I purchased the jca100h 2 weeks ago. When I play it at home there's no problem, but in my band's practice room, it starts to produce a bad distortion. I think it's a crossover ditorsion and probably caused by this old basement's electrical system where we play, voltage fluctations.. What can I do? Adjusting the bias (don't know the actual value but grid voltage is -52V) can solve the problem ? I' d insert an audio sample if I knew how to put it.
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