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I have also experienced sticking winds on SoundMirror tape, the one I had only seemed to show it on the first few winds, unwinding led to slight oxide loss, the later turns were fine.

 The pack was quite loose but that is quite a common feature of cheap machines.

 As I recall the noise floor was fairly high, but I attributed that to the record electronics which were likely not quite up to Nagra standards!

 The tapes were off air recordings of News reports about Sputnik and the moon landing and were quite exciting to hear for someone who wasn't there at the time.


Best, Stuart.
Archival AV Technician,
School of Scottish Studies Archives.


-- 
The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.


-----Original Message-----
From: Association for Recorded Sound Discussion List [mailto:[log in to unmask]] On Behalf Of Tim Gillett
Sent: 29 October 2018 14:27
To: [log in to unmask]
Subject: Re: [ARSCLIST] Soundmirror tapes

Thanks Douglas,

It seems then that so far, the sticking winds is an isolated case.

I mentioned earlier that the very high noise floor seems confined to the actual recording. I suspect the machine used initially (early 1950's) was a 
Soundmirror which apparently used a permanent magnet erase head.   When I 
made a new recording on an unused piece of the paper tape, on a modern era machine (Nagra 4.2), the noise was  much lower than on the original recording.

Tim Gillett



----- Original Message -----
From: "Douglas Pomeroy" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, October 29, 2018 12:14 AM
Subject: [ARSCLIST] Soundmirror tapes


Tim,

i have several of those paper-backed tapes, stored unprofessionally in 
Californian and New York
since they were recorded in January 1948. None of them have the problem you 
describe, and they
all play well, and I wouldn't call them unusually noisy either.


Date: Tue, 16 Oct 2018 20:32:39 +0800
From: Tim Gillett <[log in to unmask]>
Subject: Soundmirror paper 1/4" tape

Hello,

I'm having problems with some very early Soundmirror tapes using a paper 
backing, circa late 40's early fifties I guess. I suspect they havent been 
wound or played for many decades. They contain live recordings of mainly 
classical oratorio concerts.

The tape wind is semi sticking to the next wind in varying degrees depending 
on the tape in question. With a couple I've been able to slowly wind them 
off without tape breakage or loss of oxide. Once they have been unstuck and 
spooled onto the take up reel they remain unstuck and play well. I've been 
able to repair old splices and clean off old spreading adhesive.

But this one is more sticky and further into the reel I go it has started to 
really stick to the next wind and rip off small pieces of oxide (I guess 
more tension from being under a constant torque wind for many years has made 
the inner layers stick more to each other).

Any hints on treating the tape to help it wind off without damage, or with 
less damage? Heat, humidity etc?

Thanks,

Tim Gillett
Perth,
Western Australia

Douglas Pomeroy
Audio Restoration and Mastering Services
193 Baltic St
Brooklyn, NY 11201-6173
(718) 855-2650
[log in to unmask]
Music Over Business 


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