW9aDemcBR3JvJFXeJzRid0FXfumRYel_Qjpqr2ZnSL_o0MSSDggYsMyVsg0L58KUAzQHgD7rrS3jLEtRHoL8o1uwN1cH61SDkt83z7G060V7pgGN5Ym-PM2xttVwt7O3zaTQHFpJ0xb7FWEDfezGaR1auNlg2Ysk6Hh3jVMG1_NmOjiziubyIDzSjgd-jQ7ydOfWXS4w_HMBiWXsArqbKyK4xyJUt9dcmXD5sg0j5alBf3o4ADlWJRo80K22K4TUlWtf8rbgiryk365JK6Py61kjFF7rD5B66PrXnJND0wa49oPOD4IO5Uv9wDyxXkfjW2OVO7L8s7uCSQst3SclSX3pcwlbS1G5MlhGmmHBiMvEFzRZ57nQDZo6ggKkhq3OXRyPHXGhy05Um3YbqYhEVVXIjHR9ycUXckqCt4SQucADsZoppl2mhX28D8YvdDIrVvriP45sUXWPeEQXuqQR31TR-JhgTXuAzWGs_dWR5RcME2QvGrcs-12gEUUHFy13liL8yiLcMZKMusoYhfLUtHcWBNbAAXfrxqtP5LRjbUSMkAw=w1152-h1534-no)


If we do a quick voltage ratio comparison between old and refurbished, we find the old Vp:Vs = 210/57 = 3.68.

The new ratio is Vp:Vs = 213/63 = 3.38.

This means we have a more efficient transformer. So who wants to calculate the percentage improvement of efficiency?
Title: Quad 303 restoration - Regulator board PCB
Post by: mygoggie on January 11, 2019, 07:15:01 PM
The regulator board was quick to do as it is fairly simple. One thing I realised is that the PCBs are not all the same length after completion of this design! So I failed PCB design 101 as I never checked this when I designed the output board layout.... tsk tsk tsk. I will have to resize that and move the tracks and tabs to suit. So you learn, so you learn.

Here is the regulator board. I think it is all good. Please check and let me know if you see any mistakes.

(https://lh3.googleusercontent.com/b6EYUGmly0w4y96IeFh3JxQiTnch3vgt5-QkXPUkYsCDULqTvQ-ntENoUohq5sfQfsW3mmy4oANMlc5el_M_1c8Xj7C0-Ycf2_SzbKM_Tq7is7N_wLj9JjuDR_OXM9TFjnxPjURjCVbec3XlVZpcd5YmP-B9_s7Y1mHrAp-x1WbaV3gRJRmskgMmLwhzyHDAf4hgMUFWHMatupZy9uHtgpKLK05epen_gRO0JLBm6uWMz8ce4JVrpcnuJTXxgz-22itwmjFuMtR9wOuBHV5cHMamUfKsTCoNruiTUwkxMYuf9AqJ33_d6NvgFc6FPauklkwCE95OL8__hFsDU64KYszHyrR2w7wROkd02TGxuNW45ikexHyfPxfPo6_Hn-cxAX11TYOChy4HHtxnEoccqzsay0qNQRebA6LyBaZ8EIRPlf0lrfyI4TPJSV5YNMFVnHhbkGF-HnFFE_XV9CQgwJSbzgT0gXlb9r4u7RKyPqRYU29ryC_Rn5OTKBfBP2BYON1Mz6WDheFlkVi0C4m7BjHHV4KyPHltVQcSrIRIlVhQy7QODG9S2k8Fh4-_wVY3hBS1czz7Vyfi2m7MNhoH8U0TPJLBFXToTy7YHs68duC6WBPk7jJPAf4YJ6VTtHjuBvzli4JfEW3gSwqwObD9v50FEKzJ2-uOiaJWBemmb9hLGBpwP7uDpqYOgWnM5dT8aW2owdd274BGd9YkXA=w198-h460-no)

I will see about the extra tab for the multi turn variable resistor. Actually forgot about that on this board! :shh:
Title: Re: Quad 303 restoration
Post by: mygoggie on January 11, 2019, 07:22:34 PM
A quick update on the transformer. Good news, the transformer ran under no load for two hours and was only warm to the touch. In addition it is more efficient now! Tomorrow I will put a load on it and see if it gets hot.
Title: Re: Quad 303 restoration
Post by: Family_Dog on January 11, 2019, 08:11:48 PM
There's a bug crawling on your PCB...   :giggle:

Just one thing - the bottom screw hole looks very close to the adjacent track?

Looks great, have you sourced PCB blanks yet?


-F_D

Title: Re: Quad 303 restoration
Post by: mygoggie on January 11, 2019, 08:43:26 PM
There's a bug crawling on your PCB...   :giggle:

Just one thing - the bottom screw hole looks very close to the adjacent track?

Looks great, have you sourced PCB blanks yet?


-F_D

Yes, the bug is to sort the small bugs out ...  :clap:

Yes, the original is like that. I did move it a bit more vertical to get away from the topside of the hole.

(https://lh3.googleusercontent.com/h9hocn6ef19nCAMYVURXfygDGzbJK9xvBl7b_eNcBfXO5FgFLMNCezgVdAD3UUdIw7tsuRfqoml_DSAIrYoW6c3Wo_1-D3VNbO_2VIRLMcXgIGnFxvYFd4r9EJDeNEPcxuC9o_IIE90Lt52zy_cOSxH2pUWwM5NyHoTLmBUsKOT6vcXd1wuQAr4uFlkECdh7UM2Xvh9S7Ii1osWQ1iiX0MBzCs4NfPvyXxKX9Se6cgmXkL13HAW6WJ6GWJ6jBpFMXcq9eQtJGSS4tztcbesh-VH6-fLZRPOBIXp-5uT3E324Xhx56K4wrOeUnvLm6GacNRbOluhX4EXczt9siHJvWLKLpPNrWrpKI6vPnP76tf1eCnWtyU3PPVSTjpadCOj-uck8Y5ziPMGhht55IoPboHYsn4iAY7rAjrdeaUo7Ao3lz-MyfWnnlmIoekQdeIgCtAdlx_cB8IcU-ibgC7wueuwiNXrVv0RDVQj7_0h-46htYM_EBzNXtk_yLYx2XZsdRbMieW-xoW-aWWLWEVcx1yol3D8nfSEc-oo8Gk5ODTzgkWanrJ5G0GHerp9IhOis1z4ICFO215ann1bVo3qqJBMe5UWX5g3nXJmdjui2FDaj16qa3h8E-YZwznG0a6-fkARwQc7wG0_o_jkIrE5jTwpaDFEu4K5l3pamclGKQ6ujpVN7SrPd0_cEIirz0QWvg82gdsrORotOZ_VwwQ=w1152-h1534-no)

No, I have not had the time to sit and really dig. I learned I should search for "phenol based single sided PCB" or "phenolic PCB".
Title: Re: Quad 303 restoration
Post by: Family_Dog on January 11, 2019, 08:46:31 PM
Personally I would go with fibreglass for the boards. Looks better, is better and most certainly more easily obtainable. Also, the bug feel more comfortable on a fibreglass board, kinder to their little feet.


-F_D
Title: Re: Quad 303 restoration
Post by: marantz123 on January 11, 2019, 09:15:15 PM
Man...this is a lovely thread!! Its been ages since we had such detailed diy and so many pics step by step....thank you!!! One question, what varnish did you use?
Title: Re: Quad 303 restoration
Post by: mygoggie on January 12, 2019, 07:35:43 AM
Man...this is a lovely thread!! Its been ages since we had such detailed diy and so many pics step by step....thank you!!! One question, what varnish did you use?

Thank you @marantz123, I am a firm believer in learning and sharing so others can learn as well.

The varnish ... I gave this a lot of thought and some more. And then went with what I had in my workshop. Good old Woodoc 10 (https://www.woodoc.com/en/products/woodoc-10-indoor-polywax-sealer-velvet) for the simple reason I know it penetrates everywhere and it dissolves oil and dirt on it's own so it should reach and clean the spots I could not get too and at the same time do its coating job. In addition it is a polyurethane and wax combination which renders a very flexible sealing coating. I have used this varnish in the weirdest of applications over the last 40 years and it always just works.

The idea is to put the transformer caps on once I had these cleaned and then dunked the whole assembly two more times.

First on to testing the transformer under load today.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 12, 2019, 10:18:38 AM
So today's quest is to build a load that can vary and at the same time run on 63VAC. I looked a bit on the internet and could not find anything that is not expensive or fun to use.

Time to make my own design and see if it works. I had a bunch of automotive bulbs and some wires and connectors in my treasure trove and this looked like a fine option. Just some ramblings from hereon for myself and to see if my mathematics still makes sense.

So a 12V automotive bulb will work on AC or DC, so that should not be an issue. Five bulbs in series at 12V each will give me 60V. A little under 63V, but I think the bulbs can share the 3V between themselves and not get damaged.

Each bulb is 21W, so 21W x 5 = 105W which is just over half of what the transformer rating of 200VA is. This is good as I can start up at 50% load and increase the load by adding bulbs in parallel when I think it is safe to do so.

Let's determine what the actual power rating in Watts will be in terms of bulbs to get close to the 200VA. Now an incandescent bulb has a power factor of very close to one, so lets be on the safe side and use 0.98. Our 200VA full load, will therefore be reached if I use 200VA * 0.98 = 196W of bulb load. So let's try nine bulbs. The demand of these bulbs will be 9 x 21W = 189W which is 196W - 189W = 7W less than max capacity. Great!

Onto building something fun.

The electrical stuff I want to use, and yes the bulbs were corroded and I had to clean them ...

(https://lh3.googleusercontent.com/XQTNcbhfpdT7pFpjlwv5buSCRdGJrEDPGQdUevo9MXoE2Xz4fDDpXjIqe3wUY6OkKQuOYkc7M2vanM7uth0Jg3R1k8geubB_8S-ui9BE-kzZC-o-bwKHXf9tnMnoVmL-KQwaSbN3U4vrZecIamIKjOu3VyHKzwgy-7XtG2eSKtZHaahK4l0sAw_1H_TKC3CHdXZwQ-9xYzl1qPFwttOJb5NAOZVwovcNjzczI-mhjJ0wXiMXhUigR4BEq6i3c_rVXbAwqjtQoU8Ad4EZORizVY_Y0r7szpmULCYinXRchZ4UQIY19BQSexNvG1U9fCUpYPZ_PIE2weoJ-VghEJW394Cu34uLnVH0uJ5OBQgjqShMcLTRi58a8sk8ZOEswJN-KNGtpguNHVm0f3lvuxIF4riUhIU7Qvnn-G8yB_ljQPuSkFWXLHhEE_EQ9z-Xhq2J4wb6peVFPkSE4-eoumJ49ssv8YFjhogT5QvNZDMZqfOZNXgZUgkF3ZPm9oVf7lyxdtdzC2NJ_h9ef-Ka0vOt7kiSS9Q0MiV85lqtYGLusbBOwrybkgO-n3fmhSYvC-6PBO1cXb0RrYYGhuOFhUdhbgYGfzLZvWv_BJRSxjGqHBH7-XMxHeT9fbCVJyggId8GZNXRBfWTXQpISuo9XBLAMWY2FDwgkFKxnq1sWUF6C70dfO4E6ED8DJ9jg_4SusvjtBtT_5r3bAQh4c43Pg=w1152-h1534-no)




I had some scrap wood and quickly planed a short piece of meranti into shape and drilled nine spaces for bulbs and some holes for wires.

The basic idea made into an object and ready to be varnished. I wonder why I have varnish available?  :thinking:

(https://lh3.googleusercontent.com/ynpzpegULnjE_7-glBT8-aVl5ba0Ie_O-bZcyOXCT7KF983YRgnNUyM2jKIFuE7N8tpI9avcWTBfYGWHx46reFiHLsV5ZIBoMVeZoDpK8eePvrN84F5I55j7m3WZB410YqqFvUScyuZ3GfnvQxHETp6qfaZa8j39ISw38TfKPLbCR9JKekmcKDmkI9uUoGQffJwcvSINdQQ1GQGOHg8uShgQBOKiIT4em1BeKO09RkDO-Aej5wvW-jMBSQ-uVeD3QQ_KuQhu7FYmdbvmvzOaPWRMYkASX9M_0r41A8rmsJrrfi-xrbqJGm4xVvqwGyVFVEJ_u7V51KsMlwtRK9YczXZSn3IBUf_cDAR7mVXgRAFZgTq-0SYL9rd2w_cFRMpmEsP0J3mSdBOEL1z5gKl8RhazACYi_SsdOB34kruy43Z-r-jP8032u-2M94Q85_fXJz_XJXFcpiAMNi-MGBqbcgqeJ0Hx32SS7hl7Fkrr2iMzE1Bu_mRLaK9_9aNB1uI9RwtRakK4ea0b6tDBqEMw3T7YTmtsvcDBAaO_hlOnYdCbtJFsdzdyKnpGk1c7tFfl2OXHKrnAPSnSEGQ8HvSnK_y8hoENLWEozTGo93cwtcmH-Sa_tFL4OQmDCxng70kyk2MrKUbKmLfeYsEZt_dWiOZ5pSFRkLd6hxQIkkuJhQ3S-gFjr0OIEVCCqAKrSraVqjcOpWn4HZWrqCqI5g=w2502-h1534-no)



Going the way of the transformer ...

(https://lh3.googleusercontent.com/AjXCw3ukIHoE0vwPw-3-Mdo_XCVm-h7cecDXfD6WbHF3Amm0cGOfphFQdcxrP-sScc_RE_uNDbHAiMOCU4SgU5nylofP113kxfXp1YzPBe2PcXcupCLAJOmtfaf7gwuoLIkKresvTpKEarDnIcMz9oAylj69_tN2wkkiEJEXScRBi-MpDzHjLBXHBvuRYsetel5GdWuM_OUz41RIDQWXQfOVF_KuZw9gUtLULUuAIlaoJP2DOCLzQfhvUo6HKVJ0JqcVouFOJ8HJnyHo7TQDSiGxBO3Qgmw-wasPr_V3zUVp2J1FswdvL11a3MOHDYFjvqDkJvuyHDk62-wjd5bCgolCbioampkhMmxl-oYyOACqzF6RLymHMIuRF6JexcDcWo78pgZSlinO3AJ--qFTO5mmuwBapGp9r_oL4SdorOFCCMr8EKL3ypfRLfZo4muW7gIyaL0kXldymbooNBhuU8BpHa1JzW_1DerGtJ1nPWoMu0UHFujrWekISdkjS7FCbA3O_gzgRQDLJm4_D18crl_dAwE5ZYsO9h0mGmTDBwpgJLo8UHWIzAYJy0nJSmdhx9br__zEbzM2pS1qWgeoW8mKVjqMxWG55h1IB0wLE0vqM-RcN1zRKHrZF1eAojqcA5_1vaxl0e17UvLkBinvKNxNTw_X7inghxFtmjjDYQ9Ej237HzhGhM6kMtfntxRtv1GAwAvnlrXLiR4zyw=w1152-h1534-no)



While the plank is drying, I think I need to rest a bit and listen to some good blues.  :groovy:

Title: Re: Quad 303 restoration
Post by: mygoggie on January 12, 2019, 12:07:17 PM
Good thing I listened to the Blues ... I realised I forgot to allow space for the wiring on the underside of the board.

I took out the Stanley 78 and five minutes later, there was space!

(https://lh3.googleusercontent.com/k4Uke8lmKoqijzXV8W0fDNO_rWPx47a0if97zaB86d7v1SztGB_kIlLhv5vRdeGrnt6tzOrUxwymqJ2fjRWK2bf_xRH8pm3yx2VduC5hvyGajIpa135Yv678UPyjeezeNnlqeSMVvyw_ZCoxNeoH5G7XyLeKfggsQomjByf6z6XYYLdt2P2ihma17SMLpkup1ZGFdwGFn0lXdmpvacRMb-Z00jYPERqOMXXvTRNWBH07WpvBUm5KNyt_SCPZhu4e6hMA68Kgu1LPH_4WB9rrri8JQGaZA0swsbCmNqzUVWrAB4tac7c0tLi-VsHte8p-vj2QGtC7ondVSzbh85dliZGetLGyZPd4swknLEeOcZJtFZ1bHgWVPVuZ6avr5qf4FcZe6BTAi654aa_QOoN3TBdO4U800uWrp96tQfBtnxrlWZSsgTt2FParAB7K9SBBEVJuiiiF7UdMw_f_B7ylKz9nbnLuzV2Csu2sPm51pqQhODK-RH9aknAPEl44fsYvB0i5CWLtiqDIZQMeDSxOIYzGBsoqZotqa_nt14pT7gwhDb6-1rqz5DwpY2CB8ZcxDsLZaczhqoRjJtQuXFLQ97prs50aoEHpJ-Y1hOT9waEF7dqqqVANEs4vN6uu5CdwjpUJZmrznfwjZHecSc6HQgtJyJa0nWnUBnJ_rWAwKCDw4kDVuE0rHcWmPfn_w2ZvUU-fc5ymzOJehQUG-A=w1152-h1534-no)


Gave the board a second coat of varnish and while it is drying I made the banana socket holder plate.

