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The only concern with the high voltage cup would be if it arced - no effect on picture otherwise.
The pattern looks vertically compressed near the very top. You can try adjusting the vertical linearity to see if it can be improved without bad results elsewhere. A DVD with an Indianhead test pattern might be helpful at this point.
Sometimes when the linearity is best over-all, it may be a bit out at the extreme top. This is the case for my RCA CTC-5. I don't know what could fix it, so I just use the best compromise setting. Maybe fresh tubes in the vertical section?
Anyone else have a idea what could be done to get closer to perfect?
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