[zastin17]

The 21CYP22 looks nothing like a 21FBP. Not even close.
The phosphors are entirely different and are worlds better. It's akin to a 21axp far more than a 21FBP22.

Green phosphor is emerald green, red is like blood or a ruby, and the blue is a deep sky blue.

While the 22FBP22 on the other hand. Green is dark and "minty" and lacks a lot of range.
Red is orange in color and very poppy and "neon" making purples pop really agressiyla Nand faces a bit orange.

So no. The 21CYP22 is nothing lile the 21FBP and the phosphors look nothing alike

In my opinion the CYP22 is the gold standard from this time. It took the very best from the 21AXP and made a reliable glass tube. I have no idea why they got rid of these older early phosphors, but the color gamet is incredibly accurate and close fo real life compared to a 21FPB22. I have all three tubes here one from 1960, the other from 1965 and 1957. Virgin low hour ctc10, and Zenith 27KC20, and RCA Ctc5

I also have a CTC5 21AXP. The CYP is better than 21axp. Improved but the same basic formulation otherwise that can produce that amazing mustard yellow and accurate colors. Faces look correct and very lifelike. The color range and tone is just worlds better and the colors march my modern flatscreen Television. While the 21FBP sort of vears off into it's own.

The easiest way to tell is the vare face of the tube. The older phosphors are very ligjr grey almost white. While the later phosphors are olive in color. No this is not the glass in many cases. I do mean the bare CRT.

21FB22 is the worst for color I have seen in all roundies. I have not seen a 21FJP but I cant imagine its much better.