I found a scrap piece of aluminium from my plate treasure trove and marked out what is to be what. All holes marked and drilled.

(https://lh3.googleusercontent.com/X3y6Y2xMB1XO41h3jW_w46xYve2AhE8o37MH4LzuT9_Ph_gdYBzZy6n3Uqta1tWkPO6Saw3AshUlOB7caf7paREs_KE-gEbIA12AsUDsoPZ00iZ6xPNsqssWoqS4TAzxOAzWHAucSf1eBPEuj5dTWVgDsi6DWKXnHyWQxDUZtLbbkroAv1cfCB9blFgisaymu83gSUBmNMftCO7xIJR1ArSOx7ar31FmjSVnuNZYK6k6hCudfbqE-EiP0Mbc3sDAuqDu-kmlKH1c5NMknBWkd7DoDqycWBstUVFiUCyJGhsVlQhedmiOUIRCtCkHUep427_57mvcE9RTpFHK3d7YHlIl1iYqxz_xhWCBRIkkEtjUt4CgK9VSQeYmm9vYHkzjGSAa8AheRfGaat4gaH77BnMhBL8yLk4nmizndZLR6YtaRDlr_2T8AVBWgrtpTUOaAHThzU2gRc5WlehZ_yZRHhooEbmOb0SVbF34SOG6nUohBc-1KB8r420Rg_u6-P6wxuGHSyz8xj-nG0RCSTNNHD8m4qFEqC8izDwtl5HoB3yTgAJ3K7TDzWaSuWChFwYkwBN3TmESA-hvxeBpsmimmR76IqZGg9w4HiAoxdybJ1rnP_n8gjOkW3bEKgu2tfO-TVFEhyIn4av5qT3eq0PJLLsSwysLOARABWkBRdrp-obDKxZLB0Ukua9pIvoRIRBhWns1GWc6-d5D3omy4Q=w2452-h1534-no)



And the plate ready to be screwed to the board. Just waiting for the varnish to completely dry.

(https://lh3.googleusercontent.com/GLjoTMKkdRxZ73Po3oIni5zfM6wstBn3acTP3nRm73krI0AF85weVj7FFZbMSl1Z5YSioYwKXsUU3CO3FZpf7uNPmHFNhCVROqSfaFuUKhfbsjr1Ym0ErS5aEq_xMAqWLYxHFn9Nh3cMJQUJ4pi9TKBbx88e91RpOHGg1sf_FQWRcwZDe1d8rafTC_DgE3zKO8ms1YEZQvmBw-bVr5xBAdhH5e1bfWNjUPBeYzrz6pJnXFemYzT-1nTItbTYAXQFq93Watve2Uq6_-xBxXlirKhtbH9iMc57LIncdsmAQMN6vERSXZ62L4I_WzvoDCduVZGwp5xyxcpo65pqifqwbeBrliAL7aQDEZutNuXvJ2HUV1MEnnkH3ivKQhsheF4llRdOI6S2Gc7F2TPkqW9RXxxmt1z-Mdy1CLIp0j_2dYlaj_KhoUqcy0VyKPct0FFWw1453hIkvcynIN0Lc3wBF7EOrkOkxJmhDsbFjJFuWK6DtsaNhhSGmB9dvhd8SAMVyN-eGCChiztU9iMu7QmmwOXjSH3bqJ6PVRA9hj2xZFfdwV9Wez5BxRTx_QY5BlPDsWODuL-mRKkX_4eblW1hzYuEoJDnjh0c5QLi6VVw4rWHYKgOtte49HjCo21NY9c0RC5B7aOAvxyuaL8ybjng_Z-RXX0-EKNiqoLRSffuhn8PmvA-ffqP65-EfoN9qVPYdTAbdjOIbpYdOb05lA=w2546-h1534-no)
Title: Re: Quad 303 restoration
Post by: HB on January 12, 2019, 04:05:27 PM
No pics! :nfi:
Title: Re: Quad 303 restoration
Post by: mygoggie on January 12, 2019, 04:42:55 PM
No pics! :nfi:

This is silly, sometimes the images work and sometimes they do not. Sorry will ask @Family_Dog to sort out._
Title: Re: Quad 303 restoration
Post by: mygoggie on January 12, 2019, 04:47:22 PM
Let me complete the load board construction here.

The next step was to solder leads onto the light bulbs. I use my favourite holdfast which is a corduroy bag filled with dried used coffee grinds. Here is the first bulb in place.

(https://lh3.googleusercontent.com/DPce0JVDwVj5Tj2mIhBQbX6lsc0Wmw7MMcUU2Jqq1mq9Sd5xDe3PIc2sDh8IGt7IcVsn3yVnHX1BaeRCvqmMteK26nXBorxztxum1QK8GPsQtS3FIbD8a9YOi10pYkbwTiNBRIKO_0D7qPSJpJBGMWQdTD4SRgNIqmvX7RkPm6JwnWJL7XDa0H1WAxfy7qmAF79CIWXSw-yNu8e47NUJRrtySO5jHMrXM2NXEXBNM570z6HH5A4popxUl349SKsiY5JrcNIW0ZBvudt7nAi7egjeEfvrPtR0AyE2eee-51njm7JzE4OiS-3zogINT964jvDZUrgFv5SJ0DWNO2A8wkaYovS2pdJ8gbAlxJj5NFzEZtfmd1Dtjs5CS0U3q7gKziwI0yDY3pf3VC0-_g13Pkv13uKCFVoo36w22Qcbojz2mi3c01QXGG5H3TrUM_-9nb11SMZ-29R1gkzX9Tn4UuEECvN7Surw26FcEBlZUCRqWwU3VA1tHxQ4vd-0pWFimojzlH1ZFd6ugoW4FDI_zNZKek_6Phk3wZVQSmAVFKil8Bnhh7icFppCs00Qcrx6sZZHuduYC26YyxmJ7uS0QYZ-YtyDTE9vmD1NeFnvef0MQL4CxQzBn0IoMDJXHa7_Nq0MCwUShyGZuhpeYSG6fEHyed4oZzXZOZsKLbttJQYckCeGK43_uxD4M7SueQMVbOMWewPIWYKSuY9bRA=w1152-h1534-no)



I think very few people know that phosphoric acid is an excellent flux for soldering. So here I run a small bead of acid down the side of the bulb.

(https://lh3.googleusercontent.com/p4X5A8aery5Bjn36vA-FFks0AVUSi6lLV9tapz2u0lgCW8WJqjIYFBQgMPRyL35UXO_WI2XkzvC3-bZhCYDROGIY5U8h5MPQo4SgpoizP2cwpPBnNBY1QSOzDysF5C7TRzYtYuujrW0aDclBX13x17NbAv5XVzEVo8IkW6pykS_lfFuAbS_Ef0j_w9GmV_pt9dmMat1CLIkc6WymNp4Aqk0dePe73fEWzrYyhOrzywblp6f_0KJtGpd3-khW4PitNutACiNw95DHcIW8ZZs3i_t6MTMnZkAgDZ3i05dAfJYHEn9jACyUryCKac0hbrk1SiVbJC2nTlxIuQdSgs374sVgQ7B8X7tyc2-zX1QjN95m3R-HDklxF9aKDVz8_zTNAvV6EoYH9_eMj4htb1Xlyu21fJ8kE-uVzlmprZb80AjTXCvLueuqOW6MuTwyD0c8Cc_bWcvMEelO06_ZVSCwWEysaDCz8qiOe7YNu66Gq0Ffb3g1u9yuqs64xcQjlZG15QlXoTBKEPzz9aiYFT0j8lYnn-UBlp9lO5dQvdFZ2gKMdK4YvdpEgATGjoglKE9uAswxW1DbCS9DkRSksI9EU5jbEbr7WYLIkhKj4_SPb2kYab2ThfKePKE8Tz1zfaRt_JL2UdnsZzc0r8Jz34Vxb0Fdv9DeychjXZlC2cPkuwn6wJS8msp-nzvsI3HMx2V-fTw12tLt1Ea0Sj3BaA=w1152-h1534-no)


A very quick touch with some solder and it is tinned.

(https://lh3.googleusercontent.com/QDgUOSm6pnsXnKI9blgzFgpHI_uehQV-m-hjiVX0OMyx-9byAEqWSafhORq3_r8LyTkB3b23QfADVJPGRhwCXWeeSyCAjrC3crrvnXg6vZGRigsJDKL8v_fe8ooI-hpRy4EQ9MfiY99DHbcSxXU-802pbTE09Gyz5OKl487KoLO8NYuXHtEZZD44HzLPFG8-RYwPoasfXK_QHe4QMZMLxMeCQt-wpwQJff1r0ij1Cmo_qqAMoQp1z0lY6UsiAYPOMNwYqDVIjTauQnJRplJQWJUCQdzSaibQLBGsRrM6fb_iHZx3Kt0x3xhdlyqbFnJ02LpD5zA3CSjewi5H_yRYWM0qiCGPTlJpVDJQ5XIDshShnd2-_jDI-HL-OTpuGIzndwq082hFaSCWRS01_p_x_SK8FmKDGluCSPjPX9aX6xQ71xEvaGmDAQ1J6iUHc-2WDr9m11VScTl0J08y3hnRmX1-PQlQZC4kGJsY3Kltbho2tS31IkVgota2Rixkt8kHnBF_q8g1tP7IctfK17YCyxPIMmnUArx3cVP6zOBMjRNjNctw7ht8AI2QUNXemw-fWLHE3_3gfeZo_a4-Bztu4IkeMMA9siT4p9wmLDu50rxOe0i56ATYGER5MUf0B6s6EWPm5g17hhodTEAYttGUzWaRlRhxA3RJv9F0neKMNAe3-o_PTEO4at-i05VrvmtS8497VVKZQiGDTJvWOA=w1152-h1534-no)



And the lead is easily soldered onto the casing.

(https://lh3.googleusercontent.com/LpSdzb1LTg9IkbEC2aCT9CCTYAk0sYPfqoRSBlLzsXZ69H-RFaoNEV5AmPc6Lp2rT83YNQgXbqpP4mfx2F0wIYfOiOcYBfswbEOe3oDFDp5Wwky-JbfEYyL0dOTYQGJALgW7u-a5fCc96DDq9Ww892lAD7saeS-_Udwcvmdp3OB3WD21tBoASnVcDZjnZsoytSTG_AJINoqG2eAFG2Z_7o6yPxpaUGb0wFU-yc_wJJm0rEzHeHoFndEsPRTIP6SmP_iZtowybhw5lXKHTDDaeNRRDXOvIAf-v1M5qv9ooz7we9d254xuRCC4Egxlym7JtVUP2JVam7jdbiZotwPXOp-Vk8Mv3Ma70UWEp_XEadjxFZ6vSDklQ1GfG-by9ArG5keAmkQDCkoOeqghjG2LlR-XE-rirAtZoGMlj92dnMQohek4Fbq0ylypwAB2hjOnhXIINbcowWLNdkp6bEtUETB1CccsYVDIBxt1ZyDLCjLBBHSOd9sMnEHFrzs44RnoJG55dDgR-J2wHrtHxDXlzKd1BFNgrX_w1sAp-RMKNYeUlJIoFln5Vt7ok1v7P4LEPCMlXqQ0QiGQzsuVOcA4yOLEuKhH_ovDCWbd5O-PyC0WABn7PPfsMn3SpA8TP7A_GChyquf6mtrmuP1NfujMYPqRLtMGpKcN5bL7k795KzUSgM7ouP2ruMqDbUuZb9hNgk_EMQfMBBp7HX76Mw=w1152-h1534-no)



I am not a fan of hot glue, but today I decided to use some to keep the wires in place. All wired up and as neat as I want to go today.

(https://lh3.googleusercontent.com/BwsXr-ze3iZNXcmGg8Qe9ssUYUoBGgFFvAxgFKrQ11Pan834nCTyc1B6X58q0dwIFHnmUXK9kMp1Q3aZBrsqciplEi3V8Xgjy_Wv0KihHq1XSbshQhRSrUFBahBKuqW8yFuDb-J6HG_dtgP0oO94N5RWQuI9KF_PV-ewARfWFhmCR1rp5vUG96Dmtv04DX54sFCVM6w1L1uYq28e94bKSdaBSZ8Gjlh0AjAtR9Ff2nHSRyZoVAC4D-VzctLGNkmsJmqXJa83Le0jBd50Mb6QL0NgGzPZz_d_HeXNDEXdjTpzKlEDXDG55ifQmfBZtQz_h102cN4eseKg4m73cIwPnHei6e4zViOp5fK713G5N1tFd-CAmbSd39-R-VZMvBaRJananiydDV-z2RiPoNYILZNNdsb-xCYSCm16bAfyilJrvv3rKsbMdjpRevBLMiZ6WTFJn-MTLnRpjrN6dVykKgEJUm_VlxvuEoQSlrIyFWs66K37ANZhEhiG2pDaZOeXxeAiEUXM4iD1OjtzfUO40oaNAoMXaAS8Yr5_eF3YmtWhS0a5pNzdhtw8-nbdr1tJ07EO--xxDdXAxmxeQ9mftKVG4kv4uiYJTs2U9eA2DaWv0ZjK2Lv71wVZWSUvXQv4HSVIOgeSMlvzwCSjBd1wReM1XFaGli-XkoWq6XK4c5bIMEwXfEkadIMeKrqWaTa7qIVsq4VsQVLbN-vXGA=w2046-h1534-no)


Topside looks good.

(https://lh3.googleusercontent.com/vi6AdIIrBIGD47jdqHXpy9u01-GyQ6tgX4xVnGs6_tHQ4ntwycUWWNnYPkA2uVekGURZrWS1UE7k4dVwiYoAYgz1UZA1pFFT0WKxnFMZH2rMqSXfE2vVdlxGsb_4z7UbW_WBpxt9qHtGm9eTKVDDWElrT8nFjs1FGq2Ni9jGPmpGlszOMs1dE6GQCpr_HnGTf5kGy43gucMOiDwq2ZKNXqYpsaDl_3Z-qZz84_wmqhjNAzTyLxElORKZH_4mpM65VHf8TpS4kp4rqsqh8b4CSEorLftEVeU-TfPsYGoGkhU5IR6K1MwPLWX_2e9xTq4rEB7m8tK93yvKZY00RZ7jpCcyWnYftU4TsNy43vVuGNr2GzwgonSeIl6u764VaNPwEpZ-aAslmbid3tcjTvSWGgaEIq_UFgZ6cQf7XvmUpceVh7Lle-riyfEjrUb4qV9eHInCiKLF_jp6u4pZT0D9xdjjmSOaAyUrmpVRrMxjoWJbfEGC7FZ7zgZp4xtOLg-hz19z0ml7v_xD1b78QUrGM03dAWTFFzekNb3ZPCfkXnJQsRRq5M7a96PPYZlxECOEF35fu2x_7SEyrVkv77fnjldNus-rzGx5bPe4B_Hep48llf-0S74Qi_-itc3jMAgS3N5wjZexXbe6hrzatoon5N7nmbCQoyDYB6gMbeC7wI0ck7hgCbbleRQNl4ugycraCJGJvwM3rIl5-Iq7HA=w1152-h1534-no)



Glowing well at 30V. Yes I ran out of banana plug. Using the Africa way ....

