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Hi;
I recall back in late 1964 our family bought our first color television. It was a Zenith roundie and I believe the chassis was a 25MC33. It was an exceptionally reliable set for the most part, but I do recall sometime during the first few months we had the TV the vertical did exactly as you described. It would roll vertically and then collapse to a horizontal line and then snap back to full screen with a verical roll. This cycle would happen quite fast! I also recall hearing it "snap" everytime the picture would shrink to the line and then pop back.
I remember how amazed I was when the repair man came to the house, tipped the set over on it's side, removed the access panel on the bottom, pulled out his meter, and within 10 minutes had clipped out a defective capacitor, soldered in a new one, put the bottom back on the set and was out the door. It worked great from that day onward. Lucky for us the set was still under the manufacturers warranty.
I hope your set has a similar fairly simple problem to diagnose and repair.
Good luck with it.
Bob.
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