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I could've sworn gassy tubes glow a bright purple, not blue due to the discharge of ionized oxygen. I have some tubes that glow blue on the neck glass due to electron bombardment. Is the tester responsive at all?
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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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