With some of my damaged tapes I get horizontal lines, anywhere from
1/4" to 2" thick, that slowly move down the screen.With some VCRs, like a Panasonic PV-V4521, those lines look like white static, but with others, like the last standalone Sanyo I could find, the lines are merely distortions in the picture. How did Sanyo do that? Both of these VCRs are hi-fi stereo and have
4- video heads.