It's not what I thought it was- looks like the tape "emulsion" is fine. The
looping only seems to happen
when the tape gets to the end and is ready to rewind. Listening to the tape, it sounds
almost like there's some slack
or slippage, but the cartridge seems tight when I look at it (take it apart, poke and
prod, etc. The tapes that I'm having
problems with (both trapped loops binding the tape and plain read errors) are noticeably
noisier than trouble-free
cartridges. I'm now wondering about streched band or lubrication issues (they have a
much duller surface
than newer DC600/DC6150s).