Mars Octal Phono

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Mars

AVForums Super Veteran
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Joined
Mar 23, 2009
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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:

VSCbBpmxQK-F8BeWKqFg2RQdGURtsV5sUZ4Nqt0DlYU4dpWnt_lKEMRtlatNYRGPnFt_NDA5gDdqC6GfGiSeVMbB5hi6vFEmGzuAQ5mtP1eJN8Rop2g-xV8D7WX6Pi93gKYfja92NTlMZQpLOK5H1w7Pco_AC0DD-cMsQndR7Nk6PVdf_iGxFX5P44JUrtVmO3-uqKxAFg0Jf48uWdS3YnSdt_S_gXpCGgizL62QeS90Wnb4_0v7ITzghSnzbDqxvcZ2VHasQOn4Y8W_d9nseNoo7pdFPZDquWn2uVTBwROCBG58S1dmvF7sMP2YMxv0tjpn3hJcUZwIXCj_5IAmmN6f8wY-J_k9Ya385zi3rbU5rcx_ffAeiORMdtNPOVCje_BfOiklEJUHizWY3q-aTtOY3PrbixXgSgK6iwTc5KXxqAD0TSMpnkXFwxfLeGkMPbuEkRq6eDiVJELrbkE8a7YirUvC4S4RlyYH3j61MupGIb1tRjvdK1smz75i0LILCxCa7tA7TN90eW-KBVFrLJbTAjl2WL2sGaBu_Iw59F-K-cW8CCjHmiIq_L2SctKlmCg-rZAsIaMHmkqvleYrRVlRrsWz65bcHq3H3BuIIrN3k8lm=w920-h690-no


Power supply inside:

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View of two phono stages:

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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:

w5DN4Lcxa3cZ2xZCUIMiXdUFAHi7N8o5jT45GIFwaDy4NpcnMV02lpXQeVcOhLXu08WJwmO14cBK5VXzf8tGoIbj-fSrHPXkDEDzX42xHXQ0aXmSIrch1YV3sZFFBD_nsX9GUsQPgx8PV8pGzjKHEYY4WfKTaQ0EjhUAtNHbA_4iBmrZAMQYhC5AXJHk7W4US-FhhZtwa-b6AdoivGQEOrK74CO39mB7AAf6s0KjZ8b79coWfJKNmBPEUFQWVLYLmSz0sVGzyHe7TxcOx7xob8wzadalPybZ1iQkKrf-jEI5EkD9gEQyZyjI_dMMBdh5woYUm-bqft--yfUyMGPEoBJy0FEtOvchfa8MmVmiC-m8JM-ddq8RzdJMABv8ZC7cskfiJTc50MlWd-KjhmXFRNNrd6GfvZf7cPaiOiXUprJLWZxFE97sDNfdBhKTIA5FaDjVOPd3ISo65ZyXXcoCnjimgX-Pn0kiYDW8m4ew6mAPVXid8z2cLVRCuhWYpfZTb2MY16iNEvprBNzhI8OQnJlNoR-iE3jYy_7bZOajJpY64Hm_qWUwc7hAwPKkO_vP9UOitDByUY2q33uAgw2YC-yy52UVJE7U2xCtU8udwUSIRF_g=w1144-h859-no


Cathode follower resistors:

ag9VygcPDel3jGwPgc6ntCP0VPKg5HHzrUvdWUkg4Pd5YyaGRW5VZ97VXXJGFfnZtWfvcxIGNBSrGZSyCIxbQ6Ph6tvB9mxpkaXhruIfm4ZarGT3eFllgr0tfgXoosp2EIIGii4aKcpEhZ8AeipZ8ozRT6ckr8YQ7KNw-7DIEF5vdhRcTlSuCO_aAbYlFnI3RYxb8kBNlLzYl9-cSmNUjFAkljzgxFl7WJRza--bl2lXYTfNLaT2Q0nqRBXbeRQS4W5W1_ZpVV_NISk1v_xTjYeen8sZ59dTJ6LGXEICviYMM05dL_s6ji6AAvlSTk8KX-jWNIJSVGY-8VL_ec2hWi7InG6VD7YdwkYNj8RrtnSfOaTa3H0jemIYnKKCbswBw710nzEzWW5ItWdlfFgeoEvzdQGbLTyXtVzDMMX4mymE5QGSPOCaS3BUYHb5kcIMMdedSiIYRcpOTTs3cbp2Nx3M-tzpzeteRVM2pGCRXmVvytkiDG_7vHRUYxopfsrPc2cNULPjHerDc0haoxoh36diB-aW247p1flQP7IZWzFqSutQVpsX9P8MYLm_OpA_qSU2ExjOzpJAOUEZPKlyqdDsNz_wensbEG6bE9k1tqgN1ieq=w644-h858-no


 

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