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If you have played with the width linearity and centering already then add an HV rated pF cap across the damper tube, if not play with those controls first.
I'm not 100% sure on the wiring or value of that cap(There are threads on it though), but if you have a tube color TV with a jumper to increase or reduce width then the increase width cap circuit should be applicable to your set and may help.
Putting in REALLY strong testing HO and damper tubes can also help.
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