Re: [ARSCLIST] Dry tape squeal problem

["Marie O'Connell" <Marie.OConnell@xxxxxxx>]

Dear Ed and Peter

Thank you for mentioning my unique invention!  Infact, I no longer work at
Sound Archives/Nga Taonga Korero in New Zealand.  I am now the Sound
Archivist for the Center for Oral History & Cultural Heritage at the
University of Southern Mississippi.  My email there is
marie.oconnell@xxxxxxx

If you would like further information about my invention please feel free to
contact me.

Regards

Marie O'Connell


----- Original Message -----
From: "Copeland, Peter" <Peter.Copeland@xxxxx>
To: <ARSCLIST@xxxxxxxxxxxx>
Sent: Monday, February 10, 2003 9:09 AM
Subject: Re: [ARSCLIST] Dry tape squeal problem


> Dear Ed,
>     Having used silicone fluids for another purpose (damping the
resonances
> in disc-recording cutter-heads for LPs), I can conjecture what is wanted,
> and I cannot see what harm could be done. (Although, as always, I'd try it
> on a section of unrecorded tape first, if you have any).
>     I used silicone fluid from a company called Midland Silicones here in
> Britain, which was available in various viscosities (that is, internal
> frictional stiffness). I usually used 60 centistoke, and when resonances
> weren't sufficiently controlled, 200 centistoke. For reducing dry tape
> squeal, I would say that you would need something less viscous - say about
> 20 centistokes.
>     The fluid is quite difficult to keep in place - it would "soak into"
the
> magnetic oxide of any magnetic recording tape - so I would advise you only
> to use it on tapes of your own property, and then to get the sound off as
> quickly as you can.
>     Both aims might be served by the invention of Marie O'Connell and Noel
> McGinnity of the National Sound Archives of New Zealand
> <moconnell@xxxxxxxxxxxxxxxxxxx>. She used an intravenous drip bag to coat
> the tape as it played on a Studer B67. In her case, she was attempting to
> deal with the more-usual type of "sticky tape" using isopropyl alcohol;
but
> I cannot see why the same idea should not be used for silicone fluid. This
> was made feasible - with Kiwi ingenuity at its best - by running the tape
> across a car windscreen-wiper blade before it reached the takeup reel!
> Peter Copeland
>
> -----Original Message-----
> From: Edward A. Falk [mailto:falk@xxxxxxxxx]
> Sent: 24 January 2003 17:15
> To: ARSCLIST@xxxxxxxxxxxx
> Subject: [ARSCLIST] Dry tape squeal problem
>
> Hi all; I'm involved in an audio restoration project.  In 1999 there
> were some messages on this list about the problem, but I haven't
> been able to find any definitive answers.
>
> Note that "dry tape squeal" is not the same as sticky-shed.  Dry
> tape squeal happens when the tape's original lubricant has dried up
> due to age.
>
> Is there any approved process to re-lubricate a tape?  I'm loathe
> to go out and buy any random silicone libricant or whatever and
> start spraying.
>
> There was an article out of the library of congress
>
>   http://www.unesco.org/webworld/ramp/html/r9704e/r9704e11.htm
>
> which says to apply a "silicone solution or Krytox" but I'm not entirely
> sure what this even means.  (Krytox is an entire product line from
DuPont.)
>
> Can anybody tell me what the approved solution is?
>
> ADVthanxANCE,
>
>         -ed falk
>
>
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