Differences in 21FBP22 CRTs

[Tomcomm]

I'm running a 21FBP22 crt in my reactivated (not restored) RCA 21CT55. The matrix has been changed to the original CT-100 original I / Q chroma demodulation system from the 21CT55's R-Y / Q system. Color Bars reveal that the RED and BLUE are acceptable, but the GREEN is very much yellowish green. This causes YELLOW to be more brownish yellow.

I've got a second 21FBP22 that I think came out of my Dad's Zenith. It has a definite muddy green inactive phosphor tint where the present 21FBP22 is almost white or very slightly grey. I think its OK, but the neck pin cap is shattered and leans to one side so I can't slide the yoke and stuff over it. Maybe this CRT has better GREEN? Does anyone know anything about this CRT? I'd like to know more about this "greeni-roundi" before I go further...Tom