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RE: now I am really puzzled ......

I measured -2.2vdc with the negative probe on pin 4 (cathode) and the positive probe on pin 3 (grid) of the first 26. The variac was at full mains and the B+ was reading 283vdc at the terminal strip. That is where it should be reading close to 400vdc.



Edits: 04/27/16

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