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RE: [AV Media Matters] Tape baking


The Eastman Audio Archive has a section of Ampex 456 tape from the
'80s.  To date we have not encountered the leader problem you speak
of, but we generally bake our tapes only 4 to 6 hours. I have thought
about the possibility of leader tape being affected by the baking, but
have not heard of it to date. Also, we have a lot of paper leader (that
we are replacing) so perhaps we have been fortunate. And the fan in our
oven is particularly good.  Please do post the responses.

At 04:32 PM 1/27/2001 -0800, you wrote:

>Greetings from a lurker!
>I have for a couple of months been employed at
>DCM, a CD plant in Sweden, to digitize an archive of reel to reel tapes.
>Our mission has been to start with tapes from the early 1980's, for known
>reasons. We have also had to bake quite a few of those tapes, and that
>has worked out well. Recently, however we've encountered a phenomenon I
>haven't heard about before: sticky leader tapes. That wouldn't be so bad
>if not the magnetic layer adjacent to it also stuck to the leader. The
>effect of it is quite stunning - enormous tape echo for one turn of tape,
>coming from the deposited layer on the leader tape, then somewhat quieter
>regular sound.
>The tapes concerned are mostly Scotch 226, and
>some Ampex 456, from 1980 to 1985, possibly manufactured earlier, and
>they have been baked for about 8 hours at 50 deg C. Also the tapes
>"behave sticky", i.e. unwinds at an angle, but don't leave any
>deposits. Have anyone out there seen this before, and maybe have a
>remedy? Could the baking have affected the leader tapes
>Tommy Sjöberg
>Sound Engineer
>+46 8 477 20 22
>DCM Sweden AB

Esther Gillie, Sound Recording
Phone: 716-274-1330
Eastman Audio Archive
Fax: 716-274-1088
Eastman School of Music,  Sibley Music
Library  esth@mail.rochester.edu
27 Gibbs Street, Rochester, NY 14604

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