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I remember the "flag-waving" problem affecting Zenith color TV sets more than anyone else's, to the point that they designed and sold an entire replacement module for a big group of their sets. Slower-speed and/or "borrowed/rented" tapes were always most likely to cause the problem.
From my first B1-only machine in fall 1979, no Beta VCR I ever had/used did not have some horizontal instability (what "flag waving" actually is, but on a much smaller level here) at the head-switching point near the bottom of the video frame on all machines, so I do not know what any specific design might have been to keep that from affecting slow-response TV sets to the point of visibility past the vertical sync (and thus, "flag waving"). I never had a VHS machine in those days to compare the head-switch video stability.
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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