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In a darkened room, I looked up into the 1B3GT and saw the ruddy orange glow of the filament. Also there was a ring of blue haze just below the top metal piece that's inside.
I have a bunch or other 1B3GT tubes and I tried at least 4 to 6 others. They all had the ruddy glow and the blue hazy ring.
Because I can draw a 1/4 inch purple arc off the top of the 1B3GT tube, does that mean I have good HV? I'm thinking so or we would be looking elsewhere.
Again, thanks for all your help.
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