I assume this is NOT back-coated. In general, non-back-coated tape that
squeals rarely responds to baking.
If the LAST Factory lubricant does not work, try D5
(decamethylcyclopentasiloxane) which I discuss i several posts on my
The overly wide slitting can also benefit from widening the tape guides.
I made one set slightly wider to accommodate 6.5 mm WWII era German
tape. Fortunately, on the Sony APR, the tight guides are on the head
assembly (you can easily tweak the width of the transport guides as they
are switchable to 1/2-inch). Also, fortunately, they are full 360 degree
guides, so I only notched a minimum portion, so by loosening and
rotating the guide, I'm back to a normal guide.
My sense with the Melody 169 that little things were attaching
themselves to the heads and then those were catching...but it was small
quantities, nothing like say Ampex 406 (which does respond to baking).
On 2019-08-24 3:30 p.m., Charles Reinsch wrote:
> I've got about forty 7" reels of Melody 166 (1.5mil polyester) recorded
> in 1969/70, with more on the way. So far I've been able to digitize 22
> of them, but 5 have presented issues of oxide(?) squeal. I am looking
> for suggestions.
> About the only reference I've found to Melody was Richard Hess
> discussing soft binder (in Melody 169) in his Degrading Tapes paper. He
> mentions that 169 was "3M seconds" and that it also suffered from
> slitting issues leaving it sometimes over wide, both of which I suspect
> are also true of 166.
> My tapes have no symptoms of sticky shed, and relatively little oxide
> shed. They were very dirty, and have been wiped with Pellon or another
> non-abrasive lint free fabric. With the problem tapes I've applied LAST
> magnetic tape preservative, hoping its lubricant properties would help
> even a buckling oversize tape get through the guides without oscillating.
> I am using an Otari 5050, cleaning the guides, heads, and pinch roller
> between reels (and sides).
Richard L. Hess email: [log in to unmask]
Aurora, Ontario, Canada 647 479 2800
Track Format - Speed - Equalization - Azimuth - Noise Reduction
Quality tape transfers -- even from hard-to-play tapes.