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Looking for a new Amp or Preamp? If you're after tubes, post over here.

You've got....

a small signal transistor that's become unstable. This isn't an uncommon thing. It will have to be located and replaced. Odds on favorite, you can probably hear a bit more noise out of one channel even when its not 'doing its thing'.

First isolate it to the preamp or the power amp. Then go from there....I used to use freeze spray (freon in my day) and a soldering iron to see if I could trigger the little offending device into acting up.

Cheers,

David


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