A CONSTANT streak anywhere on the screen could be a scratch in the tape itself. Losing sound, and ocassionally everything going to black and white, sounds like a dirty control track head.(The audio and control track are in the SAME head (a 3/4" metal cube that the videotape travels on). The control track section is on the upper part, and the audio on on the lower part.
If the control track head's dirty I'm sure the rotary head's dirty too! Losing audio and have tracking problems, point to dirt. And you MAY have SO much dirt built up on that head it's scatching your tapes (unrepairable), and causing you problems. Make sense?
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