Re: Capacitor coding help please
It sounds like a biasing problem in the output stage or thermal runaway due to leakage in one or both of those output transistors in the copper heatsinks. The adjustment pot on the circuit board should not be adjusted unless you know what you're doing. The pot itself could have a dodgy contact, but any cleaning or replacement would mean careful readjustment with a test meter and service information. There's other possible causes of the distortion that you mention, but saying exactly what it could be is really only guessing, and that's never a good idea if you're a novice.
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