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Re: [ARSCLIST] Tape baking question
Guys, I think all of that type of black oxide / no-backcoat tape can develope this problem but it
doesn't seem to be a sure thing that the problem will develop. I've had it in small does (ie
clay-like residue on the heads and guides, but not enough to hamper playback or cause squealing --
more like "skid marks" on some surfaces sometimes) from early 60's Scotch 202 also.
Question that comes to mind is, did the black oxide require a different binder or could there be
something different in the oxide mix that reacts with "traditional" binder to cause this problem
I, too, have used dozens of reels of 175 and not had problems.
And, adding yet another depressing layer to this whole thing, Scotch 206 and 208 are supposed to
"never" develop sticky-shed. Well, I've had one reel of each do it. Both were stored for long
periods in damp enough conditions that the boxes were moldy. It's only been those two reels and
otherwise, I have 30-year-old reels of Scotch 206 that still play back at their original levels,
making them as hearty as old AudioTape.
-- Tom Fine
----- Original Message -----
From: "David Lennick" <dlennick@xxxxxxxxxxxx>
Sent: Tuesday, October 10, 2006 10:03 PM
Subject: Re: [ARSCLIST] Tape baking question
I have never had a problem with 175 and I've run hundreds of reels of the stuff.
On the other hand, a reel of *275* (looks identical) that came from ORTF in the
mid 70s jammed up a Studer at CBC Edmonton for a day and a half in about 1983. As
far as I can recall, that's the only defective reel I've known of that stuff as
(Where do I find a fridge that will hold a Teac A3300SX-2T?)
"Richard L. Hess" wrote:
I invented the cold-playing process--put the player in the fridge
along with the tape...I presented that Sunday at the AES in San
Tapes that do not respond to baking and still squeal such as Sony
PR-150 and 3M 175 do respond to being played below their current glass
transition temperature (Tg). The binder degradation has lowered the Tg
to below room temperature.
Cold-desiccation, as I understand Peter's process, is different. I
don't think he plays the tape cold.
It seems we're all incoherent. I'm in western Nebraska on my way back
from SF. Tomorrow I pick up yet another tape recorder in Des Moines.
Quoting David Lennick <dlennick@xxxxxxxxxxxx>:
> Lists wrote:
>> I invented the cold-desiccation process and, while it is very helpful in
>> many circumstances, it is time consuming and not, always, the best
>> alternative. If you simply have "sticky-shed" (binder hydrolysis), it may
>> not be necessary. If you have inter-wrap adhesion or binder-base adhesion
>> problems, then it can be a necessity.
> This is something I want to know about..it appears that non
> back-coated Shamrock
> needs this process, which explains why some tapes I loaned the CBC a
> few years
> ago didn't respond to baking.
> Hey..Shamrock cost $1.29 for an 1800-foot reel in the seventies and we all
> bought the stuff!