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I believe most if not all Zenith roundies had a dual section 3 lead disc capacitor in the vertical circuit. When it would start to go, you could have all kinds of goofy vertical problems. If it were flat out bad the vertical would pull up from the bottom. As I recall, hitting it with circuit freeze sometimes worked when there were weird symptoms.
If the set came in with a vert problem that was the first thing suspected, and many times the problem. I replaced a lot them as preventive maintenance.
Good luck.
Phil
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