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#7
08-12-2009, 05:41 PM
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Yeah really, I'd love to have that tube, I need one bad. The 21AXP22 was first developed in 1955 and the first set to use it was the RCA 21CT55 using the CTC2B chassis. In 56 it was changed to the 21AXP22A due to small changes and is interchangeable with the first version. I have a 1957 Sylvania that originally used that tube but 56 was the year it was used most. The CTC 4 had a 21AXP22 and the 5 used the "A" version, the 7 used the 21CYP22. I think there was a different phosphor used in the later version of the 21AX.
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Last edited by zenithfan1; 08-12-2009 at 05:44 PM. 
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