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The skills part I'm confident in, it's the knowing what I'm doing part that gets me. There's one resistor on the exposed side of the board by the bias pot. I figured it might be a simple thing for someone to help me figure out which resistor I needed to put there to accomplish my goal. I can...

I've got a Screamer 50. I'm trying to bias new tubes (JJ6L6GC), but I can't get it higher than 22mA. The math for 70% at 440V says I should shoot for 47.7mA. When I contacted ENGL, they said between 28-35mA. It sounds like the theory here may be that cold biasing is part of the ENGL sound. I'm...