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I never have messed much with mine....I am guessing that cap mounted on the SIDE of the chassis is the one you are talking about. If you can cut the volume totally and do NOT get hum...then it is NOT coming from the power supply I beleive.
Try and ground the phono chassis to the amp chassis--make SURE the ground connection is good between them. This should cut down on hum. Also--make sure all connections to the pickup are clean and secure and have continuity through them too.
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