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Dear Shai,

3M 176 and 177 both can squeal, although your feline comparison is more
severe than what I ever experienced. When they were introduced in the 70s,
we put them into service in the news operations of the broadcaster I worked
for at the time and we noticed the squealing tendency then, so it is not a
consequence of age. Also *ab initio*, both tape types noticeably shed oxide
in use. However, those issues were not judged to cause any malfunction in
use and were in effect ignored. The formulation seems to have been one of
3M's most stable but it is years since I have handled any.

DDR

On Mon, Nov 23, 2020 at 6:03 AM Shai Drori <[log in to unmask]> wrote:

> Hi Tim
> They definitely do not need baking, they are dry and thus squealing.  I was
> under the impression that they were just a thinner 176. The 176 is a great
> tape in my experience.
>
> On Mon, 23 Nov 2020 at 11:33 Tim Gillett <[log in to unmask]>
> wrote:
>
> > Hi Shai,
> >
> > I have a stack of 3M  Pro Pack 177 (1 mil) n 10.5" reels. Not back
> > coated. Had them for about 40 years. All ex radio station log tapes.
> > Mostly they are OK but a little shedding so sometimes need more
> > cleaning of tape path than usual. Definitely nothing as bad as the
> > main SSS type tapes. I dont think I've ever baked any but have
> > thought they might need it if they ever got any worse.
> >
> > Cheers Tim
> >
> > ----- Original Message -----
> > From: "Association for Recorded Sound Discussion List"
> > <[log in to unmask]>
> > To:<[log in to unmask]>
> > Cc:
> > Sent:Mon, 23 Nov 2020 11:03:02 +0200
> > Subject:[ARSCLIST] Scotch AV177 sqealing
> >
> >  Does anyone have experience with this formulation? I always thought
> > it was
> >  the 1 mil version of the 176, but I have 3 tapes now that are
> >  squealing worse than cats in heat.
> >
> >  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
> [log in to unmask]
>


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