Quote:
Originally Posted by robert1
Ok, have you tried to remove the leads on pin 2 of the 6SQ7?
the only things i can think of is there is a filament to cathode leakage on ether of the 6SQ7 or the audio output tube, or high ripple on ether the B+ or B++ sources. it also could be originating at the volume control itself (broken ground connection).
if you had a scope, you could trace the audio signal path to the point where the AC ripple is coming from.
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Ok clipped all on pin 2 of the 6sq7 and still got the hum, so I guess it's off to the b+ or b++ . Ground at the volume is intact.