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No, I have tried to isolate the stereo as best as possible from any other device such as fans etc etc. The tv is not hooked up to the receiver at all. I use the tv as a monitor only which is hooked up via component direct from the dvd player. I also have turned all devices i could find such as ceiling fans etc etc. We installed a 3 prong grounded outlet commercial grade and rand the cable directly to its own fuse within the panel. It has become quite enigmatic and rather frustrating. Oh, I also turned of all other components suchg as cd player, dvd etc etc and it was still there. So basicaly the problem persists even with only the receiver on. The hum can be heard in all speakers. This is what led me to believe it was a ground but I dont know how to improve what seems to be a good ground etc.
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