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Re: 1971 Super Lead 100 problems
If new tubes do not cure the motor-boating, check your coupling caps. Motor-boating is usually caused by too much bass frequencies. Also check your by-bass caps on the cathodes of the preamp tubes, especially the electrolytics, these can cause motor-boating. Another possible source of hum are the electrolytics in the bias circuit, I've run across that problem in vintage marshalls. If New tubes don't fix your problem, look at the caps next, the filter caps aren't the only ones that can cause problems after aging for 30 years.
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