(https://lh3.googleusercontent.com/1b4qxoCdkJmRdh1q1nsEpwgLoNM8kD65m-Dvi41g1d48Eh9FCzvAdFl6geusZSR5jGYUqozoyZGvw-h2oIUP2Gh8HRvXxWKV1NsZaYWlBj3Y9np88vZJoalSaJk9BxKyogZsiD8s6_pcaJ8Lp2Ai_7IBUbl1cGy-zJvUnt7Zl8orit-Mi7WEatYOvqS99hm-yWhEW36Rlf4KiTUdZLqWkDlknuTL6hlbYJzrj-L9l1OTK5-6mrZ1Rc66vCpWSKAol3BCuSjmKAGVSTecwPbc_PsEjSfXfhdHUvI6-EX_5sQLtw1PV2LJyKs0E1MG46pGNFYAc_WHvPw78DYDPNaHhIxCIumvsYDXDgEZw-13PfcDtmGBuV1p1OEyD9KCbgnWadvvvv1k8zzqO-LZ77st-lYbTX1I5wQJyW_GEhrKUQovF-qxQpGHFyL6KFB9wAd87dXoALYd7zVvR72D2lg-plfUxNl5mztiTDa4-TtOsnk1M8NMSZNGmEfBzoto_L7gbM3zVDjBupUaCjrYm-8nSBNbwk3nfgVN9F9yC9RN5y9_pVl9GjniVuhqgtle9rawolOozR3bicuO6HOtVVVGECEHltw40IHfUmI6J1gJah9XFz6KkT28O1Ea_yGuGbQdUWUeEXdGAsngKrRYTLnQ-eOIuC-mY0UnYjQUnTB3Qdk8k9q8PAIWdc7OKCJGnkknaIQAA6QmLZggKOBVtw=w1152-h1534-no)




Title: Re: Quad 303 restoration
Post by: mygoggie on January 12, 2019, 05:04:33 PM
I made a design mistake and I am trying to figure out a solution. I forgot that when cold a bulb filament has almost no resistance. So what happens is that the transformer is almost shorted out on secondary when the cold bulbs are connected and the 220VAC load protection (current limiting) lightbulb burns a bright white. When I add in a 10k resistor the current limiting bulb stays unlit, but the transformer starts to hum, meaning it is in overload.

So if you have some idea what to do let me know. I know there are a solution where you add an electronic circuit but what is in that circuit is a mystery.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 12, 2019, 05:46:50 PM
After searching a bit I found this thread (https://electronics.stackexchange.com/questions/327004/incandescent-light-bulb-soft-start) which looks like what I need.

Now to figure out what I need to do ... I am still open for ideas!
Title: Re: Quad 303 restoration
Post by: Family_Dog on January 12, 2019, 06:16:41 PM
Herman, the second pic link you sent me does not work, I replaced it once again with the original link, and it shows for me. But then, so did the original three pics as well.

Something does not gel: When the Quad starts up with a normal Bridge (?) rectifier and smoothing cap, there is also a sudden inrush of current - momentarily - while the cap charges. So the cold starting resistance may be equated to that as well, it should only be a moment or so and then the five globes should be glowing brightly.

Adding a current limiting resistor would work - but 10k? I would go no higher 10-15 ohms, but it would have to be a suitable rated wire-wound resistor of around 20w minimum, it would only need to be in circuit for a second or two and then you can short it out completely. (My figures here are not calculated, but thumb-sucking).

The load you are using (sans current limiting resistor) is 105 watts, what is the wattage of the series globe in your AC protection circuit? If 60w or less, then therein lies the problem. If you do not have a 100w globe, substitute with a fuse, 2 - 3 amps in the AC side.


-F_D
Title: Re: Quad 303 restoration
Post by: mygoggie on January 12, 2019, 06:56:02 PM

Adding a current limiting resistor would work - but 10k? I would go no higher 10-15 ohms, but it would have to be a suitable rated wire-wound resistor of around 20w minimum, it would only need to be in circuit for a second or two and then you can short it out completely. (My figures here are not calculated, but thumb-sucking).
 

I know, that was the only wire-wound one I had and it was just to check if a resistor will make a difference.


The load you are using (sans current limiting resistor) is 105 watts, what is the wattage of the series globe in your AC protection circuit? If 60w or less, then therein lies the problem. If you do not have a 100w globe, substitute with a fuse, 2 - 3 amps in the AC side.

 :facepalm: you are correct. I forgot to replace the 60W bulb. Will check now.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 12, 2019, 07:26:47 PM
Transformer inductance played me a curved ball today! Thanks Eric for assisting.  :dop: :dop:

As we learned when I was young: "If all fails, you have overlooked the obvious". Certainly the case here!

I added another 60W in parallel to the existing one in the primary 220VAC feed and she started up! As the output of the isolation transformer is fully protected with a 2A circuit breaker, I then removed the two light bulbs and presto ...

(https://lh3.googleusercontent.com/B9MgskjSiiBNQkUnojS63x89mLpmrBROmHhDoD0ueAwe_TDAuadS4wR7VW04TCyUVIUF0s_rLFsdSN2abY5-PYwTWcngnol0WELb1Yry1dfFv6CGtegNccYpO_D6DHDMkt0GMxIjAP_lEDw3iQmwTz-2eCDLhQwPM_h1AioNhh-HA0_j3XcP_BeHsTQwKRTOtOA_XzVwVZQ-WGDkUPT9IruXMkCyQZLFM9kIKPX3_mojNlzYCbZh0QZO667QXVcz5Goy8YREv2SCU6I4uyozWlYqVu9SfgC65q6kP63i6mIX5jO0Rwqt5Kxru9Y7Ql541ytxWTWKw4N_FnlDCH3vJajizXmE7xBJZOiMSKbOpfxAbWBHbhIXfepyGI4ZJBkOPc6bSYGIgKNUSDDRcMySrXwFSIMKkmiOkt5J0L9VWhYKYx38sGLsRxOFHLzx6vw3DjAsIyjgIZ_vyfdoFNh3ObrGIeCztCqUCa0UP-GPMz0HY6B1sQBG44s7ScAdzHIfVo1VnBsu-N9y415ExjSAj-Klz4mDpjX2VmISpQyQgQphDecamjrbbDBmUIgOrjREaVFrn64uX7Z_ISSMyP8rxWNJYjuyt2eIX4k_dbJOB67Ft0ds3Wc-UaXUbhRJ-RtYi7DXu7Cow_Q6dzAgk-nxxF8r9R_AqRd6wkjODFkkFn4VC28WNQmRxH6JG0-zps96rCLKv7ksNAFiiT2B3g=w1714-h1534-no)
Title: Quad 303 restoration - Transformer
Post by: mygoggie on January 12, 2019, 08:08:30 PM
I left the transformer running with a 105W load for one hour and listened to some more Blues ...

A quick check on the transformer after an hour showed the secondary voltage has dropped a slight bit. I then tried to determine the temperature of the transformer, but it was so ever slightly more warm than ambient I had to make sure again. Yes, it is a little warm to the touch, but nowhere near the temperatures I read other people experienced.

As I switched the transformer off, the first bulb in line blew. I read somewhere this can be the case. Not going to worry about this.

Maybe I will add in the extra four bulbs tomorrow or maybe I will call it a good test and go on with other things.

After one hour she is running sweetly.

(https://lh3.googleusercontent.com/BoZpvN5-1EW2Or7Im0DDRPoMgo3zUwP2qwBKJRIqDb57XlIaaszDQ_9NFkY_nKb3k_ekNHILnJ2PwaelNL_ySY1yexSQuhQ8SJIAWB5dxsW6vbe67NhMlJ-OCrYz-8LEoYRbV7wzw9EELlIWzi7cC8EQylB8dcO9yCDr6vnayUVxbJyfUHE9qxoy70TPg-V6XBwN91GYTxm46pmtyd8AO0JnMv7I_j8UqVtR8_T-x9B4j8w4oUp1dcrF1d27NILmNu3HNKxSGmKRNUhktBBVVv_HuhN7d3xtRrWhFEcCeN1y0RdA3dVp_RNrWzNtLpqpiJ-cdyaiIIo-EqHSzBueGukbwi9s9s6zy8ACvo9uSyfgr9nq4JfmiUvJvryDTnkxB7nLiQLZsTaUFr1A77cyg7-LRl2SRsTCyM216JE7Uyy1kfl0scNCwFsGYkoTblF69Z8NqebraYyVRIV-N2IuiHlc-2oXF-Dhgx2gAFAVhcgxY_oVjBOfqJZKQ0PlWu76pEr5nyjgp7OZdtG0np8j-UkfXd9wplgyjjbbsAefOe483ocuebbFZMCObmyHHNBiHpP9hZJ8lwGWkgZwxuMicR6GmlQwG1FW23BWJfY5vN2_p72Yt3r5NOoIyA6vCqubDdibQvmVSKDZTyZNurp9BEfTNvBeaxWToduRwRMoGeIe_q4-MY2mfjGZEVFhaeJQQ8xy2IB1ehuKnnEDOA=w1152-h1534-no)
Title: Re: Quad 303 restoration
Post by: Family_Dog on January 12, 2019, 09:31:24 PM
Good show, Herman. The lower voltage could be as a result of a lower grid voltage, up here everyone is running air-cons in scorching temperatures. I would think your transformer is completely good to go.
 

Pity the pic above is not working though...   :teach:

Send me a new pic-link and I will insert it.


-F_D
Title: Re: Quad 303 restoration
Post by: mygoggie on January 15, 2019, 02:09:42 PM
I have not been feeling too well the past two days and just slept. Anyway, I trust I am getting better each day so hopefully I can get to the paint mixers tomorrow and get the correct colours mixed to spray the external metal parts.

Look what arrived yesterday! A member of the happy Quad family. It has some scratches on the external faces, but at least I can get the correct colours matched.

(https://lh3.googleusercontent.com/IWY8dUqeTRpsBKT4qBD_yJPWvbazb1UYmwr93CuZ6PQSbyMQAb5dsQvZeVqGimVGgk7_fU7LcgE-nQsy1en8lGNBZidxIe2frnHO5QmfQ7zLFi7ehxKA4RTGXc0IzoWcIWOrYDVIZdBvRDVr-XMOOrPA9TZS8I3fyNfIaS3K8foX8RCwxgnxomWutJie3ji9wm5F9zVSs2PltYY8QdmIimrLkrrvIccQMgPMS7kwdIQaFGtKwU5IIXbg4xfBqBjZb-Gx9zAAMvLSdZ0FQT6rugQT3V7LTgb4qAbSaNuu6Yyv4fG8EjBpLhLB1x4aLA_DJ16o-KRwANZeVfld8wfZiEOoiFx7ghYGaNunrBog6SWDot8sf8O7xEv5KV9fsRii9suGEZGsJzpVssQEPj0suSm5tJ_g1gGW4RTpK6X02ZmD1hPNlkktqwyrHkm8drJl57u6oDQmlzaMgo2CnmdEesitFx7deCnGxbBEykQDHdssPQ9ief441vjaNA3E2S9CzOreWnBkqok8CtfDlxM5zn7jQ3NEsNdIlsub4KqVjOGz2FkFQuI0k7q7bqr9eJqkc-mKYLEI5-Zht6kdLe414CGy360jTJtdheY0vgZlYIepDo8uffvI_e1EtNenZiaQApzSpGKTiA9zH1n7mVf55YyI-kRNNpF_hIq0-sBlQtEV8GeUTvXy3Af6__SCBNQ7810AdF7lZrphtABTIw=w2046-h1534-no)
Title: Quad 303 restoration - Regulator board PCB
Post by: mygoggie on January 15, 2019, 09:03:18 PM
I had some energy tonight and amended the regulator board to accept soldering pins and accept a multi-turn variable resistor as alternative to the standard single turn version. I also added in one track I have forgotten!  :roll:

(https://lh3.googleusercontent.com/8nTKdool1qX-Q2nD6TEh_APeoxH-x5vfDmX--S3xIFI3w6czXv7KcNY52ATMsuIyMb4J_HtiLE8Nptirfcz_-NDyk6Tza1dCuilNbbUQobcqXgIAeCqSfCMM5fb3XgBI8Liajtw2zDWIwWj58GHZ_jrJ_sUsZ1EtoYtW45dV0z0mONoj8aN7VKa6dQLa0y5xU7SqbmxIRD8Frr8-GW2V7D3U-y_0ZF65u1sAxOmyH9GYuMvN4B-Szj5jRq6MGv3QWGOrpnrVJXQHpu6NCVEzvtrykRQC_85I0vPlGFSUD-l4NDjCLIWkdPowdT4zsBXBuJnWrTAi6abeyVS836ES-KnT9Ab7HcCnrKU4AW4l9e9_XMg8iaSSNZtu-2YN4Jxb2gGpcuDfZVN5kP_fCiAlvKQeDw4YbPHEKXJTEtK12Q64Kz3mlRd--VuBAmM2brsuCQxvaAU4VJ-kUPtIjt8pPEAnjqoHH-mXT1GS5eNM3JL_5zVAy4fgwVeOBybm-xrLRD6HylaRS0FiuxGjL9_G-V3o-bflIz-8p_z-EsGh2IuL_ICavEtoYczIMUQxMp9GuUpxo-bvfbf6F1Kb5iF9Qmt59794ivVdTrTDLyn6YQUgm6oZgOs2qDVrhjmw3iZLwiNheAdCZCbLkfNe2VylmboDjTQGNCkug_2f-hXE9LaOzBwOmOAxYKy4_iL5usRmMUTwfHbkf5QQgqESrg=w182-h448-no)
Title: Re: Quad 303 restoration
Post by: HB on January 15, 2019, 09:13:16 PM
Brilliant!  Now go back to bed.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 15, 2019, 09:16:41 PM
Brilliant!  Now go back to bed.

On my way! On my way ...
Title: Re: Quad 303 restoration - Regulator board PCB
Post by: SeanS on January 15, 2019, 09:50:28 PM
I had some energy tonight and amended the regulator board to accept soldering pins and accept a multi-turn variable resistor as alternative to the standard single turn version. I also added in one track I have forgotten!  :roll:


is improving things legal on a restoration :)..  :giggle:
Title: Re: Quad 303 restoration - Regulator board PCB
Post by: mygoggie on January 16, 2019, 08:29:47 AM
is improving things legal on a restoration :)..  :giggle:

I know you are asking a retorical question, the answer of which I have pondered on. I cannot get the same phenolic base PCBs as the original, nor the original transistors. A true 100% restoration is therefore not going to happen. I would rather see a component fit correctly on a PCB than having its legs spidered to fit into holes not designed for the component. The following question then remains: "What about the projects where restorers use metal film resistors instead of carbon resistors, using higher valued capacitors etc"? I guess I would rather have a better sounding Quad functioning within the original design parameters than having a working one using old components and sounding lame.

Having said this, remember that I also need to accommodate the presence of the ladybird which I guess also nullifies the 100% true restoration process ...
Title: Re: Quad 303 restoration
Post by: pwatts on January 16, 2019, 08:35:13 AM
Having said that, those horrid old single turn pots are awful, inaccurate and prone to major drift.
If you really care about jazz like sonic signature then metal film can make a difference depending on system resolution, but since you will replace those ancient psu caps with new electrolytics with very different parameters aside from voltage and capacitance it anyway is a moot point. If you mostly aim for a visual match, for the latter you can of course carefully open the old cans and mount the new ones inside them.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 16, 2019, 09:50:52 AM
Having said that, those horrid old single turn pots are awful, inaccurate and prone to major drift.
If you really care about jazz like sonic signature then metal film can make a difference depending on system resolution, but since you will replace those ancient psu caps with new electrolytics with very different parameters aside from voltage and capacitance it anyway is a moot point. If you mostly aim for a visual match, for the latter you can of course carefully open the old cans and mount the new ones inside them.

My points exactly. This pots are a pain to tune perfectly.

Thanks for the idea about the cans. I will look into this, but I think someone replaced the old ones with the green ones as in the photos above at some stage during the past 50 years.
Title: Re: Quad 303 restoration
Post by: pwatts on January 16, 2019, 09:54:47 AM
I just saw the green pics yes - perhaps Quad, like AR and some other companies continually changed the product so it may actually be stock parts. On the three 303's I worked on they were all the shiny aluminium cans though.
Title: Re: Quad 303 restoration - Regulator board PCB
Post by: marantz123 on January 16, 2019, 10:15:27 AM
I know you are asking a retorical question, the answer of which I have pondered on. I cannot get the same phenolic base PCBs as the original, nor the original transistors. A true 100% restoration is therefore not going to happen. I would rather see a component fit correctly on a PCB than having its legs spidered to fit into holes not designed for the component. The following question then remains: "What about the projects where restorers use metal film resistors instead of carbon resistors, using higher valued capacitors etc"? I guess I would rather have a better sounding Quad functioning within the original design parameters than having a working one using old components and sounding lame.

