Mars Octal Phono

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Mars

AVForums Super Veteran
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Joined
Mar 23, 2009
Messages
1,487
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Location
Paarl, Western Cape
I've completed the design of the octal phono preamp and took photos of the build:

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Power transformer and filter caps

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Top view:

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Power supply inside:

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View of two phono stages:

ZrurVFb0fZJuCYFHH8r0aq7SI2SIObo_PW6Qxixp7qGpCQQib2cmkFNZlWNZ9L8jgFR6eUHYUNTmwVAO_GK0cfXOYnM9WA1N9U07x9tSfZiZdPB0e87J7S4WFEoACFpcKdT_L1QtD_sfK-mEeW82FF_A9XLHumujHuy0xFQzPbHlhSUdxb-HcOp8p9pk41baLZATv4laIlh91S5_PdQWXnt7A7e_96D1kEoefyrCq8LL_hpMNxNFkqsiwDur6fHLGgHOfgOofvmzviWZ1Fyzh5SvGNhKL2fW3t2dDeXzAk0FeUX360DaAXXCijqaBNHx0xGCfRyyaV8wG07lzv_kgZEw3fVgFvyvGlsior7HUgDymWUdFFk3m2Yq_jrIEQmVt5HnZphAOfLVUrg4qdw92C1n0BxAe5oaqs_WbOfX-eFF7IYaHN8S3hgf6jWGcTA2E_LD1bzLfzHqyFsmRaTtuCbCXOgYyKXLXvRtuj2-hUXy8GVtARmmLn0ml1MSC8ZHgVkZQW54zBAJ0DH5t4Wj9sPi8kC4WGngGBOckUOOwwDid7HvmrJX23YL6AyxiDdph2cWy94cw-AoXx7bdtiYIb3pZnJ45B4eHS5NZQ7b2qfYGxA0=w1144-h859-no


1FhHD3Qu405C2whfhxOmDawvvuODI8oYu8dTpjSCWJj4PCZQEHO390OPrbWZs4J6sfZUkKf7G5R9bdQf7fAUhNclkd20F7XxU_gXggZYnlVlLHGccRuqKiOIYYLv_V1BOwdd5CFNCSw5ZHOaNUqx7l2MBZ0mCpY9w1neMRrzE7CMqKtrHqOkmsBoO_QuBMv0VA1zgFAX8OR_UztgdxcTZV2Ba_YnMXqqI-drSfUHrmPybLVPpRQ6eNjc6Mw0YtHDLmtMZgY986nptoVEgnmf7q4GawaH0dgwYCN0s2c6-j7hXczybmlX9-sC9v18TsF9lgFeVBzQCyUuPSqgTwbe0lAKhdPKYQ7XlserzN4D_u0BlmMVLOXJpJQemWilPBCrw-tRhOcnuyWlwL4AklDnJm6hgcWEuKLmeQlQPoWXnOYGcvLNr3C-vkPBVm05-ZM_SlG7I88HrdLvHSl1bXuqXsQ_7j6HBb7PCgHoYqphvZtv3e4FR3hNoHM6eYPdzBTnfmnL5Y4baJDxP0dHofwD7hECRorwzdBgtM2CB4lTM5Ccvn-w_a4misnzrZ1YdmBMOBw8H157Q7zLWDtM5EG75y1WiQpfmZdcAjHTaw4YbAVRp6gC=w1144-h859-no


