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Any plug-in modules on the chassis? I had an RCA CTC-74 (?) that would lose vertical sync until I moved the set even a fraction of an inch, and would never act up on the bench. I finally resoldered the entire module and the main chassis PCB and the grounds around the sync circuits.
May not be a 74. It was an XL-100 console with the SCR horizontal output.
Anyway, it never acted up again. I sold it, and about a year ago, I got to see that it was still running perfectly... although somewhat purple-ish due to a weak CRT... after only 15 years!!
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