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I would also try a wide roller machine for this tape like an A80 or an 
ATR-100. The small rollers and guides on the mx could be aggravating the 
effect.
Shai
בתאריך 01/04/13 6:40 PM, ציטוט Richard L. Hess:
> Hi, Curtis,
>
> I've been baking longer, but edge shedding as you describe is common 
> if the tape is slit a bit wide (hard to measure, but that is why the 
> event is so random--it might be one reel out of a jumbo roll where the 
> slitting blades were mis-adjusted).
>
> I don't think 24 hours (my norm these days) would show a difference as 
> I saw this off some 1/2-inch 456 just recently, but it was only the edge.
>
> It is frightening, but I'd just vacuum up the little hairs and be done 
> with it. Remember, those are about a mil wide and you're dealing with 
> nominally 82-mil (minimum spec'd is 75 mil from Ampex) track width 
> that doesn't even go completely to the edge, so you probably don't 
> have any sound on the little hairs. (I did want to write "hares" in 
> honour of the season. <smile>)
>
> I would check for debris in the corners of the guides (where the face 
> meets the top and bottom caps) which can exacerbate this hair-shred 
> but, overall, if it's coming just from the edges, I think you're safe.
>
> I see 456 doing this more (though I've seen it more on 1/2-inch than 
> 1/4-inch). It has also happened on Agfa and BASF, but not regularly.
>
> I don't have this variant specifically listed, but you might find this 
> resource of use:
> http://richardhess.com/notes/formats/magnetic-media/magnetic-tapes/analog-audio/degrading-tapes/ 
>
>
> Good luck!
>
> Cheers,
>
> Richard
>
> On 2013-04-01 12:10 PM, Peoples, Curtis wrote:
>> Hi Richard,
>>
>> I believe the tape is Ampex 456, not positive though. The studio 
>> generally bought Ampex 456 tape. It is a ten inch, quarter inch reel 
>> (two track master recording). For this collection, we bake 8 hours at 
>> 130 degrees. We have found this to be a suitable process for this 
>> collection. The shredding appears to be from the edges. We are 
>> transferring on a relatively new Otari MX 5050. The machine was 
>> cleaned so I don't have pics of the shred. They are usually about 3 
>> inches long before breaking and are about the thickness of fine hair.
>>
>> Best,
>>
>> Curtis
>>
>> -----Original Message-----
>> From: Association for Recorded Sound Discussion List 
>> [mailto:[log in to unmask]] On Behalf Of Richard L. Hess
>> Sent: Monday, April 01, 2013 10:48 AM
>> To: [log in to unmask]
>> Subject: Re: [ARSCLIST] Sticky SHRED
>>
>> Hi, Curtis,
>>
>> Please provide specifics as to type of tape, width, reel type, baking 
>> process and duration.
>>
>> Also photographs are really useful.
>>
>> Is the shredding from the edges only or across the entire width of 
>> the tape?
>>
>> What is the playback machine?
>>
>> Cheers,
>>
>> Richard
>>
>> On 2013-04-01 10:35 AM, Peoples, Curtis wrote:
>>> Hi Folks,
>>>
>>> We have a collection of tapes that have sticky shed and we are 
>>> baking and transferring them. Things are going as planned except for 
>>> one tape. It is shredding into fine hair like stands. I thought it 
>>> needed to be baked longer so I baked it a second time. Same problem. 
>>> I have seen tape shed before and this looks different.
>>>
>>> Any help identifying the problem is greatly appreciated.
>>>
>>> Best,
>>>
>>> Curtis L. Peoples, Ph.D.
>>> Associate Archivist, Crossroads Music Archive,
>>> www.crossroadsofmusic.ttu.edu<http://www.crossroadsofmusic.ttu.edu/>
>>> Unit Head, Crossroads Recording Studio,
>>> http://library.ttu.edu/crossroadsrecordingstudio/
>>> Director, TTU Americana Ensemble,
>>> http://ttuamericanaensemble.weebly.com/index.html
>>>
>>> Contact Info:
>>> Southwest Collection, Texas Tech University P. O. Box 41041 Lubbock,
>>> Texas 79409-1041
>>> Email: [log in to unmask]
>>> TEL: 806-742-3749 ext. 278
>>> FAX: 806-742-0496
>>>
>

-- 
בברכה,
שי דרורי
מומחה לשימור והמרה של אודיו וידאו וסרטים 8-35 ממ.