I have connected the 7700 to the line conditioner..no luck.
Your idea about checking the breakers I am doing today.
I have to say this is very trying.
Yesterday I noticed that when I used the 50' extension cord the hum was still there. Very low in volume but still there. It was so unnoticeable I had to put my ear to the basis of the 7700. This has me thinking that I wonder if the place I bought it to did not hear it. However I was there when it was running and I did not hear anything myself.
Thanks...I will be posting today's result later today or late morning. I have to get myself together before I start to look for anything.
A thought I have is I have an old Yamaha receiver. Only 100 watts. I wonder if I plug it into the outlet in my HT room if the HUM would be there? I don't know if that's the way to go.
I still have not heard from Scott but was talking to him yesterday and he wants to talk to one of their engineers who worked on the 7700. If nothing positive happens today I should hear from him by Monday , Tuesday.