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In Reply to: RE: What the hell could explain this? posted by Rick W on March 14, 2015 at 13:58:54
A hum can be a transformer if it's heard at the amp and not the speakers. A transformer's core lamination can extend and contract twice during a normal voltage or current cycle. This means that the transformer is vibrating at twice the frequency of the supply, i.e. for 60 cycles per second supply frequency, the noise or vibration is moving at 120 cycles per second. With older equipment that can begin to happen if the core lamination has begun to dry out on the transformer.
Edits: 03/14/15Follow Ups:
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If it's at the speakers it's electrical most likely a ground issue. If you haven't already done it try lifting the ground. It might not be the amp you may have to try lifting the ground on the preamp or one of the source components.
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