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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