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This Post Has Been Edited by the Author
In Reply to: RE: 6BG6G mono amp sounds great but posted by Blackdog on June 13, 2017 at 18:54:07
Thanks, I was wondering if that was the calculation. The spec is supposed to be 1.2V at cathode, which would be 1.2 divided by 25ohm = .048, about right.If I turn my bias adjust all the way to the other extreme, I had -26.6v on the grid, the cathode read .660v and the plate voltage plummets down to 294V. But cathode reading was moving in the right direction
Solved it mostly, by bypassing a dropping R in the pi filter which bumped up the B+ and now I can adjust for 1.2V at the OP tube cathode. I can raise B+ a bit further if I go from 5R4 to 5U4 rectifier.
Thanks to responders.Pete
Edits: 06/13/17Follow Ups: