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ARSCLIST  October 2018

ARSCLIST October 2018

Subject:

Re: Soundmirror paper 1/4" tape

From:

Tim Gillett <[log in to unmask]>

Reply-To:

Association for Recorded Sound Discussion List <[log in to unmask]>

Date:

Wed, 17 Oct 2018 04:58:28 +0800

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (141 lines)

Hi Corey,

No, definitely not normal sticky shed or even any stickiness.

My tentative guess is that with time and pressure the rough surface of the 
paper backing has imprinted itself onto the adjacent layer's smoother oxide 
surface so that   many tiny "interlock" or clasp points have formed. On the 
sections where the winds have separated without damage, the interlocks have 
released and now there is no longer a stiction in those sections. I can 
rewind the tape back from where the tape stopped and it winds perfectly.  No 
stiction. For a paper tape, the pack is quite good. When I run the tape 
forward, as soon as it gets to the point where I stopped separating the 
wind, the adhesion resumes.

It's complicated by  various sticky tape splices which have gone gooey and 
oozed, causing adhesions at those points but that's a separate issue.

Yes there are unrecorded sections which I can experiment with.

Thanks,
Tim


----- Original Message ----- 
From: "Corey Bailey" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, October 17, 2018 4:12 AM
Subject: Re: [ARSCLIST] Soundmirror paper 1/4" tape


> Hi Tim,
>
> It's hard to recommend a solution without visually assessing the problem. 
> For polyester base tapes that have layer-to-layer adhesion, I usually have 
> to bake them at a lowered temperature (118° F. or less) for 6 to 8 hours 
> and then I will check the tape again. For paper backed tape, baking may 
> not work. Is there an unrecorded section that you could use for testing? 
> For me, baking audio tape is reserved as a last resort. Layer-to-layer 
> adhesion is the one exception.
>
> Cheers!
>
> Corey
>
> Corey Bailey Audio Engineering
> www.baileyzone.net
>
> On 10/16/2018 6:11 AM, Tim Gillett wrote:
>> Thanks Gary,
>>
>> Yes having had experience with one tape like this 15 years ago (from the 
>> same person's archive) I'm aware of the centre track, the tracks 2 and 3 
>> capture and the azimuth corrector technique. It's just a shame I wasnt 
>> aware of this sticking problem back then as I guess if I'd unwound them 
>> then it wouldnt have been as much of a problem as has now become 15 years 
>> on.
>>
>> I only recently discovered that the tapes have been stored in less than 
>> ideal conditions with high humidity and evidence of mould on some tapes 
>> (but apparently not on any of these Soundmirror tapes that I can see.
>>
>> Yes hoping Richard Hess or maybe Peter Brothers might have experience 
>> with this sticky problem.
>>
>> Regards,
>>
>> Tim.
>>
>>
>> ----- Original Message ----- From: "Gary A. Galo" <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: Tuesday, October 16, 2018 8:57 PM
>> Subject: Re: [ARSCLIST] Soundmirror paper 1/4" tape
>>
>>
>> Hi Tim,
>>
>> This is a strange problem. I've worked with quite a few Brush Soundmirror 
>> tapes in our archive, and the only spots where I found any sticking was 
>> on a couple that had leader tape spliced on at the beginning. But, it was 
>> confined to that spot, and not all the way through.
>>
>> Regarding playback on modern equipment, I use tracks 2 and 3 of a 
>> 4-channel head. They fit right over that single half track on the 
>> Soundmirror tapes. The stereo playback allows proper azimuth adjustment, 
>> and gets you inside of most of the edge curl that may have occurred. It 
>> may also get you inside any oxide shedding that may happen, if that 
>> stickiness is confined to the edges. Then I put the two channels through 
>> a phase corrector before summing them to mono.
>>
>> Richard Hess may be able to better address the sticking problem.
>>
>> Best
>> Gary
>>
>> Gary Galo
>> Audio Engineer Emeritus
>> The Crane School of Music
>> SUNY at Potsdam, NY 13676
>>
>> ________________________________
>> From: Association for Recorded Sound Discussion List 
>> <[log in to unmask]> on behalf of Tim Gillett 
>> <[log in to unmask]>
>> Sent: Tuesday, October 16, 2018 8:32:39 AM
>> To: [log in to unmask]
>> Subject: [ARSCLIST] 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 


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