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blackarab 7th March 2012 06:13 PM

Biasing Marshall 9200
help needed to bias amp using 5881/6l6 tubes ,need to know what proceedure to bias for new tubes ,many thanks Blackarab.

firechief 7th March 2012 06:54 PM

Ok so see here a short thread where a knowledgable onwer gives the specific numbers for bias current
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?

blackarab 10th March 2012 05:29 AM

biasing marshall 9200
thanks for your answer , i am getting 494v plate voltage and cathode current is -50v , how should i go about finding the correct current for the new tubes ,thanks for your help.

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