For high voltage power supply, I was planning to use 230V to 110V AC transformer and rectify it. So, the DC voltage would be 155.6V, I hope. Here is a nice article regarding in-9 driver that has +150V as high voltage power supply. So, I believe that I can use the same circuit and test all in-9 tubes i got? I'm worried about cathode poisoning and other issues that are common with these tubes.
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