I have Scotch 201 (acetate base) and Scotch 206 (polyester base,
back coated) in two dozen alternating segments. The Scotch 206
is very sticky.
I was able to separate the 201 and 206 so that the 206 could be
baked apart from the 201 (not to be baked). The STUDER A820 has
only rolling contact when spooling, and I set the tensions very
low and the library winding speed at 3 meters/sec. This allowed
spooling of the sticky segments, which had to be done prior to
baking in order to separate the polyester from the acetate.
So here are my thoughts and questions:
1. For future playback, would it be better to splice all the
polyester together, each segment separated by leader, and the
leaders annotated as to the order of the segments? Ditto
for the acetate. Pros: Future baking becomes vastly simpler.
Downside: the non-sequential segment order needs to be
documented in the metadata, in the filenames of the preservation
masters, and possibly annotated on the tape itself (on the
segment separation leaders).
2. Or would it be better to re-assemble the reel in its
original segment order (alternating polyester/acetate)?
Pros: we preserve the original order of the tape. Cons:
someone in the future may have to repeat the exercise of
separating the segments yet again for baking?
3. I prefer to insert leader between the segments when there is
azimuth variation between the segments, as it allows for
easier identification of each segment and cueing each
segment for individual azimuth adjustment (thank goodness
for calibrated azimuth adjusters). Cons: you double the
amount of splices in the tape pack.
To date, I generally perform (2) above - especially if the polyester
segments do not require baking. I often get Scotch 201 and Scotch
176 in combination, and this is usually in good shape (ie. no baking
required). I perform (3) if there is variation in the azimuth between
polyester and acetate segments.
Just today I was wondering if (1) above would be a better approach
when dealing with sticky shed in a mixed polyester/acetate reel?
Odds are, anyone who will attempt to play such a sticky tape
in the future will have to go through the exact same exercise of
separating and baking. So why not leave things in a better state
for the next audio preservation engineer?
The Audio Archive, Inc.
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Disc and Tape Audio Transfer Services and Preservation Consulting