TX-SR705 60 hz. Hum
If you have a Home Theater Line conditioner on this receiver, not a power surge protector, even a "Monster" surge suppressor, your problem Is AC related. For troubleshooting; first if your AC power cord is three pronged, go to Lowes, Home Depot, etc. and get a three prong to two prong adapter. Your problem is a "Ground" issue, however it may not be from the receiver, it could be "Anything else" in your home. Even an actual outlet with a loose wire. It can be very very time consuming to "hunt down". An adapter will take the rest of the house out of the picture. Disconnect all other input sources like Cable, DVD, etc. then turn the unit back on. If you still have a humm, yes the problem is internal and needs serviced. If it stops, re-connect one item at a time until the noise re-appears and you have your culpret. If you don't have a line conditioning noise eliminating Theater surge protection unit; Get one! best few hundred bucks you could ever spend. It will protect all your electronics and could save you thousands! Panamax, Furman, Monster, are your top 3. If you still have issues, post a comment and I can help you further. Hope this helps.
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