Do you have cable TV in your system too? That can often cause a ground loop through the coax cable. Try getting some "cheater plugs", one for each three-prong plug in the system, and use them in various combinations. Always have at least one component (preferably the amp) grounded though, for safety. This worked for me before--I used a cheater on my preamp and left my amp grounded and that killed the hum. Good quality power conditioning may help a lot, too.
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