12-21-2012, 02:02 PM
If it is indeed 60 Hz hum, it most likely isn't the power supply area...that would have 120 Hz ripple if it derives from a full-wave rectifier.
60 Hz stuff usually comes from filament circuitry, or an external ground loop.
Dennis
60 Hz stuff usually comes from filament circuitry, or an external ground loop.
Dennis
Pacing the cage...