Ok, I will try to keep this short and to the point. I recently bought a Bryston 3B-ST amp and hooked it up via the preouts on my Denon 3802. As expected, the mains started to hum. Alright, I smugly thought, I've read the posts here, it is probably a ground loop potential problem between the cable and house ground. I disconnected the cable and, voila, the hum disappeared. As I do not believe in cheater plugs, I decided to tie the two grounds together to relieve the ground loop. We have one cable coming into the house and I have it connected to a 1 into 4 booster box I bought at the Home Depot. One goes to our TV upstairs, another to the VCR upstairs, another to the TV downstairs, and the final one into the back of the Denon for FM reception - all short (less than 10 foot runs). There is a ground block on the RG-6 cable coming into the house in which the ground wire was attached to our hydro meter. I disconnected that and ran the wire directly to one of the ground screws in our beaker box. As you guys can guess, I am writing this because when I turned everything back on, that hum was still there What gives! Also, I checked to see if the outlet was grounded. It is. Any suggestions are appreciated. I do currently have the 75-300-300-75 ohm transformers hooked up as suggested on this forum. That does get rid of the hum, but I want to solve this riddle.