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Hey, if the 6BK4 HV regulator wasn't working, then when the TV was powered on for the demo there would be no regulator and no CRT HV current (CRT still warming up...it's weak) and so there would be no load at all on the HV. Could HV levels rise quite high under such conditions, high enough to cause a bang-type arc perhaps around the metal CRT, right before the CRT came up? If so, that might explain why I can find no component that appears to have ruptured or burned. Anybody know how much HV can be generated by a CTC-5 with no CRT load and no shunt regulator load? Maybe my 6BK4 is dead, or else coming up much slower than the H-OSC, HOT and HV regulator. Sound possible?
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