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Thanks pug100.
I've tried the tapes on 2 machines, including a brand new one. A lot of my other tapes play OK on both.
All my tapes had been stored in the basement, & it's maybe a bit damp down there. They've been upstairs in the warm & dry now for weeks, but no apparent improvement. Some of the films are available on DVD, guess I'll have to lash out eventually. The rest I'll do the best I can with. Better a dodgy copy than none at all !
I intend to scrap the VHS set up as soon as I've done the copies.
Thks again for your comments.