Phase inverter issue on express build

Express, Liverpool, Rocket, Dirty Little Monster, etc.

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MikeR670
Posts: 85
Joined: Sun Jul 10, 2016 7:56 pm
Location: B.C. Canada

Phase inverter issue on express build

Post by MikeR670 »

Is there a way to trace phase inverter voltages properly? I have b+3 into phase inverter circuit at 410 vdc. Then it splits and goes through the two resistors (one 100k and one 82k as per the schematic Kelly 90s), and onto the plates of phase inverter tube. But I read 171 volts pin 1 and 368 volts pin 6. Shouldn't they be almost identical voltages?
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jjman
Posts: 753
Joined: Sat Oct 06, 2007 2:33 pm
Location: Central NJ USA

Re: Phase inverter issue on express build

Post by jjman »

Is B3 supposed to be that high? Are the power tubes installed? Did you double check the plate resistor values with a good meter?
If it says "Vintage" on it, -it isn't.
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