My SB-200 draws 90 mA of idling plate current, and both 572B plates show a
red color with no drive.
Is this red color OK, or should I increase the grid bias? (I think I should
have increased it when the tubes were new, but I procrastinated. :-)
When the Svetlana tubes were new a few years ago (when they apparently DID
come from Russia and not China), the idling current was 100 mA. I was
always going to increase the bias, but never did.
TIA,
Mike
www.w0btu.com
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