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Right, I have a bit more info..
The amp did squeal when I turned it on and let it warm up - the bias was pretty high. I adjusted the bias down and found that you can't get anywhere near the 15-20mA range where I'd like to set it. To stop the squealing I have it set at about 5mA!!!!
I think that low bias could be the cause of the next problem: There is a guitar signal but on loud notes (particularly bass) the note breaks up (not good distortion more like breaks into a crackle).
Also the tremolo does not appear to work... Oh boy, looks like a long week of troubleshooting!!
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