Having said this, remember that I also need to accommodate the presence of the ladybird which I guess also nullifies the 100% true restoration process ...

Metal film resistors will take you away from the iconic sound signature. If any resistors ( carbon comp with 10% tolerance) measures up to +- 16%, they are still ok.....but beware that sudden heating from a soldering iron can increase their resistance. I have used heat shunts on the leads to minimise this and protect neighbouring cc's when removing one.  The most affordable replacement would be carbon film (CR series), half watt rating and higher, dont go with quarter watt. This will keep you close as possible to the sound signature, pending only neccessary changes of resistors you find need to be replaced. There are new-generation carbon composites, but they are so expensive! I suggest keeping it carbon film, listen to it for a while...and then make small changes to metal film over time to see if its what you would like...if u really want to go this way.

Ladybird or Ladybug ? If its your ladybird giving you issues about this restoration...then u better accomodate her...couldnt be too chuffed about baking transformers in the oven either  :)
Title: Re: Quad 303 restoration - Regulator board PCB
Post by: mygoggie on January 16, 2019, 11:36:58 AM
Metal film resistors will take you away from the iconic sound signature. If any resistors ( carbon comp with 10% tolerance) measures up to +- 16%, they are still ok.....but beware that sudden heating from a soldering iron can increase their resistance. I have used heat shunts on the leads to minimise this and protect neighbouring cc's when removing one.  The most affordable replacement would be carbon film (CR series), half watt rating and higher, dont go with quarter watt. This will keep you close as possible to the sound signature, pending only neccessary changes of resistors you find need to be replaced. There are new-generation carbon composites, but they are so expensive! I suggest keeping it carbon film, listen to it for a while...and then make small changes to metal film over time to see if its what you would like...if u really want to go this way.

Ladybird or Ladybug ? If its your ladybird giving you issues about this restoration...then u better accomodate her...couldnt be too chuffed about baking transformers in the oven either  :)

Thanks for the good advice. Will stick to CR series then.

The ladybird has been very accommodating about the oven as I always need to fix it when it breaks. Pushing the limits though when baking old hand planes and tools with a new coat of bituminous based blacking.  :cleansound:
Title: Quad 303 restoration - Capacitors
Post by: mygoggie on January 16, 2019, 04:48:13 PM
I have been thinking about the sound created by old tech vs new tech. In my mind I should therefore also stick to old tech capacitors and NOT use audiograde capacitors, but very good quality industrial caps.

Would like to hear your opinion on this.
Title: Re: Quad 303 restoration - Capacitors
Post by: marantz123 on January 16, 2019, 06:33:28 PM
I have been thinking about the sound created by old tech vs new tech. In my mind I should therefore also stick to old tech capacitors and NOT use audiograde capacitors, but very good quality industrial caps.

Would like to hear your opinion on this.

Its a given that electrolytes and di-electrics have evolved over time to accomodate better efficiency factors, and two main areas come to mind on this, namely Electrolytic capacitors and non-electrolytic. When it comes to new  electrolytics  in power supply stages, their influence on a sound signature is marginal as compared to new (types) non-electrolytics in the signal stages. Improved dynamic response is inherent in new, settled in electrolytics, this can be expected, but changing for example, PIO capacitors in favour of tighter tolerance polyprops or polystyrene etc in a signal stage changes the signature to very noticeable extent...and newer technology is not neccesarily better or sweeter (sounding) for audio, but well may be suited for better precision in medical electronics and PID control.

Old technology resistors, specifically carbon composite, have excellent surge capability and impart a sought after warmth in a signal or dc path bringing  colouration and musicality, enjoyability, which is pleasing. New metal film with tighter tolerances, ppm drift/temperature specs etc. are a very different animal and if not carefully thought out can leave a once musical amp in a sterile sounding (more accurate) condition. It comes down to what is more pleasing to the ear ( domestic use)...accuracy or musicality/warmth. So, new technology may be excellent for other things, but not always pleasing to the discerning ear.

Even semiconductor technology has moved ahead with the old warmer fatter- sounding Mesa construction ( type) transistors evolving to newer designs.

Title: Quad 303 restoration - Regulator board PCB
Post by: mygoggie on January 17, 2019, 07:52:19 PM
I have been quiet the last few days mainly because I have been to doctors and donating blood in volumes to the lab. I do not have tick bite fever, nor any bacterial infection. I do not have malaria, nor mono and the results for dengue fever is still outstanding. I guess by the time they find out what is wrong with me I will be healed ....

I have asked around to determine who in SA makes prototype PCBs and so far found only one company. Alas they only do epoxy glass FR4 based boards. I also adjusted the regulator board design to conform what the PCB guys want in terms of artwork.

Here is the latest version

(https://lh3.googleusercontent.com/Hju9QDFmyO5HECfeIb5KUVI6_34VF6r3kqnngRR-s8t1EUSiNbaO3z2lAzobMfrkBoIa6d4yCclgN6Ev2hh8fjJJM8-NX26Ql_CXjg5y7jsCZYP2n0qm8PoYJXrPoLVeZYeKtWn05SV9eJ7RTVOKa9NlWV4e7Z1eW9RK5vwi6vmIEkQOWOv22hn1ZND0ewKB2WjNBULKYoYjrOcLuiLx6QLkXCXrAnhRBoRSKnS-3KIOd5Eqags9ZDNfSIWSjWyDB2Kxuzl5QooJKT5I3hKCpd7ScflVz9_dA5h3g6bwnhjqluU780DToyv8JutByhnt7UIWZvboObfN6QU3E8FSgsQSuhup0RPAYOsLdyO-tQA1xT9tGt5Gb1J3gH3KbqGIi91TbD39_V5jTIDQH_BbxVgjBvG7SrDc7g3Jij6bpU-RZFqSY8h_cgd93Jn2-lnhDCCjaaCBHBCwSTD0egrCHRXgWraBUc7Ffbs-Vj0Zr_fuQy5QF8USb8JzLQBg8d9VN7sPuKWfC0ALGDa9kXMUu5QDRoKCFTlhqI3DLEr8rbiDurEDNAmC8zAebOg_6BzXb-S2_I4ItSJyYCusN5Cy5DsufTEBXKAx7IXuAWcQy0DkqIj08HDkSBOER-bMEHdTko1J4TA_aVoG-JI63O6cJFkfgmnC_j_nE_iag648QFKNHtaQzqP_cl4GFlM252F8CUTiMX6Y0RdWn5ugQA=w214-h478-no)
Title: Quad 303 restoration - Capacitors
Post by: mygoggie on January 17, 2019, 07:55:41 PM
Just to bring everything together on this project here is a thread (https://www.avforums.co.za/index.php/topic,75918.15.html) regarding capacitors and the meaning (in real life terms) of a lifetime rating.
Title: Re: Quad 303 restoration
Post by: pwatts on January 17, 2019, 07:57:14 PM
Ypu should change the ladybug to a tick as homage to the dreadfulness during the restore
Title: Re: Quad 303 restoration
Post by: mygoggie on January 17, 2019, 08:27:54 PM
Ypu should change the ladybug to a tick as homage to the dreadfulness during the restore

Never ever ...  :baseball: :whip:
Title: Re: Quad 303 restoration
Post by: mygoggie on January 18, 2019, 05:23:08 PM
I just saw the green pics yes - perhaps Quad, like AR and some other companies continually changed the product so it may actually be stock parts. On the three 303's I worked on they were all the shiny aluminium cans though.

I was trying to find the cap specifications and happen to stumble upon this thread (https://www.avforums.co.za/index.php/topic,18612.msg234774.html#msg234774) on this board.

So yes, these must be stock parts from 1969 onward whereas the aluminium ones were used from 1968 until the green ones replaced these.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 23, 2019, 10:04:22 PM
This time I think I passed PCB design 101  :Whoohoo:

I forgot to check the scanned image size with the real world dimensions before I drew the PCB layout. It was not a simple scale or stretch exercise to rectify as the paths and component tabs would also have scaled as well as the ladybird! And that is a big no no.  :nono:

I basically had to redraw the output board from scratch and this time I also allowed for the new connection pins. I am going to pimp the PCB a bit and chose gold plated pins!  :angel:

I also allowed for the optional installation of multi-turn variable resistors in the new layout.

Here is the latest version, I still need to check it against the original on the light table, but I am sure all is good.

(https://lh3.googleusercontent.com/H0dENGY20Ypkd9y0hWfDVEpxP1vrrd3l0Gab3mQphro5QCnuQSM6-kYR53FQ6ihtw_Nzv0cG8nafYh7mN9bZ98mvEk5LfrKUVFKPBnaLLiN7RXmHFxI1BGmiRbYZC7ifXTSLqfYy6SKBcWH2epVfKc2pTu83bLIhFuEERvC70I0fa74Yw2E75dhT3X9RsFNcNEb8RJ2wjDOC2ECqwjT2VOIBrjDliU9sLkcNg7TggAdg1lr9FtVdjDkrAthc04Fx0ZSY7YTDZ9RHwdOrl119qktIDRlPqnVi_yZU_MfeRk_aOjLN_bDrudIX_Lpq77Qsa7YMXuawenW3ZAH5EKYm0lxKheBMo-x2ijyQwVQBcLwuIotwMZ8_MJnsp18HF3LovaYr5mQevRnSWoNgNBbZ91LSviXbYPdExAxMNrT399OYoLXLLgWfw0Z8cJ-gB5IvDTWFkMGqViOmOWZQ9pmEvclcd8undB5fE3GXLzbSTXv2ysanwYP02-rxtET7iTb30Uei1oqoNvWGPIzoRkVaA-AT3QSe26CnjS8dMoyWUY79kvxsNm3MPtv8jpBuuy10PvEK_YQP5WlSFc8pSSrIVKz2z0foNw4ETgc2KOnR8LvdJ-tADPiudpt8odzPRz2D7YnakBm211Ng7Gu0EJbChvdu4-4nuc84wFJo25jD1COL5icl38TB_xl1_rWtWRAc-iBqaaO87eA0tsw_xg=w379-h481-no)
Title: Re: Quad 303 restoration
Post by: marantz123 on January 24, 2019, 08:18:30 AM
Once again...about the ladybird thing.....I know it flies, and maybe because of this it classifies itself as a 'bird', but ...it is a bug...which also flies. Ladybug. Unless it thinks its a bird, or wants to be a bird when it grows up..or by some slim chance...was born of a bird but came out as a bug and knows otherwise.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 24, 2019, 09:08:53 AM
It is only the otherwise Americans that call it a ladybug .... the rest of the world calls it a ladybird... so I think I will stick to the bird version as bugs and I are not friends anymore.
Title: Re: Quad 303 restoration
Post by: El Sid on January 24, 2019, 10:20:07 AM
/*Suppress mode */ (Completely unsolicited and pointless whinge/rant about the creeping Americanization (deliberately spelt with a "zee") of English generally and SA English in particular, of which "ladybug" is an example)
Title: Re: Quad 303 restoration
Post by: mygoggie on January 24, 2019, 11:40:56 AM
Today I wanted to remove the serial number tag from the aluminium end piece. I have given this a lot of thought the last few days as I did not want to damage the fragile looking plate.

So I decided I will use my trusty old heat gun again and heat the aluminium so that it expands a bit and then wiggle a sharp woodwork chisel in under the plate and try and see if I can get the rivets out.

Here the end piece is clamped ready for the heat gun.

(https://lh3.googleusercontent.com/ev4UZoDEjXvoJ1xfzn9Xx67AWTwWrZIu2TJPjVO8daoYJJ-vodjFoU_XUkyi0jSnOqJ3z8oX57amwDzsSwdYBsYkbbTOmjX9cFqPIKBqSg7yfw9pya6ujgEmzhzbZYzbAfdrwefRCn9yH2Sn5HlJz6Y71CCHn7KcsuGC25ZlDYfI4nqKohdUJH5Mf3p_BUOF6ticUz26TisX2kkpqY9p2sqmBQ9Xft00jRtJI7jXSavARk_NF9naGQ7zZxJGcbWztzEYHOQ6AdbCpPv0htytgIDh2Q4soDVPBagmboZgpDbPzvbBiRUrAT_HBe2nfX80BAIm47KB2LKe2UPKbG80fLWHtBamAXRIEfxT4CID1k8Ixbi3EuUuqW8UWWoS6dlx8wIgL1cA4XJ4t15gfolj-Jko89hLcimij8TDHq9SILVVA_h84TwOeHAc_Lfz8lWG8Kx8p-paCOEQkLNBRGRXZaTl5L_-yxJyC6GjvM75inqtWRcy7ej0xv-aCf_hg_7bfjwVX8xMj3LVIiA_fWS5cpwY0cyRZZWSnbATaiLcLifbnowe1ep3PaRUhtTEcWPzRiKXStwrSBezJECP9NUjT57k-nfx5yGe8dZFersJtCt2uDHH66MN4hfvdX519Bm0GaiqLFzjVgbSK7uK3AtAdlilfmkAEEvgwSSPyRPX8SIQAFG7UBz72eV-paiSnZxa05QaxWuEpWVhB9O4DQ=w2868-h1534-no)


My plan worked too well ... as I put pressure on the plate from below the rivet flew out and landed on the floor .... alas I still have to find it.

I did not want to loose the second one as well and therefore stuck some masking tape over it. That worked a treat and when the rivet was pulled I discovered these are actually drive screws and not rivets as can be seen in the picture below.

A few rubs with a block of wood and the serial number plate was smooth and flat again. I cleaned it, and found it is bright zinc coated and in parts the coating has started to come off. I think I will leave it aged and not have it coated again.

If someone has two drive screws for me, please let me know!

(https://lh3.googleusercontent.com/cxtdz_s6NYRxnrMyjjDicO2WjG-re3DGcCJ-DCI-6tWCQA3OwZjtPyeUYaRtUPaVNnGJ_pjYFFhVp73OwXb1WeQ856KEYbtKOCzzhsLkvc7AQGzJgdNdfnt6Vgf_AgZXx3Vebu6CW93VXRKhWp540NeZWJWhSS1C5PyEZq7rgwAsKPZLULZokd3hhP3oAo0RbE0yrTn-BvbqCDm--V--2kcupxz4lMcBUsmejv8J89UgpX4MtbGuxbZHoda10DMlb8dZSya3I7ozC8DqMgBQkQJrsLqspVrj0YUrSLKdBwoklkhRpenJ_2pN-z3yozW_KZ_yagafGKMWDHq0ZAS7nMVX3bUIloNAMcZQSk6WB7kv4zjQlnPtG2yekZ1MQoDd_uTdtsPeEt1smVC787xbIkXZA29Xr5oZkThKRy6XoxQ5NOnnk43x_Kue6EUtN96S6qWZMX91uz-cwp42502uIrqLR9dXLxz-uop4OFAJn-eg4o_5F_tSyvHlwWnDv2CmfyDwUCjMa7ZSADtTH3x95HxoS0G7s3sspXHMTCuCZZopoO_5BLBkE8yO2GIOBor6EBdcbNZhtcyn_Xzw2O0OHrmoyNn9nObgWZ1u5gg5TS0WyvyTVq2pI8uKLp26q32vZz_JU-2MFueNd10hCfkIKcfLIg6e9WLPV0LJ_dKlpyFKBHmZRKKQX8_hrKX6RH09yNihgeIxhrWsdA1vEA=w1871-h1127-no)
Title: Re: Quad 303 restoration
Post by: mygoggie on January 24, 2019, 02:42:44 PM
Good news, took an ex-magnetron magnet and sweeped the floor with the magnet. Within three minutes I had the hideaway!

And now there are two ...

