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I would adjust for correct linearity and look for the problem in the vertical sweep circuit. Probably a bad cap. Check B+ in the vert circuit as well. You just do not have enough vertical sweep. This will also effect convergence.
With their age the Selenium rectifiers on the convergance board should probably be replaced. I don't recall changing many in the day, but they are much older now. I think those are more reliable than ones used in the power supply. I would change them. If for no other reason to make the set more reliable.
Bill R
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