CUhMsWM6HO-l1EvyP7u9D7ERvrhz2H1GKwC9JIUjSIg1feAafZFtKr84crG4QsdqCMl4mPgYA2JA3lgCB7ff11nnornJksyzi_TO0KlMuk3OS0XiAp-XZFWjWsUwCAFqL2Co6d4y25qH2UM91vyQYFefSTlggjWoH5z9HSQrspX28hdlJM_7UZq02iBSXPysAMmfr0LDR04hcK3uUnrBOEqPCIvU-K9rqcaWoL_ZTkYd1lLzlchxXPFKRapqvrQeNTX0SAf011oCucWcSfhoYLPsAhnY_0CZpAe4w5BSOrb_aCsGNf5yF4fV_QN-kvfQwNCV5XtLS7vN8qCjV3dGlx2nanzrxmGOkDUo7O6aXpBBFcbS3xeKS8gkcRkUb8MO-Ld7priNbf44VV9mXqOB2yDkQUvl5DGBWHX9Bpn7xw2zxJL6MsofqCkI82HDLs-fDgDujvI2lAXpDrfnU0yRb3Vcoq1AADIurJ7e6rIznVSF1He6sZ8kCyILPMJ4KcBhnUgc_j3jl-IfS3hawHc9wMOyQKnHNdDg_fX9zR_U_Yu3HYn_Idz7IQoSPJ7UjEPry_c-xvcLGGdaAqnz6wmmN4ZjxPpDoabcpZmQA18ox38xCqoJ=w644-h858-no


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m9Hkr7OGt4s-6uSyyGdHXQWIcBCUxhobj_yKA0wa_Xhby12L3YUiEfdPL7Ir74ZQs1fKJfyRPYbJ5_vhl6f8plEfi6mrJjL5HsgwvqGEGqLPqQKnhb1RoMjL3FuPdfWxAD2mC9qu228Fx5QG_reig-_6DcrPn8RfhyrNzZUL3PzpgJhqUAa5YF2aCa0LZcZobzeLoxl4YdnurPqYbbZ6ykRdYisfcfeDeSFYqs7GpFiNowpWHPqJ6mcmGMqtYj5G69QCZpnIc-U0tkN4_BjGYMGdDiad_MziFACcVufYdloNHA46GxpanBu2g_kPtQOBpg9JV6PaPiYvrA7NZfT0Ome_jzeW3hIRyleSeNiZ-2YOUgfx2AbdemK2V4ayVS2WqyvmGSyhj99wvIMS8wIn5ZdLmKHLPWNPW4bLPNgTZ52q1dCcTwgGKG3j7dKnSnmn5mG-RdthCapxp0ZVUHTCdQ8-XQzkIWZq9dW2w6cwMeUH2F1C4yaIuwRYx8gi6lhVI4grA58Skc3c7-BON4WiW5PCp2W6kTXWJU9xQUE90SEsxWDFE8s94Ntib2pYVcTeAwnq2aBFbJCO_iqG1oWOZfU33oFVhsLuiQFV-qu1GY-DGmBK=w1144-h859-no


CQL9FUrle__gGIesKejjIp9dJQs-exM_NIsYjeDYQURL4VQ2JxaEA7xlFkEvGn7egxO3u-cK8JawL0GjHj22egFjgVplammDoj1-tz-4xflxakKzpbeN48OmAtQXZyStm-eyzvnkD9nUxzHFKAO8Y2MF1w0tQ3sCwFzf7ES3auOtKbqz8J6yc4mwBI-MqlWmMMtJQoht3gM70dGeQRylMawzR7oxs9coe1z67AiAJ2wRA4eyJin70N2n6oaErWWP5yRvuAi99B9yVLvLUsri0gWCRMDvmYIYrVWinmX7f4Y-sZ9TTVi4lUkC909igMNReFhkDhAq00C1vcjyqDMaUrf-XOrQtoDYQkaUFmO18mmKuDi5jQqpGaHDRe8fIIHzkhpQunMiKD0ySPMu4_dlGHTTkARSqa1WlnV9oeyFYSv1mGBWgRrGyiNgp8bn2yOShikpv3CqKWIsN1xk2EA5SOw9eEt4jw4SABrDQj84MhN9mlVyA3q4k_wLdsn0XcqXUf4dX6a4tHNh0v0oBB0jnIxB1NKYUza_6ji92RTsl8MEi8wyoQYREJknK22XAm-YTKzbQhHVbTyTcQbQ-0OA4csZuwt-Rj7k2zoEUMaPA1tfaWIg=w1144-h859-no


Outputs to RCA:

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Cathode follower resistors:

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