RE: arsclist ADAT recovery

["list" <lists@xxxxxxxxxxxxx>]

Joav:

ADAT tapes can suffer from both dry shedding and binder hydrolysis (sticky
shed).  Baking, if done correctly, should not result in unrecoverable
tracking errors- it never has at our lab.  Of course, just like anything
else, baking must be done properly and not every tape should be baked the
same way.  Temperature levels, duration and ramping sequences must be
applied appropriately for the material being processed.

One of the problems with baking is that it is seen as a "one-size-fits-all
universal panacea".  Baking procedures that stabilize one tape formulation
may be totally inadequate for others while  higher temperatures safely
applied to one type of tape can seriously deform other tapes.  Some tapes
should never be baked.  ADATs can be safely baked but I would not recommend
it in some sort of the makeshift oven.  We use laboratory equipment that is
extremely adjustable and is stable to within 1/2 of a degree.  As a rule of
thumb, ADATs should be processed at a lower temperature and longer duration
than 2" or 1/4' audio tapes.

If someone is paranoid about the baking process, we also offer a service
that produces similar results using an environmental chamber but the
processing time can be measured in MONTHS.

Peter Brothers
CEO
SPECS BROS., LLC
peter@xxxxxxxxxxxxx
www.specsbros.com

Tape Restoration and Disaster Recovery Since 1983

> -----Original Message-----
> From: owner-ARSCLIST@xxxxxxxxxxxxxxxxx
> [mailto:owner-ARSCLIST@xxxxxxxxxxxxxxxxx]On Behalf Of Richard L. Hess
> Sent: Monday, November 25, 2002 12:43 PM
> To: ARSCLIST@xxxxxxxxxxxxxxxx
> Subject: Re: arsclist ADAT recovery
>
>
> Joav,
>
> If it's any help...
>
> I understand earlier U-Matic (3/4-inch) video tapes suffer from this and
> other loss-of-oxide decay scenarios.
>
> I've also seen messages from Jim Lindner that say that the dimensional
> shifts introduced by baking may (will?) cause unrecoverable
> tracking errors
> in the higher density video (and presumably) ADAT tapes.
>
> I haven't run across anything more than this. Hopefully Jim and
> others will
> respond.
>
> Cheers,
>
> Richard
>
>
> At 09:17 AM 11/24/2002 +0200, Joav Shdema wrote:
> >I am sure many of you have encountered problems with ADAT tapes over the
> >years just like we have. Recently I was sent a master recording
> of a French
> >artist of the early '70 which was transferred to ADAT some 12
> years ago (the
> >early blackface recorders). The tape now presents plenty
> dropouts and errors
> >and was sent to us because the record label gave up on it. They are now
> >looking for some Voodoo miracle to save their case.
> >It occurred tome that ADAT, Super VHS, tapes were made from material that
> >may have been another victim to the sticky shed problem. This Ampex S VHS
> >sure looks suspicious.
> >I was wondering if anybody on the list had similar experience
> and what was
> >the remedy?
> >
> >Best,
> >
> >Joav Shdema
> >Producer / Engineer
>
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-
For subscription instructions, see the ARSC home page
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Copyright of individual posting is owned by the author of the posting and
permission to re-transmit or publish a post must be secured
from the author of the post.