Restoration Tips & Notes Working with audio media (mostly tape) restoration

2015-01-11

A New Year’s view of at-risk audio formats

Filed under: -general,archive operations,audio,project notes — Richard L. Hess @ 17:25

There are many factors that affect the ability of people like us to digitize tapes for you, our clients.

One of the most difficult issues to balance is the physical space that different formats take up, the ongoing maintenance of these formats, and, to be brutally honest, their return on investment.

What we discovered is that some of the machines we were archiving for future use would not work when they were brought out of storage. Rubber parts, capacitors, and lubrication are probably the most prevalent causes of failure. We have said to clients more than once (with a wry smile), “Yes we can probably restore your tape, but first we need to restore a machine.”

Manufacturer and maintenance depot support for various formats is waning or fully discontinued. Parts are hard to come by, and good machinists with an interest in doing this are either non-existent or very expensive.

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2014-04-14

Protecting the container: Heritage Building Fire Safety

Filed under: archival practices,history,infrastructure — Richard L. Hess @ 16:53

While this post does not specifically pertain to audio tape restoration, it does pertain to keeping originals and copies safe, especially in heritage buildings.

This article is prompted by a devastating fire in Aurora, Ontario, Canada, where I have lived for the last 10 years and also from 1981-1983. On Friday, April 11th, there was some roofing work being done on the 135-year-old Aurora United Church. Roofers were using hot tar and allegedly some sort of open flame. Humidity is not high in the winter and we had a cold one. The church roof structure (and much of the ceiling structure of the nave) was wood. Hot tar, flame, low humidity, wind, and very dry old wood do not mix well, and the results, sadly, were predictable. The church is now a ruin. The fire department spent 4-5 hours with up to maybe 7-8 master streams running into the attic and other parts of the structure.

2014-04-12_19.01.24

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2013-10-01

Thoughts about 8-track cartridges…

Filed under: archival practices,project notes,Tape Aging — Richard L. Hess @ 20:02

I have just transferred three 8-track cartridges and I thought I’d share my thoughts about these transfers and what are realistic expectations for these cartridges. (more…)

2013-08-13

A summer of archiving…

Filed under: archival practices,project notes,scanning,still images — Richard L. Hess @ 22:33

This summer [2013], we have completed the project we described at the end of last summer. We began the summer of 2008, with Robert working every summer to some degree since. Michael split the work with Robert in 2009. More commentary below the graphic (UPDATED 2013-08-31) after the break.
(more…)

2012-10-09

Source for D5 (Decamethylcyclopentasiloxane)

Filed under: Decamethylcyclopentasiloxane,Tape Aging,tools — Richard L. Hess @ 09:13

I have recently been looking to replenish my supply of D5 (Decamethylcyclopentasiloxane) and did not have much luck receiving replies to my email. Others have reported difficulty finding this in quantities smaller than a 55-gallon drum.

I found a promising listing for cyclopentasiloxane and when I queried the supplier, he indicated that the analysis was 97.5% decamethylcyclopentasiloxane and the balance being octomethylcyclopentasiloxane. I suspect that is more than good enough for tape work.

(more…)

2012-10-01

Playing a squealing reel of Sony PR-150 tape using D5 (Decamethylcyclopentasiloxane)

Today I worked on a batch of five Sony PR-150 7-inch reels recorded at 3.75 in/s in one direction, two-track mono. One of the five reels showed marked shedding during fast-wind/rewind (to get the original reel as takeup and to check the tape pack). Four of the five reels played fine. This one squealed horribly. I ran the tape up and back over the dispenser and then fixed it in position for running the tape over it during the playback session. Once again, D5, Decamethylcyclopentasiloxane, CAS Number 541-02-6 comes to the rescue. The lovely thing about D5 is that it evaporates.

APR-5003 with D5 dispenser

Is this better than cold playback? I don’t honestly know. Both work. This is easier if there is no reel machine standing by for cold playback (which there was not today). I keep a Nakamichi MR-1 in the refrigerator so it is ready to go when I need it. The Studer A810 I put in the fridge did not like it. The capstan motor seized up AND the heat output overwhelmed the refrigerator’s capacity to cool. I suspect the APR would also overwhelm the refrigerator’s capacity. Also, it is much easier to lubricate a reel than a cassette.

 

2012-09-20

Speed variation with unmatched reels

Filed under: archival practices,reels — Richard L. Hess @ 07:36

I received an interesting question from a European tape user with whom I frequently correspond:

“Is there any speed variation when playing a tape with different hubs on the supply reel and take-up reel?”

