Originally posted by bobloblaws
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If you connect any of your (grounded) test equipment to the speaker (-) lug, you short out that feedback element and can cause all kinds of test induced weirdness. So you need a fully floating load or speaker, and your test equipment grounded to chassis.
Not saying it has anything to do with the problem, but may lead you to look for other ghost problems that are test induced. (possibly items like in post #12)
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