I might add the power supply was cooked when it came in. Repaired that and the amp works great, just has the annoying chirping noise at the ouput inductor.
I tried but this model has the inductor mounted on a black square piece of plastic up off of the board. Like the power supply toroid. I will try again. The wires are difficult to move.
There is 55mv on the output terminals, and a slight bit of oscillation. It makes my reference line a tad hazy. The amp works fine. The noise might become irritating for someone that mounted the amplifier inside the cab of a truck or car.