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RE: Troubleshooting a JE Labs 300b amp

It has been a gradual fading. I did not mention that I have tried virtually every combination in my system - like swapping tubes from the good amp to the troubled one, swapping speakers between sides, swapping cables between sides, and the bass and midrange always sound diminished on the one amp. There is no humming or crackling; I have not had to adjust the variable resistor between the 300b heater legs.


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