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All of the Shamrock 041 stock that I have encountered is acetate tape,
never bake it!  My understanding is that it was very low end stock.

Cheers
Marie

On Wed, Aug 15, 2012 at 5:49 PM, Michael Biel <[log in to unmask]> wrote:

> Shamrock 041 was not one consistent type of tape.  It could be light
> brown, dark brown, or black oxide, either carbon backcoated,
> non-backcoated, or even graphite lubricated backcoated of a type used in
> continuous-loop cartridges.  So the reasons for the problems can be
> quite different.  This was usually higher-grade tape that was rejected
> for some reason, and as Dennis mentioned, slitting can be a reason.  A
> splice about 300 feet in can be another reason -- and the fact that it
> was not a splice-free reel sometimes means that there might not be any
> other defect to the slitting, oxide, or base.  So baking might not be
> the solution.
>
> Mike Biel  [log in to unmask]
>
>
>
> -------- Original Message --------
> Subject: Re: [ARSCLIST] Treemonisha 1972 at Carbondale squeaks
> From: Dennis Rooney <[log in to unmask]>
> Date: Tue, August 14, 2012 10:58 am
> To: [log in to unmask]
>
> Dear Rainer,
>
> Shamrock tape from that period is almost certainly not subject to binder
> hydrolysis; however, the squealing or squeaking (both appropriate) you
> are
> experiencing may be due to mis-slittling. Shamrock always sheds oxide,
> so
> stopping at intervals to clean it should be the only interruption to
> making
> ana/d transfer into a digital editor and then stringing it together the
> transfer. One man's opinion, anyway. Good luck,
>
> Ciao,
>
> DDR
>
> On Tue, Aug 14, 2012 at 4:05 AM, Dr Rainer E. Lotz
> <[log in to unmask]>wrote:
>
> > I have on quarter-track tape a stereo recording of the Marjorie Lawrence
> > Opera Theater production of Scott Joplin's opera "Treemonisha", Shryrock
> > Auditorium, Southern Illinois University at Carbondale, 17-18 November
> 1972.
> > Unfortunately it is a Shamrock 1 MIL polyester 1/4 IN x 1800 FT type 041
> -
> > it squeaks and squeals (or whatever the appropriate word in English is).
> > I was given to understand that such tapes could be rescued by "baking" or
> > some other remedy, but I would not know how to do that.
> >
> > *Is there a better copy around somewhere...to replace mine. Perhaps on
> CD?*
> >
> > Thanks
> > Rainer
> >
> >
> >
> > --
> > Dr. Rainer E. Lotz
> > Rotdornweg 81
> > 53177 Bonn (Germany)
> >
> > Tel: 0049-228-352808
> > Fax: 0049-228-365142
> > Web: www.lotz-verlag.de
> >
>
>
>
> --
> Dennis D. Rooney
> 303 W. 66th Street, 9HE
> New York, NY 10023
> 212.874.9626
>