(https://lh3.googleusercontent.com/HF9j_0EyoBDkoxT-zqG15DIY83VRZI-yZfH4kYE45cxAJVajGf5QS4Uf6urKELq7qij16jgc2I3xKENad93-1RgXtfbvOIasUNAVpXyU_vBD3YOhTwA9XN4xSQIAR3UPQUr1Q7FxNmqAVhoeksExkVDea_3RMf7tkTgQsyR6H6D2RBtugf2N4YxO4xNd4eI9s7nDhdRYDEYbSLIJgJuybcEiI0MmRDOen4wFRA8ZKAfFuSRzeHDdazDAB7s3PvkAa-xugoWkZKmwddBXpv_F3uyRKT2BelGgFgy8Qjt8-qYg9z9hmRH3y8hr4edpdr23e0jX1xc3Z6ojixjFdhPzyqv2tHURi5LKNeDfaYpABou9nxyqt44Q9kmrnr08dz6zLD8zERqyXGwy-MdSaYwKC_q1iNsuTG_VDC2ixC9ufFNSc4VyUgqzFkrJquce0ihPi2GRMJ627udXqQIDzaoorYZrRFeKJ132b6usBZzPMiD6cEBGVcHun2KkDm-2Lu2J4m3PRtYY-6M6NYMqeEHhez7dRYGy-tIo4IqNLrwcNuKX62FCsOrKY8XFx6BMJwCXH_x0AcPOCVnZb5ccc3cx8aSn_Y9JMHkURNkkTHP3bZRqgn2hHoyZP2zEizAkknNk74VREpWmKbJls84Pn34QjZisxAVKi0hrDL1ORFqk45EZSioRtnP1FBBEBNs6BUeN49l9z9I3FOWTrK-_Cg=w729-h397-no)
Title: Re: Quad 303 restoration
Post by: Family_Dog on January 24, 2019, 03:28:08 PM
This pic shows for me, but the two above in the previous post are AWOL... Is it just me?

-F_D
Title: Re: Quad 303 restoration
Post by: HB on January 24, 2019, 03:55:17 PM
Nope. Same here.
Title: Re: Quad 303 restoration
Post by: Family_Dog on January 24, 2019, 05:09:40 PM
Pics fixed.

Herman, use this rather:
https://www.avforums.co.za/index.php/topic,77231.0.html

It... simply works! 


-F_D
Title: Re: Quad 303 restoration
Post by: mygoggie on January 24, 2019, 09:31:35 PM
Thanks Eric for your kind assistance! Will keep it in mind.

Today was face plate day and I finished the graphics. I could see that the original font was Futura and the medium was using the old Letraset and making a silkscreen positive with the Letraset.

However today's Futura font does not match well enough so I found a font named Motor Oil 1937 M54 (https://www.dafont.com/motor-oil-1937-m54.font) on Dafont. This worked in most of the text, but I had to mix in some Futura font to get the correct graphics.

Here is the graphics overlaying the face plate.

(https://lh3.googleusercontent.com/Qq-0XkJAdWLeoU7tI5JqBln4f_d9NOkt6Fiq8zq8hze8osfIeSKS-1WkB1Z1fl2jM0a98cgBP-S7PhRhwClZQK87aj-fS4Mrg6i10sb4BJtPlCwXFGUjzpvhnEk38MNRXGzg0HZ62HTR4bGapCEtczLbk1xQwZVnRl654NgggLfwL1_w59juSnn5HWhYIApZrZckSyf1_3ENEvYBh6D1NlP7ikIX5ALCClF9zjkfqgavvKljV-eweOiyA1-tGTsKRVoZHW9nIUgXK0cAUCYgnHNkWOw264tLIISQabdDQpE1SaGAmveWwsQksftscWJGhMq0AYF14JO4jORhAKlgGOBGnLXi-5NgawB02-qkfdxiOo7szENWeXb2BRIwSUeu_ETwXiUtsJQLbxpyzSMpTlu7l8lrgbRan1KsdBun295J325Yt7p2jjkwRPS_l02ljO6XwJyza2prGbsWGadRN4W6ojIHdgo7wcq9c0DAYfSzdo39LNktE9mqv8QtRB5F1C83ptM74w6W4h3n9gRLpD3cDfSPgfU2fjx-QzMg9gdna0pLJbsYFq_gDRgLfykF7rK2CNuFfu54jdxtIg_m8zpf3z2YzrRa5zwsXAiEKeULR7iN6VOdan1T-ePE-zNjuif-j2bj8bty8n6zQhrBgsjZLuEgclvoWIP6AhOGCbiX-XRf43MvpEjGlKedwnmGyMTR-HJBCAQb9y_OUQ=w597-h736-no)



and without the face plate. The layout in my opinion looks good enough to be used.

(https://lh3.googleusercontent.com/WMOfjEYtBC7OklJKlXkmM-JcjTb5dohnbYcGYsbWYwR0NTdmth6hQT0OAmXvDtb6RNdUD4NX0TC5ZSRpHdT8n_9DNNclpMei0EaS54d6IOej3450v1v0KlfSjgPvdBsADEV3UFVpkyDg9VGcfAUqMGfVofOTKI2D1gXZppMamVJ0j6BmOaCuzQdefKby5x2iGsr44Pc3TYrwGpal0lpFt9Q-rkizzNY03PgclwDrS0flMlhrWfpMcDj6JFZ3CRsVWcVmr0pcIHFzgGdgAEJzaVXW0WMs1sDfPQdFfjxJCqmu23dIGwj6NWwg25P10hLDFYRr5DrNjaRzVxU8ma32NXfcwF4ir4bAKSiu58CtbXaB3-i9Gikjn67kY0-Iyap4ylOTEoUPtRRflQKFV2dBgiL5gCaI_3h64G8-wEPlgAm9V0ktGBczA6A9U8rFUztStMqRHEkNJr-74pgInAcGHUeF69_0ehIj60D5L8SJtrI9Qz1TfAkh8GBnQl-9baWDYjhDb4rRLKQvr9veOzMuekOmU7HJV78JUBiNRIsk2P29KexiTUz-zLkgxaE-QqvmJVpLOkj8ZgN_si7dR0mr2uSFSlErHHpjSYXdOE4k10-Q5Ls6FkU3n8SZGAcgOeUlARErBwTzkEZxBR3S_6RWyLvy3qiQ_48XQqQNA535Fz0hyc8u3zRS7vgksRHSRBe_eEUKuUFOxNlT_nr2Ag=w457-h674-no)

Title: Re: Quad 303 restoration
Post by: Family_Dog on January 25, 2019, 06:33:26 AM
You forgot to add "Quality rebuild by mygoggie in South Africa" under the "Made in Huntington England etc" tab  ;)


-F_D
Title: Re: Quad 303 restoration
Post by: mygoggie on January 25, 2019, 08:01:50 AM
I was thinking of adding a small plaque somewhere stating something similar.
Title: Quad 303 restoration - Restoration plaque
Post by: mygoggie on January 25, 2019, 12:40:20 PM
An old style little plaque that will bolt onto the transformer. I kept the style 1960's and will punch the date in on the white rectangular space.

I think it will look good and not intrude.

(https://lh3.googleusercontent.com/NE0blpXV1pSF3UYT_dT-6wwSR-ddQlpu6xYb6OXtDijJC-AtOEKNe0byuG0ZaYnZxPIMKJUm5dyrzG6-Wd1_3G0vHw59O9Cs9gAxPhm29tcmnl368yvYUu0ffK3RHnC1Mz4qbAJ16XGGvNyt8AqzFAX3sbQkjJ9T8jJtdce9TZRrSbK_jEQ6Ljpg1AwQidj5WcWqNxfJYu2EaBVk0Z5K_5_xNf4ZdLkolsRI2vnAwk4jGrIMacSq4a1JpmV24CsxzLF9yauEMt1mJ2b4tPlU9g9khGj417pWxOHtfbfHq0OwJ-2MDLXs496CzO90_f4MCXGFKlhjb6mqykpm6cEZG-1LHPuohKW8FLdJIpFhqqSpKl1FH6PMq303eq_J3lUPm4GDOjsZVzBEhLhRto2agGieWFj2t9HX7eAIRIuKPd_KQeLhUgz0WQavX5sSm364gP5j5I25sBKnJPWOUxxOVI3lontSwmV4ZujP9N7QG5KqdHQz_q0T75kC8CKX577-jVqupaxddyErjGV-gqf1dAsP_azHUVSJWN3RqGgra_qqmr1h0sBTZUZlkj8OJWHrsjtpXk3_6FtdAsDYy_xX3sD8sYSfkzepTfmcBbewaNHcfNLDTfL90aNGa4pIuUaz0EMj7gEpuwhEqdmiF2FuYBddF7f96KU7Pne8V6UXRnbhCvAwKKkGb5i4emx0OQghU2rly6gT9T7Suq3gfQ=w473-h70-no)
Title: Re: Quad 303 restoration
Post by: Family_Dog on January 25, 2019, 03:19:16 PM
Looks good, so I can send all my outstanding projects for rebuilds to you now?   :angel:


-F_D
Title: Re: Quad 303 restoration
Post by: mygoggie on January 25, 2019, 03:30:29 PM
Looks good, so I can send all my outstanding projects for rebuilds to you now?   :angel:


-F_D

I had the energy to scratch in the garage (look around) and the garden today (watering) and it is actually shocking to see how everything is exactly as the day I fell ill. Midway between fixing the Pajero, installing a new PV system and a new water purification system ... so let me finish those then we can talk.
Title: Re: Quad 303 restoration
Post by: mygoggie on January 26, 2019, 03:48:53 PM
Today was plastic cleaning day. All the old plastic bits and bobs from the face plate needed cleaning and rejuvenation.

I mixed my usual cleaning mix of methylated spirits, ammonia, dish washing liquid and water and chucked all the plastic parts in the solution.

(https://i.postimg.cc/m2vvk5tk/IMG-20190126-130006.jpg)


I left these for an hour and then rinsed it, and scrubbed it with a new mixture of dishing washing liquid and water using an old toothbrush. All nice and clean and drying on a towel. No, I won't say where I got the towel ... if you follow mrpete222 on YouTube! you will know.

(https://i.postimg.cc/yNB2X3hz/IMG-20190126-132841.jpg)


Some compressed air and all the holes were nice and dry as well.

To get some shine back into the old plastic, I mixed some glycerin, pharmaceutical liquid paraffin (yes the stuff you had to drink as a child) and ammonia (acting as the oxidant). Into this mix the plastic parts went and after two hours of soaking, I removed them and gave them a good rub down.

Looking brand spanking new. I just need to think about getting the white lettering done on the voltage selector. I do not know if it is possible.

(https://i.postimg.cc/8zLq6m6H/IMG-20190126-152944.jpg)

Title: Quad 303 restoration - Plastic bits on front plate
Post by: mygoggie on January 26, 2019, 06:19:37 PM
The voltage selector face kept bugging me. I simply had to get the text readable again ....  :roll:

So I decided to see what I can do about it. I took some surgical spirits and cleaned the face of the selector to remove any oils that I have covered it with.

I then took some of the Boss's white art acrylic (yes, she paints permanently) and see how I could rub it in. I first tried a rag, and then a hard tissue based wipe. This did not work as it kept wiping the paint out of the indention of each imprint.

I then thought about wine corks. They are absorbent and offer a very flat surface. I tried rubbing the paint into the indentions and it worked!

I left the paint for a while to dry to a stage where it will stick but still can be rubbed off. I then took another cork, dabbed the end in soapy water and wiped the end dry. I then rubbed the cork over the painted area and the letters came to life.

The end of the 120 and 220 are so shallow that I tried three times to get more paint to stick in there, but alas, it simply rubs out. So I decided in the 1960's they used hand methods and would not have been able to get it better than I did. So I am leaving it as it is now. Tomorrow I will polish the last remains off the face of the selector.

(https://i.postimg.cc/rFR68ky7/IMG-20190126-175138.jpg)
Title: Re: Quad 303 restoration
Post by: Family_Dog on January 26, 2019, 06:39:58 PM
Your cleaning methods work well, the parts are as good as new!


-F_D
Title: Quad 303 restoration - Faceplate
Post by: mygoggie on February 09, 2019, 09:32:33 AM
I sent a thank you email to the designer of the Motor Oil 1937 M54 font that I used to create the faceplate template. He was kind enough to reply as follows:

"Hi Herman,

Thanks for getting in touch and sharing your experiences of the font. I'm glad you found it useful :)

Best,
Mosh"


Always good to get feedback from people that makes my life a lot easier!
Title: Quad 303 restoration - Metal parts
Post by: mygoggie on February 11, 2019, 09:24:51 PM
My friend came this evening to fetch the Quad 33 and 303 metal parts to be cleaned and bright zinc plated.

I trust this was the last time I see them in this bad state!

(https://i.postimg.cc/sXj237r5/Quad-33-and-303-metal-parts.jpg)
Title: Re: Quad 303 restoration
Post by: Family_Dog on February 12, 2019, 06:48:33 AM
Looking at the above, I doubt whether I would have even bothered with a restoration! You're doing good work there, saving this poor old piece of audio gear, Peter Walker would be turning in his grave had he seen it :)

Can't wait to see the final result.


-F_D
Title: Re: Quad 303 restoration
Post by: mygoggie on February 12, 2019, 07:48:05 AM
Looking at the above, I doubt whether I would have even bothered with a restoration! You're doing good work there, saving this poor old piece of audio gear, Peter Walker would be turning in his grave had he seen it :)

That is why I said in the very first post: "Maybe I am crazy, but I think I will give the restoration a go."

Thanks @Family_Dog for the kind words. I am learning a lot and this project actually was the main thing that kept me sane through my illness.
Title: Quad 303 restoration - Paint
Post by: mygoggie on February 12, 2019, 07:49:20 AM
Today it is off to the automotive paint shop to have the paint mixed. I will report back on what I managed to achieve.
Title: Re: Quad 303 restoration
Post by: El Sid on February 12, 2019, 09:24:37 AM
Herman your attention to detail is astonishing - I have to admit that I wouldn't have gone as far as you! Electronics yes, but chassis/cosmetics no. You put most of us "restorers" to shame.

This is "concourse" standard!
Title: Re: Quad 303 restoration
Post by: HB on February 12, 2019, 10:42:29 AM
^^ +1 a huge amount of effort and dare I say it....love. I am somewhat OCD but must concede. Herman this is impressive!
Title: Re: Quad 303 restoration
Post by: mygoggie on February 12, 2019, 12:43:32 PM
Thanks guys. Coming from you this means a lot!
Title: Re: Quad 303 restoration
Post by: mygoggie on February 12, 2019, 12:46:38 PM
Back from the automotive paint shop. Paint ordered. I had to laugh as my friend there said they have this new colour sensing paint matching machine that you scan the surface and it gives you the mix. It cost a few bags of gold, but the old guy that has been matching and mixing paint for the last 45 years still gets a better match by simply eyeballing it.
Title: Quad 303 restoration - Transformer
Post by: mygoggie on February 12, 2019, 03:37:33 PM
As per this thread (https://www.avforums.co.za/index.php/topic,77651.msg908008.html#msg908008) I am looking for 2BA machine screws for the transformer and 4BA screws for the rest of the assembly. If you have four of the 2BA and quite a few of the 4BA screws lying around doing nothing, I can put them to good use!

Here is an image of the 2BA screw.

(https://i.postimg.cc/KcwLSvWY/Quad-303-Transformer-machine-screw.jpg)
Title: Re: Quad 303 restoration
Post by: bushtech37 on February 12, 2019, 03:49:14 PM
if you're in Jhb try JKN in Randburg
Title: Quad 303 restoration - Transformer
Post by: mygoggie on February 12, 2019, 03:54:26 PM
I have contacted them, thanks.

I am in Port Elizabeth and normally if you cannot find a fastener here you will not find it in SA. One thing about the motor manufacturing industry that many of the tooling is imperial with all weird types of fasteners.
Title: Re: Quad 303 restoration
Post by: mygoggie on February 13, 2019, 12:17:26 PM
if you're in Jhb try JKN in Randburg

What a useless bunch. Had no idea what I am talking about and the proceeded to quote me on metric.  :facepalm:
Title: Re: Quad 303 restoration
Post by: mygoggie on February 13, 2019, 07:28:25 PM
Based on the questions I have received when I asked for a SA based supplier of BA machine screws, I sat down and compiled a detailed description list of all the fasteners I could find on the Quad 303. I might have missed something and if so please let me know so that I can update it.

The PDF version can be downloaded from here (https://www.dropbox.com/s/7opwkr3m0lo3pe8/Quad%20303%20-%20Fasteners.png?dl=0).

(https://i.postimg.cc/2yrNB1Fr/Quad-303-Fasteners.png)

Title: Re: Quad 303 restoration
Post by: mygoggie on February 15, 2019, 07:30:10 PM
I got the paint back from the paint shop. I think I must not say too much and rather let the photos speak for themselves ....

I have told them the paint is going back and must be fixed. Why is there always enough time to do something right the second time?

(https://i.postimg.cc/PxRgHwjq/IMG-20190215-192135.jpg)

(https://i.postimg.cc/Th8BLvhM/IMG-20190215-192207.jpg)

(https://i.postimg.cc/gkZWYNrb/IMG-20190215-192218.jpg)
Title: Re: Quad 303 restoration
Post by: mygoggie on February 15, 2019, 07:49:29 PM
I have found 90% of the machine screws and nuts in the UK. Just the long 2BA's that I will have to have made up or weld the heads up and machine them down and reslot each.

