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I have the same problem with my CTC5. The emission on the 21AXP22A is okay. Advancing the brightness affects grey scale. At lower brightness the greyscale is not bad.
The root problem may be the design of the final luma stage. Compared with the CTC7 upward, the anode current at the quiescent point of the CTC5 appears too high at cart cutoff. I earlier was investigating means reducing anode current quiescent point by shifting the CRT cutoff point.
I looked at this a couple of years ago and put it aside. Now that I know the problem isn't unique to my CTC5, I am going to revisit this. I would be curious if any of you have thoughts on this. I haven't substituted the 21AXP22A and am wondering despite the emission being okay that perhaps the guns aren't tracking properly?
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