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#3
02-02-2010, 11:48 AM
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open filter cap will not bypass the audio, getting around the preamp tube directly into the power amp tube. So an open decouplier and a defective preamp or VC would maybe do what you describe.
the vc is easy just jumper the middle to the hot side. does it hum loudly when touching the vc middle? Check for an open coupling cap on the audio tube grid Agree with previous poster sounds like a flter cap, one or more section prob open. once that is done, check voltage on tubes look for plate and screen voltages, check high watt load resistors. Last edited by DaveWM; 02-02-2010 at 11:53 AM. 
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