Sometimes the hum is caused by "DC Offset". The AC power quality is off a little, and the transformer has to work harder to get the right power to the amplifier or other component. It will vibrate more when it has to work harder. A power regenerator/ voltage corrector would probably fix this kind of hum. (PS Audio, Equi=tech, etc.) Sometimes Stehno's solutions will work as well, as well as a dedicated line, if the power problem is in your house and not the local utility.
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