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The 6W4 tested OK but I replaced with a NOS 6AX4 anyway. Replaced the fuse too. That got HV back until I tweak the drive control when I got a flash and the fuse blew again. Still not sure exactly where the flash came from. Might have been the fuse itself.
Before it died I managed to test the HV and it was only 6.5 kV - should be closer to 11 kV. Something sure isn't right in that circuit.
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