2:90 2:Ninety Bias mod?

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francm

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Has anyone done this? I'd like to be able to adjust the bias in my 2:90 so I can try different tubes.

It looks like 2 of the tubes running at the -57 bias voltage are the ones I want to play around with since they are the Class AB pair while the other two are the class A power tubes with cathode bias. That make sense?
 
I'm actually working on this. I'm trying to figure out how to bias the class A section separately from the Class AB section.
 

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