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ampage archive
Vintage threads from the first ten years
1970 Marshall SL 1959
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 6/15/2000 9:42 PM |
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Dixieman |
1970 Marshall SL 1959 OK guys I appreciate all the responses to my original post - Thanks! Now that I've returned every thing to the original configuration, I've come across a major problem. After installing new pre & pwr amp tubes and biasing the tubes, this problem arose!!! With everything appearing normal and the amp plugged into a 1960 slant cab, anytime an input signal is applied I get what appears to be a line level signal out of the speakers and the power tubes glow bright orange!!!!! Has anyone seen the symptoms before????? What about fix!!!! Help!!!! |
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| 6/15/2000 10:28 PM |
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| Peter S |
Most likely the amp is oscillating at high frequency. This has the tubes blasting full bore but you get very low volume cuz all the power is sapped. It might make insect noises or squeal at high pitches too. Probaly a lead dress problem. Try moving some of the preamp leads around and see if it changes or makes any difference. Lead dress is critical in these amps. Peter S |
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