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#1
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Spectroscopy identifies deterioration degree in old tapes
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#2
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Spectroscopy identifies deterioration degree in old tapes
Jason wrote:
http://cen.acs.org/articles/93/web/2...ing-Old-Tapes- Playability.html Interesting! The good things about this: 1. It identifies some compounds (if only by absorption spectrum) that indicate binder breakdown which can be more carefully analyzed in the future. 2. It indicates problems with the tape binder itself rather than just the backcoating, providing additional validation to the theory that it is the binder itself breaking down. The bad things about it: 1. The test itself is not practical for spot-checking tape libraries. The reel has to be pulled and unreeled for the surface to be analyzed. What is needed is a swab that can be wiped on the outer edge of the tape wind and then analyzed either in a machine or by eye. 2. The overlap between tests of playable and unplayable tape is great, so this test will either produce a lot of false positives or false negatives depending on how it's calibrated. I'm not saying this isn't useful research, I'm just saying that as a production test this is of limited use. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#3
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Spectroscopy identifies deterioration degree in old tapes
On 9/9/2015 2:06 PM, Scott Dorsey wrote:
Jason wrote: http://cen.acs.org/articles/93/web/2...ing-Old-Tapes- Playability.html Interesting! The good things about this: 1. It identifies some compounds (if only by absorption spectrum) that indicate binder breakdown which can be more carefully analyzed in the future. 2. It indicates problems with the tape binder itself rather than just the backcoating, providing additional validation to the theory that it is the binder itself breaking down. The bad things about it: 1. The test itself is not practical for spot-checking tape libraries. The reel has to be pulled and unreeled for the surface to be analyzed. What is needed is a swab that can be wiped on the outer edge of the tape wind and then analyzed either in a machine or by eye. 2. The overlap between tests of playable and unplayable tape is great, so this test will either produce a lot of false positives or false negatives depending on how it's calibrated. I'm not saying this isn't useful research, I'm just saying that as a production test this is of limited use. --scott I got the impression this was more of an archivist's curation tool than a production test. Um, what kind of production did you have in mind? == Later... Ron Capik -- |
#4
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Spectroscopy identifies deterioration degree in old tapes
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#5
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Spectroscopy identifies deterioration degree in old tapes
Jason wrote:
In article , says... I got the impression this was more of an archivist's curation tool than a production test. Um, what kind of production did you have in mind? That's what I thought, too, hence the interest by the Smithsonian. By production I mean a continuous assembly-line operation, of the "here are 10,000 tapes, tell us which ones are bad in two weeks" type, as opposed to a development project. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#6
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Spectroscopy identifies deterioration degree in old tapes
On 9/9/2015 9:15 PM, Scott Dorsey wrote:
Jason wrote: In article , says... I got the impression this was more of an archivist's curation tool than a production test. Um, what kind of production did you have in mind? That's what I thought, too, hence the interest by the Smithsonian. By production I mean a continuous assembly-line operation, of the "here are 10,000 tapes, tell us which ones are bad in two weeks" type, as opposed to a development project. --scott Hmm, who might be looking to do such a thing? == Later... Ron Capik -- |
#7
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Spectroscopy identifies deterioration degree in old tapes
On 10/09/2015 04:11, Ron C wrote:
On 9/9/2015 9:15 PM, Scott Dorsey wrote: Jason wrote: In article , says... I got the impression this was more of an archivist's curation tool than a production test. Um, what kind of production did you have in mind? That's what I thought, too, hence the interest by the Smithsonian. By production I mean a continuous assembly-line operation, of the "here are 10,000 tapes, tell us which ones are bad in two weeks" type, as opposed to a development project. --scott Hmm, who might be looking to do such a thing? Any large tape library, such as the Smithsonian or British Library or even a record company with a warehouse full of master tapes they don't have time to check by playing. It would be very handy if it could tell you which tapes have problems before they get too bad to play back, so you could back them up in time, especially in the case of some early digital recordings, as some have been lost due to the digital cliff effect of perfect playback one day, and total failure of the error correction to cope when they were played the following month. -- Tciao for Now! John. |
#8
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Spectroscopy identifies deterioration degree in old tapes
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#9
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Spectroscopy identifies deterioration degree in old tapes
On Tuesday, September 8, 2015 at 9:12:29 PM UTC-4, Jason wrote:
http://cen.acs.org/articles/93/web/2...ing-Old-Tapes- Playability.html There's a chemical engineer down in Annapolis who has a process for removing sticky shed back coating that's supposedly much better than baking tape, if that's any help. James Richardson: (410) 757-3733 Regards, Ty Ford |
#10
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Spectroscopy identifies deterioration degree in old tapes
Jason wrote:
In article , says... or even a record company with a warehouse full of master tapes they don't have time to check by playing Five miles from where I live, there is an Iron Mountain underground storage site. It contains all the masters that Sony Entertainment has produced - audio and video. I know someone who works there - I'll ask if they're using this kind of technology. I don't think anyone is. People who are doing general assessment might be pulling reels out to spot check on a machine or with their thumb, but I don't think anyone is doing full archives surveys anywhere yet. As I said, it needs to be made faster and more convenient before people will use it. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#11
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Spectroscopy identifies deterioration degree in old tapes
On 9/11/2015 10:04 AM, Scott Dorsey wrote:
I don't think anyone is. People who are doing general assessment might be pulling reels out to spot check on a machine or with their thumb, but I don't think anyone is doing full archives surveys anywhere yet. Well, the Library of Congress is one of the participants in this project, and the have a lot of tape. I expect that they would be a likely candidate if it proved to be an efficient and reliable process. Otherwise, an educated thumb would likely work pretty well. -- "Today's production equipment is IT based and cannot be operated without a passing knowledge of computing, although it seems that it can be operated without a passing knowledge of audio" - John Watkinson Drop by http://mikeriversaudio.wordpress.com now and then |
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