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Is this gas?
Found this while testing the 21amp4 on my newly acquired Rca 21d641. I firmly believe it is just electron bombardment on the glass due to the fact that it moves on the glass when switched from cutoff to emission test. And to add to that the cutoff isn't acting weird and isn't off the charts high. Maybe only 1/4 scale at the most. The tube tests great after cooking for an hour and this glow only appears in one place, but I just noticed this and need some other input to confirm my theory. I do believe it is not gas but electron bombardment on the glass. First picture is testing on cutoff and second is on emission and the results.
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Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
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