It’s not entirely clear why [Advanced Tinkering] needs a 50,000-volt power supply, but given the amount ... To ensure everything stays safe in the high-voltage stage, he took the precaution ...
[GK] spends most of the time so far talking about the high voltage power supply design. For the particular tubes he had on hand he needed +200V, -400V, -550V, and 6.3VAC for the CRT heater.
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Quad output HVPS A Single High Voltage Power Supply/X-ray Generator Able to Drive Four (4) Independent 160kV, 5kW x-ray Tubes OXFORD ...