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Re: Bandrecordertape vraagje?

Geschreven door Rob Hooft op 07. Sep 2004 00:12:58:

In reactie op: Bandrecordertape vraagje? geschreven door Rob Hooft op 06. Sep 2004 21:18:39:

Kennen jullie dit?

Hello Webmaster!

Recently one of my clients asked me to remix some songs, recorded 6 years
ago on Ampex 456 1"-tape. She had stored the tape under bad conditions. It
showed some white kind of "rash" and smelled rather musty. When trying to
wind and rewind the tape at library speed soon my recorder (Fostex G24)
grinded to a halt.
There was a very sticky brown deposit on the whole tapepath (rollers,
tension arms and the like). The rash came off in little flakes, not
dissimilar to dandruff :-(
Could you please give me some advice on how to restore this tape?
Many thanks in advance!

sincerely yours,

Frits van Mourik
Geluidsstudio Het Pand,Vlaardingen
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To: "'Frits van Mourik'"

The problem you describe sounds like a case of binder hydrolysis.
Fortunately, mechanical operation can be restored by "baking" each
affected reel. Many people successfully treat "sticky shed syndrome" with
the following simple and effective process.
The tape should be baked in a convection oven (not microwave) at a
temperature of 120-130 degrees Fahrenheit (= 50º Celcius) with ambient
humidity. Do not exceed the temperature specification or the tensile
property of the sample can be compromised. A 1" audio tape of 2500'
should be baked for 16 hours. The size of your oven is the only
limitation as to the number of samples that can be processed at one time.
However, some separation between reels is desirable to allow even
distribution of the heat; the ideal arrangement is a vertical or upright
position with an inch or two of space between. If the initial
conditioning does not sufficiently restore the mechanical operation of the
tape, repeat the baking process in 4 hour intervals until successful. Do
not adjust the temperature; only adjust the baking time. After the tape
is removed and acclimated to room temperature, cycle it one pass (FF and
REW) on the recorder. It is also wise to clean the tape path before and
after the initial pass to rem!
ove any deposits generated by remnant surface debris. This treatment
usually repairs the tape for an interval of 3-6 months, but the "sticky
shed" symptoms will thereafter return.


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