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Originally Posted by tonyd
Thanks for suggestions. Yes, sub and amp on different outlets. Connected sub to Mr T and hum reduced considerably although still present and obtrusive when High Level control at 55 or higher. I'm not too keen to use a cheater plug, so might look at an isolating transformer.
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What else do you have plugged in to the preamp? Is the preamp in any way connected to a piece of equipment using the coax cable line (Cable box, etc???) The coax cable is grounded outside of your house (same place as your breaker box) and some times it can get some corrosion on it and will cause the ground loop. Try and disconnect one component at a time until the hum goes away. If this works I can talk you thru the rest....