I just had an idea. I improved my 7JP4 with the grid-cathode short remover
of my Sencore. Maybe my 15GP22 arcs are not caused by gas ... I never saw
a purple glow. I'm going to try that short remover on every single pair of
electrodes in the gun, including ones between different guns (excluding
heater-cathode). It can't hurt. I'll first check it with a 2kV supply set to
current limit at say 50uA. That should catch gas.
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