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I'm updating this in case anyone stumbles across this thread in a search. This machine has/had two problems: First, the control/audio head assembly was out of alignment causing the machine to act like a tracking control that didn't have enough range. Second problem is the capstan and pinch roller, the capstan has a visible wear pattern where the tape rides and it is causing wrinkling of the tape as it exits the capstan. This is causing distortion of the FM waveform picked up by the video head and it occurs at the same rate as the disturbances seen on the TV. I'm sure the solution is to find a good capstan without the wear in the center and get the tape deformation to stop.
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Erich Loepke
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