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Biasing Marshall 9200
Biasing Marshall 9200
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Old 7th March 2012, 05:13 PM   #1
blackarab is offline blackarab  United Kingdom
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Default 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.
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Old 7th March 2012, 05:54 PM   #2
firechief is offline firechief  United States
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Ok so see here a short thread where a knowledgable onwer gives the specific numbers for bias current http://www.diyaudio.com/forums/instr...ll-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?
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Old 10th March 2012, 04:29 AM   #3
blackarab is offline blackarab  United Kingdom
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Default 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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