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Great find! My Dad's first color TV was a RCA CTC4 he won. I got it about 30 years ago and replaced the 21AXP22 with a 21FBP22 with sulfide phosphor, much brighter. I don't remember the inactive screen color, but suspect it was olive green like yours. the horz HV xformer burned out about 15 years ago and I trashed it, too bad.
Anyway, your 21FBP22 was replaced in 1970 so it should be plenty good. This CRT came out in May, 1961. By 1970, the 21FBP22A may have been rare-earth phosphor, brighter yet. Can you determine if your CRT is a 12FB22A?
I'm interested because I've got two 21FBP22s, a green screen like yours and a newer lite gray. The greeni is stamped 21FBP22 on it's pin-cap, along with its SN, the gray has only the SN which is much higher number. The gray seems to produce brighter, better color so I'm assuming it's a 21FBP22A. This is the CRT I'm using in my "reactivated" RCA 21CT55. I hope you respond so I can stop being concerned if I made the right choice of tubes. Thanks....Tom
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