I did some reading up on the A version of the 21axp22. The red dag coating was used to prevent internal arcing in the neck of the tube. Does this imply that the original 21ax had arcing issues inside the neck? We're the phosphors on the A version improved over the original?
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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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