Thanks for your follow-up. I took the top off, and played with input board a little. The ground was broke in the board so I took it to a B&K dealer, I should get it back today.
Problem with inputs
I just got a B&K AV2500 Series 1 amp to play with. Of course it was used. The input jacks on the back are lose and I'm getting a terrible squelch through my speakers. Every once in a while I can get it to work but not often. I thought it was a ground in my cables but I switched them out and gently flicked my cables and it squelched again. So it has to be the inputs that are loose. I tired to tighten them but the screw is stripped and it will only tight just a bit. Is there anyway I can fix this? Because the inputs are loose did the ground break? Any feedback would be great