Anyone traveling from the UK to SA in the near future and willing to bring the two very tiny packages over the oceans for me?
Title: Re: Quad 303 restoration
Post by: mygoggie on February 17, 2019, 08:32:35 AM
Yesterday I took the painted Quad 303 and Quad 33 panels with the newly mixed paint samples to a friend of mine that restores high value cars.

I got a long lecture that there is absolutely no glitter (metallic bits) in the paint and that the paint used on the Quads were the same 1K single stage acrylic paint and process used on the old Rover and Jaguar cars. Secondly that the Quad parts were obviously not sprayed but dipped. Always good to speak to someone that really knows his stuff.

After a few rounds of discussions he kindly offered to take the panels to a friend of his at a German paint manufacturing company and have the correct equivalent mixed.

Let's see what comes back.
Title: Re: Quad 303 restoration
Post by: mygoggie on February 17, 2019, 09:12:27 AM
Two interesting titbits I found on the www regarding painting a Quad.

The original paint was made by Trimit.

A good close match for the case is Humbrol Olive Drab No.155 matt paint.
Title: Re: Quad 303 restoration
Post by: HB on February 17, 2019, 09:13:14 AM





"the Quads were the same 1K single stage acrylic paint and process used on the old Rover and Jaguar cars. Secondly that the Quad parts were obviously not sprayed but dipped."


Very interesting. Makes sense considering the era in which these were made.
Title: Re: Quad 303 restoration
Post by: Skylark on February 17, 2019, 01:44:57 PM
By 1K I'm assuming that means Duco, which is in many respects useless as a paint as its as durable as cheese. I'd get the colour matched in 2k and have them finished in 2K, the end result is going to look the same but be infinitely more durable.
Title: Re: Quad 303 restoration
Post by: mygoggie on February 17, 2019, 01:55:29 PM
By 1K I'm assuming that means Duco, which is in many respects useless as a paint as its as durable as cheese. I'd get the colour matched in 2k and have them finished in 2K, the end result is going to look the same but be infinitely more durable.

That is what I asked and they could not do it in 2K. Not possible in 2K said my friend as well who knows.

As far as I understand him, 1K is a paint that does not require a catalyst or hardener. It can be any enamel, acrylic, lacquer, latex based paint. In this case it was an acrylic with some kind of metallic underlying coat.

Let's see what my friend comes up with.
Title: Re: Quad 303 restoration
Post by: Skylark on February 18, 2019, 03:19:57 PM
That is what I asked and they could not do it in 2K. Not possible in 2K said my friend as well who knows.

As far as I understand him, 1K is a paint that does not require a catalyst or hardener. It can be any enamel, acrylic, lacquer, latex based paint. In this case it was an acrylic with some kind of metallic underlying coat.

Let's see what my friend comes up with.
Why ever not, unless the 2k would react with the underlying surface(metal) which I highly doubt?
Title: Re: Quad 303 restoration
Post by: mygoggie on February 18, 2019, 03:33:22 PM
Why ever not, unless the 2k would react with the underlying surface(metal) which I highly doubt?

I really have no idea. I am not at all knowledgeable on auto spraying. My friend really is. All I know is the specialist paint shop could not get the colour shifting (as the light changes direction) right in 2K. They actually gave up. I will ask my good friend when he reports back with hopefully the correct paint.
Title: Re: Quad 303 restoration
Post by: mygoggie on February 19, 2019, 12:56:23 PM
I went this morning to the pensioner's gathering of the Port Elizabeth Model Locomotive Society (https://www.facebook.com/PEMLS1/) with my four transformer machine screws. No, problem they said, they will clean the heads and thread of the four screws for me. Amazing!
Title: Re: Quad 303 restoration
Post by: DC on February 19, 2019, 02:12:41 PM
Wow, you really are restoring the Quads with a meticulousness that is inspiring.  :dop:
Title: Quad 303 restoration - Machine screws
Post by: mygoggie on February 20, 2019, 01:43:11 PM
I received a missed phone call yesterday which I returned this morning. The 4 off 2BA transformer screws are ready for collection. Wow service!

The brass 4BA screws I found in Cape Town and the rest I ordered in the UK.

Now to hunt down the 1/8" tube rivets ...
Title: Re: Quad 303 restoration
Post by: Qualityten on February 20, 2019, 08:51:35 PM
Great to hear of help from those retired model locomotive builders in PE.  People with real engineering skills from building cars and locomotives in Uitenhage and PE.
Title: Re: Quad 303 restoration
Post by: mygoggie on February 20, 2019, 09:06:56 PM
Great to hear of help from those retired model locomotive builders in PE.  People with real engineering skills from building cars and locomotives in Uitenhage and PE.

So true and sadly not recognized any more .. :vsad:
Title: Re: Quad 303 restoration
Post by: mygoggie on February 21, 2019, 04:09:53 PM
I think I got myself a new mentor ...

Was at the model steam engine builder's home workshop to collect the cleaned transformer 2BA machine screws. Was fun to see a real artisan at work and making all his own tools!

Here he showed me a jig I must make to make my own tube rivets. And I promised myself no more new projects!

(https://i.postimg.cc/7LKQnRVd/IMG-20190221-103517.jpg)



The cleaned machine screws. Just need to get four fibre washers. I should have some somewhere from the old PC building days.

Edit: I now noticed he even straightened the one bent screw.

(https://i.postimg.cc/rmzZn9Zm/IMG-20190221-155808.jpg)
Title: Re: Quad 303 restoration
Post by: mygoggie on February 28, 2019, 10:30:36 PM
I have been silent for the last few days as I have to catch up on 2 months of work.

Things are a bit slow on the 303 as I have had a hiccup with the recoating of the metal parts. Hopefully it can be resolved in the next week.

 :help: Still trying to find someone that can make me the three PCBs and not try and rip my arm and my leg off my body. If you can advise me, I will appreciate it dearly!

Paint is still not sorted out as well. Will have to remind a friend of two again I guess ...
Title: Re: Quad 303 restoration
Post by: mygoggie on March 15, 2019, 01:12:08 PM
I finally managed to get my metal parts from my friend and handed these in yesterday at the plating company. I received them back this morning and what a difference!

All the bits and bobs of this Quad 303 and the Quad 33 (https://www.avforums.co.za/index.php/topic,76696.0.html) below. Compare this to the original condition.

Before:

(https://i.postimg.cc/sXj237r5/Quad-33-and-303-metal-parts.jpg)



After:

(https://i.postimg.cc/t4x8v6qM/IMG-20190315-113956.jpg)


The chassis waiting for me to start assembling!

(https://i.postimg.cc/DZBN4d68/IMG-20190315-114049.jpg)

Title: Re: Quad 303 restoration
Post by: HB on March 15, 2019, 01:34:37 PM
 :rubhands:
Title: Quad 303 restoration - Transformer assembly
Post by: mygoggie on March 16, 2019, 11:43:08 AM
Between load shedding and my other work I did a test fit of the transformer onto the chassis. I had to remove quite a lot of varnish from the holes, hence the mess on the black felt cloth.

Looking good, so onto cutting new fibre washers and then dunking the whole assembly in varnish.

(https://i.postimg.cc/h4wXsTZm/IMG-20190315-174511.jpg)
Title: Quad 303 restoration - Transformer assembly
Post by: mygoggie on March 16, 2019, 09:27:00 PM
To start off with the fibre washer making, I first did a CAD drawing of the template for the washers. The idea was to have some form of guideline to use to punch the holes with.

Here is the template drawing below and you can also download the PDF files of this from here (https://www.dropbox.com/s/u1ztkomwb1wlqfq/Quad%20303%20-%20transformer%20fibre%20washer%20template.pdf?dl=0).

(https://i.postimg.cc/rw8M23xX/Quad-303-transformer-fibre-washer-template.png)



First step was to stick the template to the 1960 type gasket sheeting.

(https://i.postimg.cc/5tXcxVtG/IMG-20190316-200200.jpg)



The tools to use was a standard hole punch pair of pliers and a tabular punch as shown below.

(https://i.postimg.cc/x8SByNPD/IMG-20190316-200216.jpg)


I did not know if I should start with the larger diameter punch or the smaller center holes first. I made a random decision and punched the center holes first.

(https://i.postimg.cc/3J1zmR4V/IMG-20190316-200645.jpg)


The plan did not work that good as I could not align the tubular punch 100% as it was a 10mm one and the lines on the template was at 9,7 mm. I ended up having to do an extra two washers starting out with punching the larger diameter circle first and then carefully aligning the hole punch pliers to get the inside hole as good as possible.

All good and here are the four washers ready for installation.

(https://i.postimg.cc/K8qSSzmB/IMG-20190316-202137.jpg)


The transformer fully assembled with all the cleaned and restored parts. Onto dunking it in the varnish!

(https://i.postimg.cc/PxDBwQYQ/IMG-20190316-204444.jpg)



It too some practicing to get the transformer to fit through the can's opening and then to turn it to stand on the legs. I ended up screwing two of the nuts onto the end of one of the bolts, locking the nuts and gripping these with a pair of pliers and turn the transformer horisontally. Man, it is heavy ...

First dunking done and a wet transformer drip drying till tomorrow.

(https://i.postimg.cc/pLd4ZHKT/IMG-20190316-205534.jpg)


PS. For those of you that are a bit pedantic, I did align the one machine screw head after taking the photo.
Title: Quad 303 restoration - Transformer assembly
Post by: mygoggie on March 17, 2019, 08:05:06 AM
This morning it was time for another bath. I left the transformer in the varnish for a while to let all the air pockets escape and the voids fill with varnish.

In the background the varnish I am using.

The bottom of the transformer is touching the wooden plank as the legs are just that "much" too short, so the little plank (in the foreground) and its hiding mate gets stuck below the machine screw nuts to lift the transformer a bit once most of the wet dripping has stopped.

I like what I see ...

(https://i.postimg.cc/T3yYR9xY/IMG-20190317-075555.jpg)
Title: Re: Quad 303 restoration
Post by: HB on March 17, 2019, 08:10:42 AM
I like what you see too.
Title: Quad 303 restoration - Transformer assembly
Post by: mygoggie on March 17, 2019, 05:57:45 PM
I grabbed a few minutes to bolt the transformer onto the chassis.

There she is in place and waiting for her fellow components.

(https://i.postimg.cc/Gm4q1rPN/IMG-20190317-163548.jpg)



Just to highlight the difference a quick before and after. Looking a whee tad better I would say.

Before:

(https://i.postimg.cc/SNNgDcnm/IMG-20181228-144212.jpg)



After:

(https://i.postimg.cc/ncR05MmB/IMG-20190317-174253.jpg)
Title: Re: Quad 303 restoration
Post by: Jaws on March 17, 2019, 06:26:43 PM
Amazing attention to detail. Well done

Sent from my Redmi 4X using Tapatalk

Title: Quad 303 restoration - Machine screws
Post by: mygoggie on March 25, 2019, 01:02:44 PM
The machine screws arrived today after being cleaned and zinc plated.

(https://i.postimg.cc/ZY1w71j8/IMG-20190325-122952.jpg)
Title: Re: Quad 303 restoration
Post by: DACMan1 on March 25, 2019, 01:14:31 PM
Great job so far. There is something very pleasing about these threads( ;) ) of yours.
Might I suggest experimenting with woodoc 20 instead of 10. Just thin it down with turps until you get the same viscosity as you had with woodoc 10 - this way you would be left with a lot more solids than woodoc 10.
Title: Re: Quad 303 restoration
Post by: mygoggie on March 25, 2019, 02:14:33 PM
Thanks @DACMan1 for the compliment. Graciously accepted!

I had to fit the capacitor holders just to see how the machine screws will work. The screws did not fit ... It took me a bit of time to figure out I used the longer screws of the transistors. Ai ai  :facepalm: Will teach me to put the screws into the correct pill holder!

Removing all the screws and using the new ones, it looks like we are on the right track. The threads do not lock and runs smoothly till the screw tighten up against the head.

I guess now I can focus on buying the parts and getting the PCBs made. It is starting to look like I will have to do this myself as nobody wants my business when it comes to the PCBs. Anyone here that has done this before and can give some "Not to Do" hints?

The chassis with the cap holders fitted. Pleasing to my eyes!

(https://i.postimg.cc/kGC8b3xC/IMG-20190325-140149.jpg)
Title: Re: Quad 303 restoration
Post by: mygoggie on March 25, 2019, 02:42:10 PM
Might I suggest experimenting with woodoc 20 instead of 10. Just thin it down with turps until you get the same viscosity as you had with woodoc 10 - this way you would be left with a lot more solids than woodoc 10.

I hear you on this, but as I said in a few posts back Woodoc 10 is what I had and I was too sick to buy anything else. In my opinion the current new four coats is ample enough in terms of thickness and protection. Next time I will try Woodoc 20.
Title: Re: Quad 303 restoration
Post by: mygoggie on April 18, 2019, 10:25:31 PM
Just a C&P from the Quad 33 thread to keep you updated.

I have been rather busy at work and fixing the Pajero while waiting for the paint to be found and mixed. Today I received a WhatsApp stating that the paint is mixed and ready for collection.

Let's hold thumbs that this time it will be the correct type and colour!

The new feet from UK via Germany via a friend is now close to me. Will fetch it this weekend.

The brass machine screws were also delivered via a friend from Cape Town. Will only get that next week ...

Will hopefully post some pictures in the next few days!
Title: Quad 303 restoration - Paint
Post by: mygoggie on April 28, 2019, 06:45:10 PM
I made work this week to find out what happened to the paint I had mixed.

When I got to the place where the paint should be, only one colour was mixed. That was only the start of what is now a situation I do not know how to resolve.

I gave my friend the Quad FM3 as a reference to have the paint mixed. This unit was in an excellent and original condition. Not anymore ...

They used the cover to dab the samples of the new paint on and then wiped it clean with thinners ....

What used to be a Quad in original mint condition is now a repaint job. And this supposed to be the paint supplier  :nutter: :ticked: :ticked: :ticked:

(https://i.postimg.cc/pXWL0FZ5/IMG-20190428-161704.jpg)

(https://i.postimg.cc/R0HS3QMy/IMG-20190428-161645.jpg)
Title: Re: Quad 303 restoration
Post by: marantz123 on April 28, 2019, 10:18:19 PM
They could have tested on another piece of metal or a piece of paper and compared it to the original. Besides this, theres digital colour matching these days that takes some of the guess work out of this, why are these guys messing up! The other thing is that the paint on that cover looked fine, they couldve tested on the inside of the cover. The other option would have been to make a colour photocopy of the lid and let them use that for sample matching...if the copy colour was accurate. Sorry to see this but theres challenges and risks in almost any cosmetic repair or restoration.
Title: Re: Quad 303 restoration
Post by: Family_Dog on April 29, 2019, 06:52:34 AM
I'm actually speechless! As Marantz states, there are certainly ways to match the sample other than destroying it.  Perhaps try another panel beater?

-F_D
Title: Re: Quad 303 restoration
Post by: mygoggie on April 29, 2019, 08:07:33 AM
It is not a panel beater @Family_Dog. It is a major international automotive paint supplier ...

The issue with the Quad paint is that the moment the digital paint scanner scans it, it sees about 20 different colours with the 20 different cameras. Still no reason to test the hand mixed colour on a perfect piece of equipment that was never to be restored.

I am beyond speechless. And both projects (33 and 303) again is standing still as I cannot proceed without painting the cases and panels.
Title: Re: Quad 303 restoration
Post by: Family_Dog on April 29, 2019, 08:15:50 AM
You might still get better results from a panel beater, one who works 'Analog' style and matches by eye ;)


-F_D
Title: Re: Quad 303 restoration
Post by: mygoggie on April 29, 2019, 08:28:07 AM
You might still get better results from a panel beater, one who works 'Analog' style and matches by eye ;)


-F_D

The issue is that they all have the paint mixed by the suppliers. None over here mix themselves. I tried that route.
Title: Re: Quad 303 restoration
Post by: Family_Dog on April 29, 2019, 10:26:00 AM
I guess my PB is old-fashioned then - last I bought paint he mixed it himself with one of those fancy machines.


