For transistor issues, do you think it would show the same balance related symptoms if it were one of the low level pairs vs the output?But it usually sounds like it somewhat continuously, if current is involved. I've never seen a bad 9470 transformer but there's always a first. I'd still lean more toward transistor problems, though what I've always experienced has been lack of low end, with the output stage being imbalanced. If the output was severely out of balance or running on one side for some time in the past, there might be a transformer problem. I'd metal film the shit out of that thing and F some carbon.
Yes. However is would be quite strange since transistors generally don't drift significantly. Unless they have been replaced?For transistor issues, do you think it would show the same balance related symptoms if it were one of the low level pairs vs the output?
Don't do that with a tube power amp, though...if it is an oscilation just use your fingers while listening the result. fingers change the capacitance between ground and schematics also change the resistance if you press them more. It is the best instrument for finding the oscilation point.
Are you talking about distortion that sounds like what I posted in the link?Remember that a drum has a very low frequency component that if you follow the distortion curve could very well be heard. If you look at the insides of the old 808 drum machine, they have this flapping sound that they add to the drum sound. That LF flapping, which is natural to a drum, can cause distortion that doesn't seem in sync with he tom tone.