I have a mirage 300 w brick with a similar biasing scheme. It had terrible SSB
linearity until it "warmed up". I increased the forward bias so that it was
clean cold, but now it goes into a kind of thermal runaway when it gets hot
(draws 40 amps contiuously - class A!). My cure was just to put a really big
fan on it so it does not get hot. A less-than-ideal situation. A "real" bias
circuit would certainly help. I don't think any of the Mirage amps have them.
Ken
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