I think we had a discussion about these two in the past. The PR-150 has
some batches that run fine but most do squeal. I haven't even tried baking
them except once just for the hell of it and of course no luck. Double
speed playback works when possible but I haven't had any lately so haven't
tried cold play yet.
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On Mon, Jan 25, 2016 at 6:10 AM, Richard L. Hess <[log in to unmask]>
> Hi, John,
> This is indeed true. HOWEVER, my success rate for baking tapes that are
> suffering from squealing and/or deposition that are not back coated is much
> This raises another question. If all binder breakdown is hydrolysis, then
> why doesn't baking cure it 100%? I'm thinking of Sony PR-150 and 3M-175.
> These two seem to show the falling Tg, but don't have the shedding. They
> are outliers and inconsistent.
> On 1/24/2016 3:41 PM, John Schroth wrote:
>> Back-coating may instigate or speed up the hydrolysis process but I
>> cannot ignore the fact that there are still obscure instances where the
>> tape had no back-coating and suffered from SS. Richard, you have noted
>> this in the past and I have had this happen in at least two instances
>> that I can recall. I'm at home today so I don't have access to my notes,
>> but it was clearly sticky shed on tapes that had no back-coating. So one
>> should not "always" equate back-coating with sticky shed.
>> Just my two cents...
>> John Schroth
> Richard L. Hess email: [log in to unmask]
> Aurora, Ontario, Canada 647 479 2800
> Quality tape transfers -- even from hard-to-play tapes.