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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...

A lot of people want to do this mod on their 20/20 but info can be hard to find. Basically, the deep mod consists in removing the high pass filtering on the input stage on the 20/20 amplifier. Its is very simple. All you need to do is remove the C1/C3 capacitors on the tube board. The image...

Any recommendations on a good solid rhythm tone that would be real close to the Black album by Metallica? I'm close but still not quite there. :twisted: