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Re: [ARSCLIST] Fwd: Sticky AGFA PEM 469

Great discussion! I was looking for a list of the Ampex tape products similar to the links regarding 3M and Agfa/BASF/IGF tapes? Also, has anyone seen a site with photos of different tape formulas that would help identify unknown tape brands/types?
Steve Koto
On Apr 3, 2008, at 7:28 AM, Richard L. Hess wrote:

I think the listing on the Ampex site of SSS tapes hits the high points.

There are multiple issues.

At this point there is one major failure mode for polyester (PET) base film magnetic tape:

This can manifest itself in many ways:
(a) Soft Binder Syndrome - I see this as generic where the binder softens
- on some tapes the glass transition temperature falls to below room temp
- one instance Tg was +8C measured
- cold playing may work on tapes that don't have other problems / solutions
- cold playing seems to work now on Sony PR-150 and 3M 175
(b) Sticky Shed Syndrome
- While the binder has gone soft there is far more shedding than the generic SBS
- Baking or Pellon wiping appears to cure this. I prefer baking
- Baking times are going up
- This appears to work with all of the tapes (except perhaps Q15) listed on
the Ampex site
(c) Loss of Lubricant
- While theorized, no tape has yet been identified chemically with LoL
- LoL in concept can be explained by not loss of lubricant but increase in friction
see (a) and (b) above
(d) Squeal that doesn't respond to (a) or (b) above that while probably not (c) can
nonetheless be played with additional lubrication be it isopropyl (Thanks, Kiwi) or
D5 (Thanks, Scott). Search MARIE in my blog
(e) In at least one instance with Shamrock 031 it did not respond to the indicated treatment
in (a) or (b) but higher speed playing on a different topology machine Search SHAMROCK
in my blog



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