Author Topic: How restorable is this? Philips B6X radio  (Read 627 times)

Offline El Sid

  • Trade Count: (+11)
  • AVForums Veteran
  • ***
  • Posts: 980
How restorable is this? Philips B6X radio
« on: December 26, 2017, 02:03:43 PM »
Perhaps after too much Christmas spirits, my bro-in-law and I decided that I'd have a stab at restoring his old Philips radio. The model number is B6X63A. It's actually a receiver I suppose - it has inputs for a tape and turntable. I had a brief look inside, and most of the valves seem to be more or less available - there are EL 84s in there for example. The exterior is not too difficult, so no issues there - he has found a similar fabric for the speaker grill somewhere online. I haven't been able to find this model on the internet yet.

Looking at the photos of the inside, there are two things that jump out. The first is the broken ferrite core in the RF section -  can anyone conversant with the RF "dark arts" tell me if there is a way of sticking it back together, or does it need to be replaced? That could be a problem. Also, there may or may not be a missing valve next to the failed rectifier tube, so i need to find a circuit diagram, but I think the mounting bracket is a part used in other models too, so intentionally left blank. 

I will also check all the valves (I'll ask a forum friend that has a tester), and if any are irreplaceable/not interchangeable then I won't go any further - maybe just do the cosmetics. If the valves are ok or can be replaced without too much trouble, then I guess I'll go ahead - starting with replacing all the caps and just checking all other components. It obviously needs a massive cleanup.

There are some quite cool features on this unit. In the "shield" type decoration in the fascia is some sort of indicator device - it can also be seen from the back between the two speakers. It is i think more than just an indicator light because it is packaged in a valve body and has more than two pins. Also, there is a sort of small mechanical EQ display showing the frequency response - when you turn up the bass for example the red line goes up on the left.

Any opinions on how doable this is? I've never tried anything this old. Note that I reserve the right to ignore any sensible advice.










Offline El Sid

  • Trade Count: (+11)
  • AVForums Veteran
  • ***
  • Posts: 980
Re: How restorable is this? Philips B6X radio
« Reply #1 on: December 26, 2017, 02:24:13 PM »
An update - the closest I've been able to find is a Philips BX653A - https://www.radiomuseum.org/r/philips_bx653a.html. Looking at the photos it's very similar inside, in fact the electronics look the same.

The indicator is an EM80 magic eye tuning indicator - I hope that's OK because it's very cool. Here is one on youtube: https://www.youtube.com/watch?v=PO_h0LH_06c

Offline KOD

  • Trade Count: (+2)
  • AVForums Member
  • ***
  • Posts: 198
Re: How restorable is this? Philips B6X radio
« Reply #2 on: December 26, 2017, 03:07:43 PM »
Hi

Eminently restorable IMHO because it has FM. The hole next to the rectifier is just that, a hole and nothing more. The rectifier should be an EZ80 (or EZ81) easily obtainable. I have no more, my last used one I fitted to my Philips chassis which I donated to Steerpike's collection some time back. See image below. Quite similar but with FM so yours is obviously a later model. Intriguing are the three sockets on the rear, is one perhaps for an external speaker and when used with the internal speaker could be for stereo? I cannot discern a balance control on the front panel. Mine had the same cute bass/treble ribbon indicator. You should be able to join the ferrite rod with superglue after the broken faces have been well cleaned. If you look at some of my previous posts about old radios this should be worth a pretty penny on Milner/Long/5th/ Queen Street once up and running. Enjoy.

Season's greetings and Regards Keith.

https://s6.postimg.org/v4lr7rf7l/P8161590.jpg
Grundig/Eddystone/B&O/Montgomery Ward/NAD

Offline Des Miles

  • Trade Count: (+1)
  • AVForums Veteran
  • ***
  • Posts: 242
Re: How restorable is this? Philips B6X radio
« Reply #3 on: December 26, 2017, 03:20:32 PM »
If you do decide to do a full  restoration then give me a shout (PM) I'm pretty shore I have spares of all the valves required for the set, which you are welcome to. 

Online Family_Dog

  • Administrator
  • Trade Count: (+23)
  • *****
  • Posts: 8,203
  • STEEL & GLASS - Everlasting Beauty!
    • Repcom 2-way Radios
Re: How restorable is this? Philips B6X radio
« Reply #4 on: December 26, 2017, 04:20:23 PM »
Please clean it up and repost the new pics. If what I see is the broken section of ferrite rod at a sideways angle, just superglue the ends together again. Ferrite rods are only used for AM, MW or SW, and not required for FM reception.

Definitely an item suitable for restoration!


-F_D



-Eric

That Guy in South Africa...
*************************************
http://groups.yahoo.com/group/vintage_tube/
*************************************

Offline KOD

  • Trade Count: (+2)
  • AVForums Member
  • ***
  • Posts: 198
Re: How restorable is this? Philips B6X radio
« Reply #5 on: December 26, 2017, 05:24:11 PM »
I have a circuit diagram. PM me for a copy. This is not in fact stereo, it has a so-called Bi-ampli output stage, one EL84 drives the large speaker and the other the smaller one. One of the sockets on the rear is for an external speaker driven by both EL84's. Should sound pretty good. Also, like my one, the ferrite rods are adjustable from the front panel for best AM reception.
Grundig/Eddystone/B&O/Montgomery Ward/NAD

Offline El Sid

  • Trade Count: (+11)
  • AVForums Veteran
  • ***
  • Posts: 980
Re: How restorable is this? Philips B6X radio
« Reply #6 on: December 26, 2017, 05:59:40 PM »
Thanks all for the responses - that's very encouraging! Esepcially from KOD and FD re the ferrite rod which i was worried about.I am going to give it a go.

