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It's been a while since I messed with my CTC5, but I remember getting about 23-25 KV with a dark screen, and about 19-20 KV before the HV would fall off a cliff and go low enough to lose focus and brightness. This was with stock circuitry and using tube focus and HV rectifiers. Might as well remove the 6BK4 since all it seems to do is set an upper HV limit with zero beam current. I haven't tried solid state diodes myself yet.
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Erich Loepke
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