And I replied:

You raise an interesting question. The easiest answer to this is simple:
There is a risk of speed variations throughout the reel if the tape tension varies throughout the reel.
followed by the corollary:
This effect is made worse if the condition of the capstan / pinch-roller system is degraded.
and
Some capstan / pinch-roller / constant-torque systems handle this better than others.

(more…)

2012-07-20

DTRS (DA-88) Transfers now available through TASCAM

Filed under: digital,outsourcing — Richard L. Hess @ 16:00

TASCAM has set up a very reasonably priced transfer service for multiple-cassette projects recorded in the DTRS format (DA88, etc.).

For more information, click here.

I cannot warrant this service, but what could be better than having it attached to the service facility. I have listed other resources on my format page.

 

2012-02-26

Agfa PEM-469 success

Filed under: project notes,storage-care-handling,Tape Aging — Richard L. Hess @ 12:39

We had success transferring two reels of one-inch Agfa PEM-469 tape that was shedding and leaving a waxy clear-to-yellow exudate on everything. We were happy to get through these and recover the content. This is discussed in more detail towards the bottom of our Degrading Tapes page—hopefully the most up-to-date resource on the Web about problem tapes. Please let me know if you would like to help me add anything to the page. It is there for everyone struggling with old degrading tapes. If you haven’t looked already, please look at my paper on the subject.

2012-01-06

Capturing both directions of a half-track mono tape

Filed under: archival practices,matching head to tape,recording/mastering — Richard L. Hess @ 15:39

It is possible to capture both directions of a two-sided half-track mono tape in one pass.

The critical factors are:

  • Azimuth
  • Direction
  • Polarity

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Playing full-track mono tapes

Filed under: archival practices,matching head to tape — Richard L. Hess @ 15:28

About ten years ago, when I transferred the oldest tapes in the United States as part of the Mullin-Palmer collection, my good friend Don Ososke pressured me to use a full-track head for the project. I had started transferring these full-track tapes with a Woelke NAB stereo (two 80 mil (2 mm) tracks) head and recording both channels. When I obtained a Nortronics full-track head, the difference was night-and-day. The full-track reproduction sounded fuller, smoother, and quieter. There were no tracking problems to speak of that would cause azimuth wander large enough to create a “flanging” or “phasing” effect of in-and-out high-frequency loss. (more…)

2011-11-22

Obsolete data formats

Filed under: archive operations,audio,computer/data,history,video — Richard L. Hess @ 19:19

This is a reminder that data formats come and go just like audio and video formats. On this, the 48th anniversary of the JFK assassination, this article was posted at the Library of Congress website. It talks about first locating and then converting research data held on IBM 80-column punch cards. I remember working with those my first summer job back in 1967! I guess I have a penchant for obsolete formats, as I learned a good deal about IBM’s unit record equipment, including the amazing 407 (introduced in 1949). That certainly was not as useful as knowing about analog tape now.

The punch cards were found and converted. This is a much happier fate than that suffered by the original IRIG 14-track 1-inch tapes of the Apollo Moon Walk from 1969! I am currently digitizing 14-track 1-inch seismic tapes surrounding the Mount St. Helens eruption in 1980. (more…)

2011-11-05

Personal Image Scanning Project

Filed under: project notes,scanning,still images — Richard L. Hess @ 15:46

In the 2007-2008 school year, my son Robert asked me why we did not have all our family images in the computer as there were some that he needed for a report. Since this was a project I had desired to undertake for some time (but who has the time), I responded with “I’m very glad you asked, what are you doing for a summer job?”

As of September, 2012, the bulk of the work has been completed and here are the statistics:

scanning stats 2012-09-11

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2011-10-02

DAT’s not good…but I’m back in the business

Filed under: digital,Tape Aging — Richard L. Hess @ 19:49

The long-term maintenance of digital formats that I do not get a great call for has become a burden. While I would like to have all formats available for all people, I have such a backlog of analog, that I will not be accepting digital-only projects in many formats that I used to.

