Ok so see here a short thread where a knowledgable onwer gives the specific numbers for bias current http://www.diyaudio.com/forums/instruments-amps/202010-marshall-9200-a.html
I asume that there are resistors in the cathodes of the output tubes, if so measure the voltage drop accross the resistors at idle and adjust?
I asume that there are resistors in the cathodes of the output tubes, if so measure the voltage drop accross the resistors at idle and adjust?
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