Hi, Argent. Last year, I also had a HTS3500 in my system, and it also hummed. Not so much than it was audible during normal listening, but my wife noticed it when she listened to the system at lower volumes. I eventually determined that the cause was either: the transformer in the HTS3500 hummed, or there was a ground loop problem. Given that your 3500 hums, and changes pitch and intensity when the lighting rheostat is changed, the cause is most likely a ground loop. (BTW, I also have a Bryston 4B-ST in my system.) Lighting rheostats can be a notorious problem in some systems. I don't know if you have a cable TV hookup as part of your system, but if so you should start there with a ground loop isolator (available from Radio Shack or your cable company). If none of the "normal" solutions work to get rid of the hum, you might try switching out the HTS3500 and substitute a HTS2000 (which is what I eventually did). Yes, I know you lose the nice power meter on the front, and the sequential turnon and turnoff for your components.
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