The formats that I am currently committed to transferring are:

—DATs with two options:
         -straight transfer where we listen for glitches and look at the waveform for glitches (four Tascam DA-20 MKII)
         -error-logged transfer where the machine logs all of the errors it has concealed (Sony PCM 7030)
—PCM-F1 on VHS or Betamax (multiple machines and multiple ES-601 and PCM-F1 decoders)
—Sony DASH (3202 or 3402) 2-channel reel (two each Sony PCM-3202 and PCM-3402)
—MiniDisc (normal stereo in regular and HI-MD, but not porta-studio multitrack; multiple )
          (Sony MZ-RH1 Hi-MD Minidisc recorder with USB download; Sony MDS JE-530 and two other MD players)
—Digital Files on CD, DVD, hard drive, USB drives, etc.
—CD
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2011-08-22

Slide Storage Warning – Airequipt 2 x 2 Slide File

Filed under: archival practices,photography — Richard L. Hess @ 14:06

Over the years, I’ve used various methods of storing 35 mm colour transparencies. Until 1992, I used mostly metal slide boxes, but I do have about five Airequipt 2 x 2 Slide Files which are a hard plastic. One of them was sitting on a painted steel shelf and I found some oozing degradation components that were oily/greasy and rust where the paint on the shelf was scratched (probably prior to the box being placed on it).

These boxes have bubbled to the top of the priority list. The interior and slides seem to be fine…for now, and the other boxes are showing little or none of the symptoms of the one (which is probably not the oldest). The slides in this box date from 1983, but the box is almost certainly older. The Logan and Brumberger steel files are, as expected, holding up well, but I am migrating the images to hanging slide sheets from Transparent Office Products. I suspect that I’ll end up with about 2,500 sheets with probably 16 slides/sheet on average…and that will fit in seven file cabinet drawers (2′ deep). These sheets were originally sold by Franklin Distributors until Transparent took them over about half a decade ago. I bought my first sheets from them in 1991 or 1992 and they are still doing fine. Some other alleged to be archival sheets from the same time did not do as well.

We are scanning all of the images as we move them using a Nikon Coolscan 5000ED with SF-210 slide feeder.

2011-05-31

Watch those insects!

Filed under: -general,archival practices — Richard L. Hess @ 19:46

OK, this is not directly related to audio, but three audio people I know have been bitten by insects this spring and have suffered greatly for it. One was bitten by a spider in California, one almost died from a flea bite in Texas, and another received a suspected spider bite in Pennsylvania…so be careful…you never know where nasty insects might be hiding…maybe even under a tape box!

If you are worried about what to do, a friend, though a staunch vegan, squashes spiders. Of course, certain spiders are good and eat other insects, so this is just another one of those tough decisions in life.

And then there is mold. A good friend’s life was cut short by interaction with mold, though he was a smoker much of his life, so I’m certain that contributed to it.

As my Dad used to say, “you don’t get out of this life alive”, but he made a good run for it, living until age 93!

2011-05-30

Update (2012-08) Kyread spray-on magnetic viewer fluid

Filed under: magnetic record viewing,magnetic tape developing,tools — Richard L. Hess @ 11:41

In several articles on magnetic viewers, we have discussed the spray-on Kyread product.

GOOD NEWS! The company is back! I received a phone call from Ryan Blackwell this afternoon and he pointed me to their new website. The company name is now Kyros Technologies LLC.

Note their jump into the 21st century with a real website and great domain name: magneticdeveloper.com — they even have a shopping cart for online ordering. This is apparently the same product I’ve been using for the last eight years.

2011-04-14

Update to magnetic viewer accessories

Filed under: magnetic record viewing,magnetic tape developing,tools — Richard L. Hess @ 11:16

I remain a fan of the Sigma MV-95 magnetic viewer despite its slowness at times. I discussed it at length here in June of 2007. It has helped analyze many problematic tapes and has helped me understand the issues enough to apply the correct solution to transfer damaged tapes.

An example is here. (more…)

2011-03-05

Lighter edge-shedding another possible degradation modality

Filed under: project notes,Tape Aging — Richard L. Hess @ 11:51

We have seen some tapes which cannot be baked and others that did not need baking and could be treated in an easier way. Our degrading tapes page has been updated with a section on Lighter edge-shedding. This also includes a description of a simple tape-wiping process.

2011-02-17

Updates posted for “winding tapes for long-term storage”

Filed under: archival practices,reels,storage-care-handling,Tape Aging,video — Richard L. Hess @ 09:49

There was yet another discussion about winding tapes for long term storage. This time it was on the Society of American Archivists list. While it was focused on VHS tapes, where it was decided that it was more important not to leave the tape in the middle with active content exposed, some discussions of the mechanics arose and I have added them as comments to the original post, which is available here.

2010-10-08

IASA TC04 Guidelines on the Production and Preservation of Digital Audio Objects available online.

The International Association of Sound and Audiovisual Archives (IASA) has released their landmark Guidelines on the Production and Preservation of Digital Audio Objects as a free web (HTML) edition, available here.

I provided some information for the listing of tape equalizations, and I find the compiled table (here) most useful.

Thanks to Kevin Bradley and the IASA team for their work in making this available. If you want a PDF copy, join IASA and it’s available.