-F_D
Title: Re: Quad 303 restoration
Post by: marantz123 on April 29, 2019, 03:45:45 PM
So...going forward with this lid....it looks like the original paint itself is not damaged, and the thinners has hopefully just smeared the wet tested paint on the surface ( the thinners accelerated drying of what was left of the test paint, hence the remaining residue that didnt clean off) and now a residue exists? A suitable polish may remove it, or a gentle wipe with some isopropyl alcohol. The original paint should be pretty hard and well set after all these years and thick enough to survive some cleaning.

A thought on testing what would work...take some other old painted metal, and put some paint on it, then clean it off with thinners and let it dry. On another section, do the same but clean it off with isopropyl. Observe residue. ( I suggested testing iso here just to see how it performs, being waterbased thus giving more time for cleaning off anything, resulting in no/minimal residue) Prepare a few test areas like this and try cleaning off any residue with different substances( polish, an oil rub, isopropyl, vinegar, soap/water etc.)  in each example. Something will remove that residue. Im really guessing that a gentle rub / scrub with a soft old toothbrush using some light oil will remove it...but test first elsewhere as explained...and start with the gentler options like soap/water before anything harder. Good luck, and we all learn as we go. You may need to wax that lid as the cleaning you do now will strip any protective layer formed over the years and may look a bit dulled otherwise.

On a thankful note, you can be glad that they didnt try too hard to undo what they did as they could have made this alot worse.
Title: Re: Quad 303 restoration
Post by: mygoggie on April 29, 2019, 04:20:32 PM
So...going forward with this lid....it looks like the original paint itself is not damaged, and the thinners has hopefully just smeared the wet tested paint on the surface ( the thinners accelerated drying of what was left of the test paint, hence the remaining residue that didnt clean off) and now a residue exists? A suitable polish may remove it, or a gentle wipe with some isopropyl alcohol. The original paint should be pretty hard and well set after all these years and thick enough to survive some cleaning.

A thought on testing what would work...take some other old painted metal, and put some paint on it, then clean it off with thinners and let it dry. On another section, do the same but clean it off with isopropyl. Observe residue. ( I suggested testing iso here just to see how it performs, being waterbased thus giving more time for cleaning off anything, resulting in no/minimal residue) Prepare a few test areas like this and try cleaning off any residue with different substances( polish, an oil rub, isopropyl, vinegar, soap/water etc.)  in each example. Something will remove that residue. Im really guessing that a gentle rub / scrub with a soft old toothbrush using some light oil will remove it...but test first elsewhere as explained...and start with the gentler options like soap/water before anything harder. Good luck, and we all learn as we go. You may need to wax that lid as the cleaning you do now will strip any protective layer formed over the years and may look a bit dulled otherwise.

On a thankful note, you can be glad that they didnt try too hard to undo what they did as they could have made this alot worse.

Good advice! Will follow it and see what I can achieve.
Title: Re: Quad 303 restoration
Post by: mygoggie on May 04, 2019, 06:47:21 PM
A quick update, been a hectic few last days between work and working on the Pajero. Why is nobody willing to sell you parts in this country (tried the agents four times now to give me a quotation) and a guy in Thailand replies the same day with a detailed breakdown of original part costs couriered to my home?

No, I have not had the time to try and clean the FM3 cover. Will try my hand at this tomorrow.

I have finished the Quad 33 and 303 component lists on Mouser. Need to double check it next week and then order.
Title: Re: Quad 303 restoration
Post by: mygoggie on May 04, 2019, 11:00:18 PM
So, I made some time tonight to try and see if I can save the FM3 cover. The marks were dissolved paint and not simply dirty marks. I managed to polish out most of the marks, but there are three areas where the paint layer has been thinned and the edges of these are clearly visible at an angle. The worst is the spot where the top coat was completely removed to the base coat.

(https://i.postimg.cc/VvBr8ZGy/IMG-20190504-224812.jpg)

So ... either I leave it as is or I respray it. Whichever way, the unit is not original anymore. So maybe I must do a "QUALITY REBUILD BY MYGOGGIE (https://www.avforums.co.za/index.php/topic,76695.msg904085.html#msg904085)" on this one to save some value.

Anyway, still waiting for an apology and the silence is not golden this time round.
Title: Re: Quad 303 restoration
Post by: Trompie67 on May 05, 2019, 12:45:16 AM
Some spare time on the interwebs this evening/morning brought many references to the following for the cases:

Humbrol model paints.

Colour: Olive Drab No.155 matt

Dealers can be found here: http://www.redipak.co.za/
Title: Re: Quad 303 restoration
Post by: mygoggie on May 05, 2019, 09:09:04 AM
Some spare time on the interwebs this evening/morning brought many references to the following for the cases:

Humbrol model paints.

Colour: Olive Drab No.155 matt

Dealers can be found here: http://www.redipak.co.za/

Thanks for the info. I did look into that right at the start of the exercise, but the paint used by Quad is a very difficult to match metallic paint that has an almost pearl type behavior under light. The Humbrol paint is a close match in colour, but is a flat paint so alas it is not a good match in terms of final finish.
Title: Re: Quad 303 restoration
Post by: mygoggie on May 10, 2019, 06:45:09 PM
The last two days I made some effort to get the PCBs sorted out and find a company that will make the two boards. After reading an old thread here on AVF, I contacted Bosco and they were really very helpful.

So all the paperwork is sorted out and the drill maps made and sent through.

Now to make a donation to them for their kind service and machine time and hopefully I will have the boards sometime next week.

Here are the drill maps for the two PCBs to be used for future reference.

The regulator board

(https://i.postimg.cc/3xh7J2KF/Quad-303-Regulator-board-mygoggie-2019-rel1-0c-Drill-map.jpg)



The output board

(https://i.postimg.cc/jdPtbMrj/Quad-303-Output-board-V9-mygoggie-2019-rel-1-0a-Drill-ma.jpg)
Title: Re: Quad 303 restoration
Post by: Skylark on May 12, 2019, 10:46:33 PM
Wiping the paint directly onto the supplied sample is very poor form, especially when it's obvious it's not an automotive part and hence they cannot assume the paint is 2k and tough as nails. They have special test cards for spraying the mixed colour onto, that's just laziness or ineptitude.

Some of the bigger/higher end panel beaters still do in house colour matching.

Phone Basf/Glasurit/PPG and ask them which is the closest panelbeater to you that has a mixing setup. They will know because they are the biggest suppliers and also monitor the entire panelbeating market trying to poach new paint customers.
Title: Re: Quad 303 restoration
Post by: mygoggie on May 13, 2019, 08:01:52 AM
Wiping the paint directly onto the supplied sample is very poor form, especially when it's obvious it's not an automotive part and hence they cannot assume the paint is 2k and tough as nails. They have special test cards for spraying the mixed colour onto, that's just laziness or ineptitude.

Some of the bigger/higher end panel beaters still do in house colour matching.

Phone Basf/Glasurit/PPG and ask them which is the closest panelbeater to you that has a mixing setup. They will know because they are the biggest suppliers and also monitor the entire panelbeating market trying to poach new paint customers.

Thanks for the info. Will do, but most certainly not the first name you mentioned.
Title: Re: Quad 303 restoration
Post by: Skylark on May 13, 2019, 11:31:44 AM
Thanks for the info. Will do, but most certainly not the first name you mentioned.
Why not Basf?
I think they own Glasurit and a few other auto paint companies and you can try Azko-Noble, they do a few automotive paint lines.
Title: Re: Quad 303 restoration
Post by: mygoggie on May 13, 2019, 11:56:01 AM
Why not Basf?
I think they own Glasurit and a few other auto paint companies and you can try Azko-Noble, they do a few automotive paint lines.

Make your own deduction ... something to do with this thread.
Title: Re: Quad 303 restoration
Post by: Skylark on May 13, 2019, 07:36:45 PM
Make your own deduction ... something to do with this thread.
I must have missed it, what did they do?
Title: Re: Quad 303 restoration
Post by: mygoggie on May 13, 2019, 07:42:21 PM
I must have missed it, what did they do?

Used the FM3 body as a testing bed for the paint mix ....
Title: Re: Quad 303 restoration
Post by: Skylark on May 14, 2019, 11:15:18 PM
Used the FM3 body as a testing bed for the paint mix ....
That's the paint mixing shops fault/poor show not BASF or whatever supplier they use, unless you went direct to BASF themselves to get the paint matched?
Title: Re: Quad 303 restoration
Post by: mygoggie on May 15, 2019, 08:22:19 AM
That's the paint mixing shops fault/poor show not BASF or whatever supplier they use, unless you went direct to BASF themselves to get the paint matched?

Directly at the offices of the company lastly mentioned.
Title: Quad 303 restoration - Machine screws
Post by: mygoggie on July 08, 2019, 08:41:48 PM
I am back from my trip to the EU so the project can get going again!

I brought back all the machine screws and nuts I would need for the Quad 303 and 33 projects. A whopping 8.80 later, these were sent to an address in Germany where I collected the parcel.

Thanks Mike Searle of Margnor (Fasteners) Ltd in the UK for your exemplary service!

(https://i.postimg.cc/RCyvhSfX/Quad-33-and-303-screws.jpg)


(https://i.postimg.cc/VvxwVg13/Quad-33-and-303-nuts-and-washers.jpg)
Title: Quad 303 restoration - Regulator and output board PCB
Post by: mygoggie on July 08, 2019, 09:06:54 PM
I received the PCBs as made by Bosco today.

I must be honest, I had high expectations and when I opened the parcel, my hope evaporated. I could not believe what I saw.

The first thing I noticed was that the output PCB was cut to the wrong size. I simply could not believe it ....  :OMG:

On closer inspection I saw that the boards were redesigned using some PCB layout package and in the process, the dimensions of the circuit layout was changed, one hole was omitted and the font of the wording changed.

I also noticed that some black paint/varnish was sprayed on and with it numerous dust particles. This was sprayed over the lettering and the logo.

I simply cannot believe that a company can produce such work. This after the exact high resolution images with scales, dimensions and drill hole layout was sent and accepted by them.

Some mistakes found.

(https://i.postimg.cc/SsQcn70F/PCB-boards-made-incorrectly-with-comments.jpg)



I have emailed them and their comment simply was that they will refund me. I mean where is the honour in business these days? Simply taking the easy way out is not on in my books. If you made a balls up, face the music and fix it.

I am really really disappointed and honestly lost for words.

Title: Re: Quad 303 restoration
Post by: Family_Dog on July 09, 2019, 07:21:24 AM
That's a bunner, Herman.

Why don't you contact one of the Company's listed in the EBG, you would certainly get better results.

https://www.ebg.co.za/products.aspx?GSACC=55


-F_D
Title: Re: Quad 303 restoration
Post by: mygoggie on July 09, 2019, 08:28:56 AM
Thanks Eric, I will try there and ignore the name Bosco in that list.
Title: Re: Quad 303 restoration
Post by: pwatts on July 09, 2019, 08:50:56 AM
Go to China. I use Seeed for my cheap boards, never disappointed. Most local pcb houses either is a front to China anyway, or operate a hybrid model where they do some stuff in-house and the rest in China. TraX in CT is good but very expensive.

Sent from my BLA-L09 using Tapatalk

Title: Re: Quad 303 restoration
Post by: mygoggie on July 09, 2019, 09:05:09 AM
Go to China. I use Seeed for my cheap boards, never disappointed. Most local pcb houses either is a front to China anyway, or operate a hybrid model where they do some stuff in-house and the rest in China. TraX in CT is good but very expensive.

Sent from my BLA-L09 using Tapatalk

Thanks @pwatts that is maybe why I am so disappointed. My last batch of PCBs I had made for an industrial project was done in China. It cost the same and was brilliant quality boards.

Question, how do you get the boards back to SA?
Title: Re: Quad 303 restoration
Post by: pwatts on July 09, 2019, 09:18:39 AM
Question, how do you get the boards back to SA?

In the past I used normal shipping but with SAPO being what it is I nowadays go for DHL. I usually lump a number of different projects together to distribute the cost, since for a single $10 order the shipping will easily outweigh it.
Title: Re: Quad 303 restoration
Post by: mygoggie on July 09, 2019, 09:24:36 AM
In the past I used normal shipping but with SAPO being what it is I nowadays go for DHL. I usually lump a number of different projects together to distribute the cost, since for a single $10 order the shipping will easily outweigh it.

Yep, that is the main reason why I went with the recommended manufacturer in SA. When are you doing a run again so that I can see if I can pool my few boards with yours?
Title: Re: Quad 303 restoration
Post by: Skylark on July 09, 2019, 10:03:57 PM
You could possibly use Aramex Global Shopper service seeing they are small and light weight, will probably cost R200-300 landed to ship them here.
Title: Re: Quad 303 restoration
Post by: mygoggie on July 10, 2019, 02:52:44 PM
So the friendly guys at EDA Technologies (https://www.edatech.co.za/) went out of their way to try and help me. It appears that everybody in the industry these days only use Gerber or such e-files to drive their PCB plotters. Thanks Rean for all your trouble!

So I will have to revert to the original method of doing the boards.

Is there anyone on this board that manages or has access to a silkscreen business that can burn a very fine mesh screen for me? I then can silkscreen the layout onto the PCB and take it from there.
Title: Re: Quad 303 restoration
Post by: marantz123 on July 10, 2019, 11:07:14 PM
So the friendly guys at EDA Technologies (https://www.edatech.co.za/) went out of their way to try and help me. It appears that everybody in the industry these days only use Gerber or such e-files to drive their PCB plotters. Thanks Rean for all your trouble!

So I will have to revert to the original method of doing the boards.

Is there anyone on this board that manages or has access to a silkscreen business that can burn a very fine mesh screen for me? I then can silkscreen the layout onto the PCB and take it from there.

Why not use the photo transfer film method ....its quick and gives good results. MicroRobotics ( no affiliation) keeps something like this.
Title: Re: Quad 303 restoration
Post by: gapco on July 11, 2019, 12:01:48 AM
Why not try these guys for a solution. They produce PCB's from PDF files. I have never used but have seen some of their work which was pretty good.

http://www.cboards.co.za/index.php

Regarding Bosco I have used them for many years and received good quality boards, I do supply them with Gerber files for the boards, so if ever there are problems it's as a result of my doing and not theirs.

Here is some of Bosco's work.

https://imgur.com/4reyNYf



Title: Re: Quad 303 restoration
Post by: mygoggie on July 11, 2019, 06:19:27 AM
Why not try these guys for a solution. They produce PCB's from PDF files. I have never used but have seen some of their work which was pretty good.

http://www.cboards.co.za/index.php

Thanks, will contact them.

Regarding Bosco I have used them for many years and received good quality boards, I do supply them with Gerber files for the boards, so if ever there are problems it's as a result of my doing and not theirs.

You know that is what ruined my day. They come highly recommended by everyone I spoke to (including you now). They confirmed that they can do the job without Gerber files and when this disaster happened, they simply shrugged their shoulders and did not even offer to fix the problem. Just said we will refund you and walked away. In my book, that is poor business strategy. Enough of this issue now ... let's walk on and find a solution.
Title: Re: Quad 303 restoration
Post by: mygoggie on July 11, 2019, 06:21:46 AM
Why not use the photo transfer film method ....its quick and gives good results. MicroRobotics ( no affiliation) keeps something like this.

This is what I am looking at as well as @Michon and @Steerpike sent me some pictures of PCBs they made on the kitchen stove this way.

Title: Re: Quad 303 restoration
Post by: Nchebe on July 11, 2019, 10:30:16 AM
Homemade is definitely the way to go.  It's not too difficult, plus you'll get the original phenolic-paper pcb material to boot.  Profiling might be tricky though, phenolic-paper breaks quite easily, so go carefully!
Title: Re: Quad 303 restoration
Post by: mygoggie on July 11, 2019, 10:42:14 AM
Homemade is definitely the way to go.  It's not too difficult, plus you'll get the original phenolic-paper pcb material to boot.  Profiling might be tricky though, phenolic-paper breaks quite easily, so go carefully!

Any idea where to get the original phenolic paper PCB material @Nchebe ? I know @Family_Dog recommended to steer away from this, but if I want to stick to original looks this might be the only way to go.

