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RE: if I measure the voltage drop across the cathode bias...

thanks, Jim, that is the problem, no real schematic on this version, the current one online is I believe the V1 build. About the only thing I can guess is that the two resistors are in parallel, however if that is the case, then there is too much current passing thru the cathode to use even the recommended 5881! (1.15v across 37 ohms in parallel = 1.15/16 = .075 amps, 340v * .075 amps = 25.5 watts; someone else recommended no more than 40 ma thru the plate circuit...)


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