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maybe its just blooming? seen this when brighness not setup right (CRT bias/G2 screen settings). mostly I see this on my zeniths, if you setup wrong and then have a sudden bright scene change the screen will partialy bloom, go a bit out of focus, then kind of recover.
you could try reseting the entire grey scale and see if that helps.
oh and if you have one, sub in a new video out tube, if its acting up it can mess up the bias of the CRT cathode voltage.
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