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The 405 volt supply is built and tested. It was applied to the set
and immediately showed that R210, the 1000 resistor that feeds the
gas regulator tubes, was open, These are still available.
I was able to temporarily replace it with 200 ohm resistors in series.
This showed that at least most of the B+ chain is working OK.
Next up is the -50 volt supply, the noise filter for the 28 volt supply,
and the power cable.
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