I highly doubt that.  There are a few thousand tapes there of different
makes and models.  Most are fine. We had the usual problem tapes like the
PR-150 but on the whole list of the tapes there and cassettes behave as
expected.

On Tue, 24 Nov 2020 at 14:42 Tim Gillett <[log in to unmask]>
wrote:

> Hi Shai,
>
> Given that there seems such a lack of  evidence for squealing on this
> 177 tape type I wonder if there is another factor at work. I know you
> said the tapes had been stored well but is it possible at some stage a
> substance contaminated them, perhaps something in the atmosphere in
> which they were stored. I know from Specs Bros that in disaster
> recovery where  certain residues are on the tape's surface, attempts
> are sometimes made to clean the residues off.  If there is a section
> of tape that is blank, the tape could  be suitably cleaned and dried,
> and then played to test for squealing. Working with a blank  tape
> sample would mean there is no program at risk and possibly a
> solution  to the squealing problem found.
>
> Cheers Tim.
>
> ----- Original Message -----
> From: "Association for Recorded Sound Discussion List"
> <[log in to unmask]>
> To:<[log in to unmask]>
> Cc:
> Sent:Tue, 24 Nov 2020 08:32:45 +0200
> Subject:Re: [ARSCLIST] Scotch AV177 sqealing
>
>  I should note that in the 43 years of dealing with 176 I have never
> had one
>  squeal. I’m surprised to learn that some batches squeal. Luckily
> they
>  haven’t made it to Israel.
>
>  One last note, the 3 reels of 177 that squeal have been stored in a
> proper
>  vault.
>  Cheers
>  Shai
>
>  On Mon, 23 Nov 2020 at 23:08 Richard L. Hess
> <[log in to unmask]>
>  wrote:
>
>  > Hi, Corey,
>  >
>  > Thanks for the concern over my time...I do have other things to do,
> but,
>  > for now, I seem to be the only one doing this.
>  >
>  > In fact, I just updated this page based on Dennis's comment and
> wove it
>  > in with a larger analysis of the 3M spreadsheet of tape types. The
>  > 3M175+ and 3M 176+ sections under Soft Binder Syndrome have been
>  > updated, Note that 201+ also appears in the light edge shedding
> section.
>  >
>  > <
>  >
>
> https://richardhess.com/notes/formats/magnetic-media/magnetic-tapes/analog-audio/degrading-tapes/
>  > >
>  >
>  > There was a good deal of energy generated for just such a database
>  > following the AES Archiving conference at the Library of Congress
> in
>  > Culpeper, VA, in 2018.
>  >
>  > Following that, some people who said they'd share datasets did not
> do so
>  > with no explanation.
>  >
>  > Also, Dr. Federica Bressan and I spent hours discussing this issue
> and
>  > have come to the conclusion that not enough accurate raw data are
>  > available at this point to legitimately construct such a database.
>  >
>  > We have ample anecdotal evidence of significant batch variations in
> many
>  > manufacturers' tapes. Since the vast majority of recordings do not
> have
>  > the tape batch number recorded with it, many do not have traceable
>  > documentation of the published tape type, the tape type may have
> changed
>  > over time,(one U-Matic tape type had four different FTIR signatures
> over
>  > time and there we're pretty certain that the type number is on the
>  > cassette (Benoit Thiebaut, Prestospace Project c. 2006)), and there
> is
>  > usually little to no record of the storage conditions for the tape.
>  >
>  > So, it is very difficult, if not impossible, to make an accurate
>  > database that goes beyond the type of general narrative that I've
> been
>  > providing. While I think we'd all love to have a database that
> says,
>  > "Use this technique to remediate tape type X."
>  >
>  > Rather than a documentation approach, I have been pushing for a
>  > "pool-test-kit" type of system where applying drops of something or
>  > other to a small sample of the tape would suggest what to do.
>  >
>  > Andrew Davis of the Library of Congress has suggested a water
> droplet
>  > test which I have tried and found cumbersome, slow, and subject to
>  > interpretation...and this was only to say, "does the tape need
> baking."
>  > It seemed promising until I tried it, but maybe he's onto
> something.
>  >
>  > I would be curious if anyone has any further ideas on this, I don't
> want
>  > to throw a bucket of ice water on the idea, but it is fraught with
>  > difficulties.
>  >
>  > Thanks!
>  >
>  > Cheers,
>  >
>  > Richard
>  >
>  >
>  >
>  > On 2020-11-23 1:06 p.m., Corey Bailey wrote:
>  > > As Dennis Rooney pointed out: "3M 176 and 177 both can squeal."
>  > >
>  > > Shai's post points out the need for a centralized database
> because this
>  > > list is sprinkled with a wealth of valuable information on many
> subjects.
>  > >
>  > > Richard Hess maintains a page on audio tape known to have
> problems but
>  > > he should not have to keep up a centralized database (He has
> other
>  > > things to do, I'm sure).
>  > >
>  > > Anyone know of some good email mining software?
>  > >
>  > > My $0.02,
>  > >
>  > > CB
>  > >
>  >
>  > --
>  > Richard L. Hess email: [log in to unmask]
>  > Aurora, Ontario, Canada 647 479 2800
>  > http://www.richardhess.com/tape/contact.htm
>  > Track Format - Speed - Equalization - Azimuth - Noise Reduction
>  > Quality tape transfers -- even from hard-to-play tapes.
>  >
>  --
>
>  Cheers
>  Shai Drori
>  Expert digitization services for Audio Video
>  3K scanning for film 8mm-35mm
>  Timeless Recordings Music Label
>  www.audiovideofilm.com
>  [log in to unmask]
>
> -------------------------
> Email sent using Optus Webmail
>
-- 

Cheers
Shai Drori
Expert digitization services for Audio Video
3K scanning for film 8mm-35mm
Timeless Recordings Music Label
www.audiovideofilm.com
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