I have an *old* top-loader, beta format VCR I am trying to resuscitate. Everything works, but when I play storebought movies, I get audio wow and flutter, and snow across the screen about once each second. When I play back tapes I recorded long ago at the machine's slowest speed, the flutter and snow occur less frequently.
I've replaced the idler and belt, and the pinch roller. I've lubricated everything, and cleaned the tape path and heads. I did receive a suggestion that the problem could be the capstan motor. I hope not, as I don't know where I'd find such a part for a 23-year old VCR.
Any suggestions as to diagnosis, or leads on parts would be appreciated. The model number is VCR-3900II.