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tone defeat

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    SA 7100 trying to diagnose tone defeat making one channel kills or makes noise in right channel

    Hello, I am restoring a SA 7100, all fine except tone defeat is making noise/cuttirng in my right channel. been looking for schematics but to my surprise they were not alike the Board (see attached pictures, similar but not the same). 2SA726's are fine, resistors are ok, no sign of wear, I...
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    KA-7100, only get sound with Tone Defeat engaged

    Hello Everyone, I recently started working on a KA-7100 that I found on the sidewalk several years ago. I used a DBT and it started up okay. Initially sounded pretty scratchy and dropping out, but Deoxit on switches and pots + manipulation seemed to clean it up nicely. The one thing I found is...
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