An experiment that may help narrow things down - Try recording something on some "new" tape. Spool some tape from a blank VHS tape onto an empty reel. If you don't have any empty reels splice together a continous loop.
If the transport runs smoothly with the "new" tape your old tapes are binding. There are various ways to clean/treat the tape prior to playing.
Being a B&W machine it may not play nice with color video (even if it is working properly) - I'd use the Y signal (green jack) from a DVD player (just be sure its set to NTSC/480i).
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