It took me a while to find this on the internet because I had a typo - BX663A instead of B6X63A.  Based on the photos, the BX653A seems virtually identical on the inside, particularly the electronics, and I've managed to find a service manual (in Dutch but it's 95% comprehensible). So i think I'll have the info I need. I'll probably only get going with this in mid-Jan - will make a thread.  The valves it uses are: ECC85, ECH81, EF89, EF85, EABC80, ECC83, EL84, EM80, and EZ80. What's the availability like on those? (EL84 I have). I'd imagine the more specialist RF valves are more difficult to come by than the audio.

Hi

Eminently restorable IMHO because it has FM. The hole next to the rectifier is just that, a hole and nothing more. The rectifier should be an EZ80 (or EZ81) easily obtainable. I have no more, my last used one I fitted to my Philips chassis which I donated to Steerpike's collection some time back. See image below. Quite similar but with FM so yours is obviously a later model. Intriguing are the three sockets on the rear, is one perhaps for an external speaker and when used with the internal speaker could be for stereo? I cannot discern a balance control on the front panel. Mine had the same cute bass/treble ribbon indicator. You should be able to join the ferrite rod with superglue after the broken faces have been well cleaned. If you look at some of my previous posts about old radios this should be worth a pretty penny on Milner/Long/5th/ Queen Street once up and running. Enjoy.

Season's greetings and Regards Keith.

https://s6.postimg.org/v4lr7rf7l/P8161590.jpg

And greetings to you too Keith. The BD653A has got two rectifiers - I wonder if they tried to economise by only having one, making it work a lot harder, and thus its being more likely to fail?

The sockets are two inputs for tape and TT, and the other is for an external speaker. It's not stereo though.

If you do decide to do a full  restoration then give me a shout (PM) I'm pretty shore I have spares of all the valves required for the set, which you are welcome to. 

Thanks for the offer Des - will do once I know which ones I need. See the list of valves above.

Please clean it up and repost the new pics. If what I see is the broken section of ferrite rod at a sideways angle, just superglue the ends together again. Ferrite rods are only used for AM, MW or SW, and not required for FM reception.

Definitely an item suitable for restoration!


-F_D

Thanks FD - I'll definitely start a thread once I get going. I even have a mate who does veneering and lacquering, which should come in useful.

I have a circuit diagram. PM me for a copy. This is not in fact stereo, it has a so-called Bi-ampli output stage, one EL84 drives the large speaker and the other the smaller one. One of the sockets on the rear is for an external speaker driven by both EL84's. Should sound pretty good. Also, like my one, the ferrite rods are adjustable from the front panel for best AM reception.

Yes I saw the biamplification - the logo in the bottom right of the speaker grille says "biampli". So it was already being done in the 50s! Thanks - I'll PM for the circuit diagram in case it's clearer than mine
« Last Edit: December 26, 2017, 06:04:05 PM by El Sid »

Offline handsome

  • Trade Count: (+1)
  • AVForums Veteran
  • ***
  • Posts: 872
Re: How restorable is this? Philips B6X radio
« Reply #7 on: December 26, 2017, 06:59:24 PM »
Dont stress about the rf valves just yet - in my experience they last a long long time ditto the preamp valves (ecc83). Replace the electrolytic capacitors and any oil filled coupling caps. Then see how it sounds: you might need to replace the EL84s. RF valves are actually quite plentiful because no-one uses them anymore!

Online Family_Dog

  • Administrator
  • Trade Count: (+23)
  • *****
  • Posts: 8,203
  • STEEL & GLASS - Everlasting Beauty!
    • Repcom 2-way Radios
Re: How restorable is this? Philips B6X radio
« Reply #8 on: December 26, 2017, 07:06:52 PM »
As Mr.Handsome suggests, the small signal RF and AF valves last practically forever. The EL84 and EZ80 rectifier (I really would have expected an EZ81 to have been used) will probably require replacement. I can assist with ECC85 and ECH81 if necessary, have quite a few of those in stock, NOS Philips.


-F_D



-Eric

That Guy in South Africa...
*************************************
http://groups.yahoo.com/group/vintage_tube/
*************************************

Offline KOD

  • Trade Count: (+2)
  • AVForums Member
  • ***
  • Posts: 198
Re: How restorable is this? Philips B6X radio
« Reply #9 on: December 26, 2017, 08:26:50 PM »
Hi F_D and Season's Greetings.

The diagram I have calls for an EZ81 for rectification.
Grundig/Eddystone/B&O/Montgomery Ward/NAD

Online Family_Dog

  • Administrator
  • Trade Count: (+23)
  • *****
  • Posts: 8,203
  • STEEL & GLASS - Everlasting Beauty!
    • Repcom 2-way Radios
Re: How restorable is this? Philips B6X radio
« Reply #10 on: December 26, 2017, 09:01:31 PM »
Thanks for the confirmation, Keith and Seasons Greetings to you too. I figured the EZ80 mentioned in the line-up above was a bit light for two EL84s, although I did not look up specs of the rectifier.

That radio should produce quite a pleasing sound once the resto is complete.


-F_D



-Eric

That Guy in South Africa...
*************************************
http://groups.yahoo.com/group/vintage_tube/
*************************************

Offline El Sid

  • Trade Count: (+11)
  • AVForums Veteran
  • ***
  • Posts: 980
Re: How restorable is this? Philips B6X radio
« Reply #11 on: December 26, 2017, 10:07:35 PM »
Yes it is a single EZ81 - I didn't have the right schematic for the B6X63A when we spoke about it first. I haven't had a detailed look, but that seems to be almost the only difference between the B6X63A and the BX653A