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Gray audograph
I have a Gray Audograph BID-5 dictation machine that I just finished restoring. I took photos of the three boards where the wires connect, but the photos are hard to see cause of the cheap quality of my old cellphone. I have no clue where a few wires went as it has been a few months since I had started on the restoration. Does anyone have pics of the inside of theirs or have a schematic? This one uses two 35C5 tubes in push pull. Not sure how much power output it has though.
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Main system Scott LK-72A amp & LT-110 tuner Garrard Zero 100C turntable AKAI GX 255 RTR iPod & computer DIY speakers (upgrading them soon) |
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I initially was getting no B+ voltage and the tube fiilaments were not very bright (string fed by B+) so I puzzled over it for awhile then I remembered I had taken photos of the back. I looked and yes I had forgotten a jumper wire to the first filter cap from the rectifier after a resistor. I now got correct B+, but still no sound. I then found one of my 35C5 tubes lost its vacuum. Once I get the two 35C5 tubes in the mail I will power up via isolation transformer, feed an audio signal generator to where the cartridge connects and using my oscope I will see where the signal stops. Given the way the PC board is (point tom point wired with wire and component leads) it could be anything from a component lead touching, a wire broken, ETC...
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Main system Scott LK-72A amp & LT-110 tuner Garrard Zero 100C turntable AKAI GX 255 RTR iPod & computer DIY speakers (upgrading them soon) |
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