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arsclist A Concern: Ampex 611 tape
I wanted to pass on a concern that I discovered.
I have been restoring tapes from the mid-60s through the 70s under a grant
program and came across a group of three Ampex 611 acetate tapes. These had
a mild vinegar odor and showed some substantial spoking--not like the circa
1943 tape on my Web site (the scalloped one) but enough that I've had to
wind it a few times to try and get it to play a bit better. Two of the
three reels in this group of 611 is showing the problem.
While some of it could be the wind, the 3M 111 of the same era in the same
collection has been doing much better and appears to have been treated to
the same loose Wollensak-type wind.
I'm only mentioning this because if you have some Ampex 611 in your
archives, you might want to check it out for deterioration and transfer it
before it becomes significantly degraded.
I'm not implying that all 611 stored under all conditions will be
problematic, but I thought sharing this particular problem might be of some
interest. I don't know how old the tape was when it was recorded on. The
recording dates from 1965. The tape could be older.
Oh, and it's 3.75 ins (fortunately full-track) so it is far more sensitive
to the variations and warpage than the older, 30in/s tape pictured on my
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