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That was a real common problem with older TVs when VCRs became popular. Yes, the horizontal sync was more of an averaging circuit, so they didn't respond to variations due to tape tension, tape wear, and especially with tapes that were recorded on one machine and played on another. I remember Zenith had a modification for it, which involved changing some resistors and caps in the horizontal afc, but don't have any idea what it was anymore. Never had a time base corrector, didn't even know that such a thing existed, but I do know there were units to remove the copy guard (macrovision) that was encoded onto tapes. Maybe if you could get a hold of such a unit that might correct it. I remember showing a movie to some friends that dropped over with my "new" vcr and the bending made the movie look like crap.
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