got a usher 1.5 200 watt per channel class a amp. no data on it anywhere. it's been passed around as a defective amp. It operates fine, then about 20 minutes later, the left channel cuts out. I'm the luck joe who figure out what was wrong with it....a few cold solders....I was able to pull a few bias resisters right out with little effort. So everything is all soldered up and the amp works fine. Remaining issues is to decide on a bias setting. Everyone who tried to fix it had their own ideas on what the bias should be. So for a 200 watt class A amp, what are recommendations. right now it's set to 50ma and the heat sinks are barely warm. The amp has 24 output transistors per channel and looks like it can fry some eggs. I have a pretty good AC line amp meter that can measure miliamps to 20amps. The amp at max power is supposed to draw 12 amps. Was thinking to adjust the bias until I get 80% of line draw or 9.6 amps. Unless there are other ideas. thanks for the input.