Quote:
Originally Posted by See_Mos
OK, it sounds as if it is going unstable and oscillating.
Turn the output level controls right down then scoping R112 and R212 then R106, R206 should show which stage is oscillating.
The common decoupling capacitor is C104 for the first stage and C300 on the power supply for the second but more likely is another bad connection at a cable screen or earth point.
Edit, just noticed that your circuit is completely different to the ones that I have. Can you scan the whole circuit and add it as a PDF?
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here is the complete manual ...
Dang its too big ....give me a couple mins