I picked up a concept 2.0 receiver for 20 bucks. Lights function and all looked good. However, both tape inputs, fm section and phono section only give very quiet audio that is very distorted. I even hooked up directly to the main in to see if it was a preamo issue Same results going straight into the power section. So I think I've narrowed it down to a power section isssue, I'm just unsure what to try next to repair it. Any help would be great!