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as long as you can get the cut off in the range you are good to go, regardless of the setting. Sounds like your CRT is fine, I would not recommend any more rejuv attempts to make anything better.
As others have said, a CRT can test very poorly and still produce a watchable pic, no doubt less than perfect, but there are a lot of adjustments that can be set to make a otherwise weak tube look ok.
case in point, a zenith I picked up some time ago, it had a tube brightner on it which I removed, the red gun is weak. However after a few minutes the red picks up so its important to let things warm up before any adjustments.
Second adj drives and screens you can compensate to some degree for diff in guns, tracking may not be great but if you are not fiddling with the brighness then it really does not mater, set it up for a low light level and leave it there. Dont for get to set the focus, again it is optimized for the brightness setting.
bottom line is if one gun is weak It can look ok, not great but ok. But it sounds like your CRT is not bad.
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