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.



Corey Bailey Audio Engineering

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