In Reply to: Re: Speaker still hums with amp shut down: cause? cure? posted by Bruce from DC on March 23, 2004 at 09:26:44:
with the amp powered down all night (to let the PS caps fully discharge), it's still there.Somehow, the speaker cable is picking up powerline hum. (When you turn lights on and off, the hum changes.) The cable passes fairly close to a large cast-iron radiator (not it's not electrically "hot"). Re-arranging the position of the cable slightly eliminated the hum.
weird.
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