I see CEM-1 boards are more or less the same material, but is white in colour.
Title: Re: Quad 303 restoration
Post by: Nchebe on July 11, 2019, 11:13:57 AM
I last saw it at Communica and Mantech, but not sure if they still have??  Websites say they don't :vsad:
I'll scratch around at home and see if i have any...
Title: Re: Quad 303 restoration
Post by: Nchebe on July 11, 2019, 11:43:02 AM
RS has, but not ex-stock. 4-6 days to get in.  RS stock code 433-927.
Title: Re: Quad 303 restoration
Post by: DACMan1 on July 11, 2019, 11:51:07 AM
Yep, that is the main reason why I went with the recommended manufacturer in SA. When are you doing a run again so that I can see if I can pool my few boards with yours?
https://jlcpcb.com/ has better prices on shipping - but expect to pay ~R600 for courier.
Title: Re: Quad 303 restoration
Post by: ALF on July 12, 2019, 10:43:39 AM
This looks like an cheap and easy root not sure if this was mentioned before
https://www.ebay.com/itm/Classic-45Wrms-ch-amplifier-PCB-Quad-303-kit-set-of-three-pieces-/321469269352
Title: Re: Quad 303 restoration
Post by: mygoggie on July 12, 2019, 02:09:30 PM
This looks like an cheap and easy root not sure if this was mentioned before
https://www.ebay.com/itm/Classic-45Wrms-ch-amplifier-PCB-Quad-303-kit-set-of-three-pieces-/321469269352

Yip that is the cheap and easy route. Something I do not want to do as I want to keep as close to original on this project. Thanks in any case for the heads up!!
Title: Quad 303 restoration - Regulator and output board PCB
Post by: mygoggie on July 22, 2019, 10:13:56 PM
Out of the blue one of our fellow forumites contacted me and offered to help me redraw the PCBs electronically in CAD to obtain the required Gerber files. I am ever so thankful.

We are working on the regulator board at the moment and taking it small steps at a time to make sure the end product will be as close as possible to the original.

More news on this journey later!
Title: Quad 303 restoration - Thanks
Post by: mygoggie on July 25, 2019, 04:12:12 PM
I asked @Family_Dog to do a post insertion in the first post of this thread (https://www.avforums.co.za/index.php/topic,76695.msg898987.html#msg898987). Here I am listing and thanking everyone who has contributed to the project. Let me know if I have forgotten to add your name!
Title: Re: Quad 303 restoration
Post by: Schalk on August 13, 2019, 12:13:09 AM
You could send me the top cover of the tuner and I'll pop around to a Ceracote specialist. Might be able to match the color pretty close which will see me ordering a small 4oz tester from the States. These can be had in an air dry version which is different to the oven cure type I use. This will of course mean spraying all the covers just to be sure the color matches perfectly. Only caveat being the front panels being printed so I would not think those should be done. Worth a try, as ceracote simulates closely the pearlescent appearance of the Quad paint.

I'll not charge for the spraying if an option and a suitable color match can be found in their range. Guaranteed not to wipe off with ANY type of thinner or acetone  :thumbs:
Title: Re: Quad 303 restoration
Post by: Skylark on August 13, 2019, 01:33:19 PM
You could send me the top cover of the tuner and I'll pop around to a Ceracote specialist. Might be able to match the color pretty close which will see me ordering a small 4oz tester from the States. These can be had in an air dry version which is different to the oven cure type I use. This will of course mean spraying all the covers just to be sure the color matches perfectly. Only caveat being the front panels being printed so I would not think those should be done. Worth a try, as ceracote simulates closely the pearlescent appearance of the Quad paint.

I'll not charge for the spraying if an option and a suitable color match can be found in their range. Guaranteed not to wipe off with ANY type of thinner or acetone  :thumbs:
That sounds interesting, what is ceracote I've never heard of it before?
Title: Re: Quad 303 restoration
Post by: Schalk on August 13, 2019, 01:49:53 PM
https://www.cerakote.com/finishes/
Title: Re: Quad 303 restoration
Post by: Skylark on August 14, 2019, 01:50:54 PM
https://www.cerakote.com/finishes/
Thanks, who sells it in Sa?
Title: Re: Quad 303 restoration
Post by: mygoggie on August 14, 2019, 02:09:39 PM
Thanks @Schalk I will look into this for sure! Let me just get my daily life back in order. Had a run of not so good things happening the last few weeks.
Title: Quad 303 restoration - Thanks
Post by: mygoggie on August 16, 2019, 10:44:04 AM
Never in my wildest dreams would I have thought that this thread will have 10 000 views!

A big THANK YOU to everyone that has been participating, reading, advising and offering help.  :dop:
Title: Re: Quad 303 restoration
Post by: christowp on August 16, 2019, 12:19:15 PM
Just to say I admire your diligence and patience in this process. I would have freaked by now - too long for me.
Title: Re: Quad 303 restoration
Post by: peterc on September 07, 2019, 07:15:25 PM
Even though I have subscribed to the 2 threads I have received zero notifications.....  Damn.

Herman, If you need boards done, I can help with home-made PCBs. If you can send me a PDF or a graphics file I can do them. Single sided only, please!

I do everything manually so I cant do fancy holes or slots etc. No silkscreen layer either...

I spray the tracks with Kantakt SK10 which makes soldering a breeze.

Surprised to hear about Bosco, they have made thousands of PCBs for me in the past, with only 3 bad boards. But their attitude can be absolutely atrocious sometimes.

Here is a link to a project I made the PCBs for.

(https://i.postimg.cc/MTnwkrVc/Peter-PCBs.jpg) (https://postimg.cc/r023xjhc)




Title: Re: Quad 303 restoration
Post by: mygoggie on September 09, 2019, 07:57:54 AM
Hi @peterc sorry to hear you missed out on some of the fun we have had here!

If you can be of assistance, it will be great. Another forumite is redoing the PCBs in gerber format. I am behind in my tasks regarding this and he is waiting for me!

PM me your details then I will be in touch!

Thanks again. :dop:
Title: Re: Quad 303 restoration
Post by: Nchebe on September 09, 2019, 12:47:33 PM
Hi Herman...

No rush!!!  When things have settled down and you're ready...  I did however find that piece of phenolic PCB stashed away in the depths of  :angrywife: nightmare - my workroom...  It is double- sided copper though.  I'm sure we can get it smooth and polished on the top side once copper is etched off.
Title: Re: Quad 303 restoration
Post by: mygoggie on September 09, 2019, 05:06:12 PM
Hi Herman...

No rush!!!  When things have settled down and you're ready...  I did however find that piece of phenolic PCB stashed away in the depths of  :angrywife: nightmare - my workroom...  It is double- sided copper though.  I'm sure we can get it smooth and polished on the top side once copper is etched off.

Thanks for the heads up Lance. I have opened the files you have sent and will compare them tonight.
Title: Re: Quad 303 restoration
Post by: ghostinthemachine on September 10, 2019, 09:51:26 AM
A heads up on the original Bulgin power plugs ...

https://za.rs-online.com/web/p/compact-power-connectors/0488400/

https://za.rs-online.com/web/p/compact-power-connectors/0489504/
Title: Re: Quad 303 restoration
Post by: mygoggie on September 10, 2019, 11:35:06 AM
A heads up on the original Bulgin power plugs ...

https://za.rs-online.com/web/p/compact-power-connectors/0488400/

https://za.rs-online.com/web/p/compact-power-connectors/0489504/

Yep, those are the ones. Thanks!

The Quads however came out with a 90 plug top which is this one on Mouser: https://www.mouser.co.za/ProductDetail/171-PX0430-SE

I think I will go for the original look.
Title: Re: Quad 303 restoration
Post by: simeli on September 10, 2019, 04:58:54 PM
I think the original Bulgin plug is actually this one
https://za.rs-online.com/web/p/products/0489510/
Title: Re: Quad 303 restoration
Post by: mygoggie on September 10, 2019, 05:24:01 PM
I think the original Bulgin plug is actually this one
https://za.rs-online.com/web/p/products/0489510/

Yep, that is the one I will be buying.  Bulgin Mfr. Part No. PX0430/SE
Title: Re: Quad 303 restoration
Post by: mygoggie on October 01, 2019, 10:29:51 PM
You could send me the top cover of the tuner and I'll pop around to a Ceracote specialist. Might be able to match the color pretty close which will see me ordering a small 4oz tester from the States. These can be had in an air dry version which is different to the oven cure type I use. This will of course mean spraying all the covers just to be sure the color matches perfectly. Only caveat being the front panels being printed so I would not think those should be done. Worth a try, as ceracote simulates closely the pearlescent appearance of the Quad paint.

I'll not charge for the spraying if an option and a suitable color match can be found in their range. Guaranteed not to wipe off with ANY type of thinner or acetone  :thumbs:

@Schalk would you mind popping me a PM with your cell number so that we can chat about this? I only had time now to look into this. The front panels are not an issue as another forumite has offered to UV-print the text on the finally painted plate.
Title: Re: Quad 303 restoration
Post by: Mongoose on October 10, 2019, 07:09:26 PM
Awesome thread man, and thank you for sharing. Lots of dedication going into this build  :thumbs: :thumbs: :thumbs:
Title: Re: Quad 303 restoration
Post by: Schalk on October 17, 2019, 11:12:24 PM
Hello Herman? Quite sure you are not really your own Goggie...

I am very difficult to get hold of on the phone. Rather just pop me an old fashioned email at valveaudio@absamail.co.za and I'll respond in kind? Let's get this off the ground.

Regards
Schalk
Title: Re: Quad 303 restoration
Post by: mygoggie on October 18, 2019, 03:37:41 PM
Hello Herman? Quite sure you are not really your own Goggie...

I am very difficult to get hold of on the phone. Rather just pop me an old fashioned email at valveaudio@absamail.co.za and I'll respond in kind? Let's get this off the ground.

Regards
Schalk

wilco @Schalk
Title: Re: Quad 303 restoration
Post by: mygoggie on October 18, 2019, 03:38:26 PM
I have been a bit quiet on this thread. The reason is here (https://www.avforums.co.za/index.php/topic,82803.0.html).
Title: Re: Quad 303 restoration
Post by: Schalk on October 18, 2019, 07:51:26 PM
I have been a bit quiet on this thread. The reason is here (https://www.avforums.co.za/index.php/topic,82803.0.html).

Yup, thanks for your reply Herman. That project is going to take a while  :faint: I admire your resolve in tackling and finishing stuff!
All the best, however long it takes, I should still be around when you decide to move on the Quads.
Title: Re: Quad 303 restoration
Post by: mygoggie on October 25, 2019, 07:53:25 PM
Yup, thanks for your reply Herman. That project is going to take a while  :faint: I admire your resolve in tackling and finishing stuff!
All the best, however long it takes, I should still be around when you decide to move on the Quads.

Yep @Schalk , it is been a few years since I started out with the greywater system and revising and revising till it works. The water harvesting is now in its second year. Time and money is as always the dictating issue!

I have sent you an email re painting the Quads. Let me know if you do not receive it.
Title: Re: Quad 303 restoration
Post by: mygoggie on November 04, 2019, 08:28:10 AM
I decided to calculate the total surface area that needs to be sprayed for the Quad 303. So I went and carefully unwrapped the stored steel parts. I nearly lost it ...

What looked like quality plating turned out to be a disaster. All the parts have started to corrode!  :sd: :facepalm: :Ooooooh: :sulky: :nono:

(https://i.postimg.cc/GtrpVWC4/IMG-20191104-081209.jpg)


(https://i.postimg.cc/vB5BPQpR/IMG-20191104-081215.jpg)



And so much more worrisome was the Quad 33 front plate that will not be painted.

(https://i.postimg.cc/D0gzTxvB/IMG-20191104-081037.jpg)




I will mail the plater now and ask what the heck they are going to do ....
Title: Re: Quad 303 restoration
Post by: mygoggie on November 04, 2019, 08:47:16 AM
So, I have mailed them. Let's see ...

Back to what I originally started off, the surface areas.

On the Quad 303 the total area of the surfaces to be painted are as follows:


Title: Re: Quad 303 restoration
Post by: mygoggie on November 04, 2019, 09:05:00 AM
Hello Herman? Quite sure you are not really your own Goggie...

I am very difficult to get hold of on the phone. Rather just pop me an old fashioned email at valveaudio@absamail.co.za and I'll respond in kind? Let's get this off the ground.

Regards
Schalk

Hi @Schalk I have emailed you as requested, but have received no response to date. Kindly check ...
Title: Re: Quad 303 restoration
Post by: mygoggie on November 04, 2019, 10:01:39 AM
The plating company came back to me and asked that I return the parts ASAP so that they can fix these.

Good news and I am really glad they have business ethics.
Title: Re: Quad 303 restoration
Post by: Schalk on November 04, 2019, 04:16:02 PM
Hi @Schalk I have emailed you as requested, but have received no response to date. Kindly check ...

Hello Herman, my apologies for being absent (even though I am on the forum once in a while). Time a wee bit tight at end of year. I am glad they decided to man up and do the work. I do spray painting in free space, not a spray booth. I would not want to upset you more than the platers.... However, I do think I have this process well covered otherwise I would not have offered.. I'll be in the wings if you get a bloodied nose once again from the platers  :be:

Best regards, Schalk
Title: Re: Quad 303 restoration
Post by: mygoggie on November 04, 2019, 04:23:18 PM
Thanks for the reply @Schalk ! I will chat to you on email about my plans. Let me first get the plating redone. I will need to check the 303 chassis as well as that is already partially assembled.
Title: Re: Quad 303 restoration
Post by: mygoggie on November 05, 2019, 02:21:33 PM
Dang ... the 303 chassis has also corroded, so I had to strip everything I have assembled from it. It will go back to the platers as well. Dunno what the heck they did but the coating IMHO is way too thin to offer any protection.
Title: Re: Quad 303 restoration
Post by: mygoggie on November 06, 2019, 09:33:24 PM
I handed the parts in this morning and got an email this afternoon to please come and collect. Let's trust that this time round it will be done so that no rust will appear!

In my rush this morning I forgot the 33's chassis. Will take it in when I collect the others. Too many things ... :sweat:
Title: Re: Quad 303 restoration
Post by: mygoggie on November 08, 2019, 04:35:52 PM
Crazy world we live in at the moment. Load shedding saw our supply being switched off at 2h00 and when the supply went on at 6h30 it immediately shut down. In this time, some brave gentleman offered to clean the main sub-station of old equipment and copper ...

Supply only came back on now after 14h.

Anyway I spent the time in town, making my water purification skid's shopping list a bit shorter and collecting the replated Quad 303 and 33 parts. Looking good this time round.

(https://i.postimg.cc/4xT605J7/IMG-20191108-130115.jpg)
Title: Re: Quad 303 restoration
Post by: mygoggie on November 10, 2019, 03:49:31 PM
Just to be double sure I am not running into an oxidation issue again I dunked the 303 and 33 chassis into @Family_Dog's SAF-DEM dupa.

I am hoping this will seal it just that little tiny extra bit required.

All nicely dried and ready for assembly. The rest of the parts I will coat with a layer of primer to make sure that those are seals as well.

(https://i.postimg.cc/7LBsfYF1/IMG-20191110-153310.jpg)
Title: Re: Quad 303 restoration
Post by: Family_Dog on November 10, 2019, 03:59:55 PM
Interesting, not sure if it will assist against oxidation as this is hardly a problem up here ;)


-F_D
Title: Re: Quad 303 restoration
Post by: mygoggie on November 13, 2019, 05:31:40 PM
Call me a tad crazy but @Michon sold me another Quad 303. Oh well, while I am busy I can just as well do another in tandem.

(https://i.postimg.cc/zD6R8LRh/Whats-App-Image-2019-09-15-at-17-42-40.jpg)



The PCBs I will replace, the rest looks in rather good conditions compared the one I started off with.

(https://i.postimg.cc/85sjVDpw/Whats-App-Image-2019-09-15-at-17-42-35.jpg)
Title: Re: Quad 303 restoration
Post by: williamkelly on December 02, 2019, 06:53:02 AM
Out of interest what did you plate with? I did MGA manifold in nickel and it a) looks great and b) will outlast the car.
Title: Re: Quad 303 restoration
Post by: mygoggie on December 02, 2019, 08:00:37 AM
Out of interest what did you plate with? I did MGA manifold in nickel and it a) looks great and b) will outlast the car.

Normal bright zinc plating.

Where did you have your nickel plating done? I am looking for a quality plater for nickel plating.
Title: Re: Quad 303 restoration
Post by: williamkelly on December 02, 2019, 05:12:29 PM
I have to admit that I was thinking I would be asked that. It was some time ago, via a friend. I understand them (remains beyond my brain cells to recall the exact name) to have gone belly up subsequent. It was a matt finish, but specifically done to handle high heat. It probably hinders you more than helps you I'm afraid, but I would have thought nickel would have been pretty good as a material for longevity and corrosion prevention?