Hi Charles,
If you havent already done so, I would carefully lay the machine on
its back and watch how the tape interacts with the heads and guides.
The tape shouldnt deform, curl or crinkle.
Worn tape heads arent good for oversized tapes which may not sit flat
inside the existing wear groove in the head, getting caught on one of
the unworn shoulders of the head, giving poor head to tape contact
and lousy reproduction. If the heads have a significant wear
groove this might be a good time to have them relapped.
Cheers,
Tim
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From: "Association for Recorded Sound Discussion List"
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Sent:Sat, 24 Aug 2019 12:30:04 -0700
Subject:[ARSCLIST] Melody 166 recording tape
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).
Thanks,
Chuck
--
Charles Reinsch
KRAB Archive: www.krabarchive.com
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