OK, so I'm starting to go through old 2-tracks to archive old formats. It appears that all of my old Sony, TDK and Maxell DAT tapes are still fine. However, about 25 of my Ampex DAT tapes just won't track, and constantly have audible problems. Am I just out of luck, and have to go back and re-mix these old multi-track masters? Any advice here?

Machine is a recently serviced & cleaned Panasonic 3700, I do have one or two Sony consumer decks (DTC-690 from memory, could be way off) in boxes, but since it's consistently a tape brand issue I'm not too optimistic.

Thanks in advance,

je