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
experiencing may be due to mis-slittling. Shamrock always sheds oxide,
stopping at intervals to clean it should be the only interruption to
ana/d transfer into a digital editor and then stringing it together the
transfer. One man's opinion, anyway. Good luck,



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 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:

Dennis D. Rooney
303 W. 66th Street, 9HE
New York, NY 10023