Dear Mark,

I used a great deal of 3M 206 and 207 from its introduction. It always
behaved well and never displayed binder hydrolysis symptoms. However, I
graduated to digital in 1982, so how later iterations of 206/7 behaved is
beyond me, except to say that I never heard of it developing binder
hydrolysis. 3M's manufacturing was centered in Minnesota and New Jersey,
and the former plant produced a more consistent product than the latter. We
did encounter mis-slitting and defective oxide at times, and subsequently
learned that those problems were frequently encountered in the NJ plant.

Good luck with the a/d.


On Mon, Oct 23, 2017 at 11:22 AM, Hood, Mark <[log in to unmask]> wrote:

> I am about to digitize a daily large batch of quarter-inch tapes, most of
> which I believe to be 3M 206.  There were professionally recorded and have
> been stored in a variety of conditions since the mid-70s, but in a pretty
> stable environment for the last 20 years.
> I'd like to solicit everyone's current experience and protocols when
> dealing with Scotch 206 - specifically, are you baking prior to spooling,
> or is 206 currently behaving well enough that a blanket baking policy is
> not required?
> And if you are baking 206 at any point in the process, what baking times
> and temperatures are you all using for quarter-inch stock?
> Many thanks,
> Mark
> Mark Hood
> Associate Professor of Music
> Department of Audio Engineering and Sound Production
> IU Jacobs School of Music

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