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Re: Horrible Hum Problem - Heathkit W4 Rebuild

Posted by steven oda on November 8, 2002 at 20:30:54:
Jackson,
I'd trying pulling each driver tube one-by-one, from the first gain stage through to the phase inverter---of the humming amp. Best to try and isolate the section or tube which is causing the most noise.
Could be bad ground and/or tube. Be nice to have some spare tubes which you know work well (like in the good amp) to do "A/B" comparisons.