Cassette equalization redo

Filed under: cassettes,history,Tape Aging — Richard L. Hess @ 17:25

There has been much discussion on some web fora about the differences between different brands’ cassette equalization standards.

As I stated here in 2006, there is a 4 dB ambiguity at 16 kHz.

Many things conspire to make this 4 dB ambiguity essentially meaningless in a generally low-fi medium. The only reason I’m mentioning this now is that I’ve been bombarded with email from more than one participant in this discussion and apparently there may be some editorial judgment attached to what is posted.

Jay McKnight has graciously permitted my posting of his comments to me: (more…)

2010-04-27

End of the 3.5″ floppy disk

Filed under: archive operations — Richard L. Hess @ 16:31

CNET reported yesterday that Sony will be stopping sales of its 3.5-inch floppy disk media in March 2011 in Japan. Apple stopped supplying these as standard equipment in 1998 and Dell ceased that practice in 2003.

While this medium is not widely used for audio or video, there is, I suspect, still a large amount of ancillary data kept in this format. I will look through my collection and see if there is anything else I need to capture to my servers before my drives die.  I would not entrust anything important to this format.

We stopped using these about three or four years ago, with the last holdout being school work brought home. Now, even that is done on USB keys.

2010-02-20

Compander-type Noise Reduction Systems

Filed under: archive operations,audio,history,project notes — Richard L. Hess @ 01:24

Note: This information has been incorporated into this page which contains a more in-depth discussion.

I received an urgent phone call yesterday from a man who had digitized several reels of 2″ 24-track analog recordings that he wished to re-mix.

The tapes were originally recorded in about 1978-1979 and he said that he needed them to have Dolby C noise-reduction processing applied to the files.

I did a bit of research, as that did not sound correct from an historic point of view.

Here is an approximate chronology of the major noise-reduction systems and their dates of introduction: (more…)

2009-10-21

Long-term stability of different batches of Ampex 456 – a guest article by Gary Galo

Filed under: reels,Tape Aging — Gary Galo @ 15:14

Here’s some info that might be useful concerning which batches of Ampex 456 are good and which have sticky shed problems.

I recently unearthed 26 brand new 10 1/2-inch reels of 456 from 8 different batches. I checked one reel from each batch by playing them back and forth at 15ips (I only played the bad reels in one direction – that was enough!). The following batches were bad:

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2009-09-02

Dangers of old tape recorders for playback; using the elevator head

We are currently working on some un-published tapes for a major Canadian folk artist. We have a 7.5 in/s 2-track stereo recording that was one of (if not the) first studio recording of this artist from circa 1972.

At some point, this tape was played on a 1/4-track machine that injected hum onto the left channel. Here’s what the magnetic viewer showed:

hum_overwrite_dsc_0571

(more…)

2009-07-17

40th Anniversary of Apollo 11 Moonwalk and the loss of data

Filed under: archival practices,data storage,history,oral history,video — Richard L. Hess @ 13:50

There has been much discussion over the last few years about finding and saving original tapes of the Apollo 11 Moonwalk videos downlinked from the moon. There is also an exciting project going on to restore and digitize the Lunar Orbiter tapes from more than 40 years ago.

The Lunar Orbiter tape digitization folks have just posted a commentary that bears reading by all archivists who are holding tapes. You may link to it here. The main site is www.moonviews.com

NASA, in their press conference yesterday held at The Newseum, admitted that the original 14-track 1-inch instrumentation (IRIG) tapes that contained the slow-scan video direct from the moon were most likely recycled and reused for later missions. Apparently, over 350,000 reels of instrumentation tape were recycled by NASA over time. No one apparently thought to preserve the 45-odd reels of the original moon walk. (more…)

2009-04-13

Zoom H2 line input

The Zoom H2 HandyCorder is perhaps the lowest-cost digital recorder on the market that provides reasonable and useful results. While I have a Sound Devices 722 for my more serious work, I bought the Zoom to test it out to see if it could be part of a simple tape digitization system for archives on a budget who wish to do the work themselves. It does this reasonably well.

As with much equipment–and especially with lower-cost equipment–the performance specifications and the actual operational data is not published. There are reports of the H2 clipping on the line inputs in some of the reviews and it appears that a lack of understanding how the inputs were configured exacerbated that situation.

There is nothing wrong with the line inputs on the H2. BUT there are some caveats: (more…)

2009-04-07

Kodak Durol triacetate tape with bad vinegar syndrome

Filed under: project notes,Studer A807,Tape Aging — Richard L. Hess @ 15:40

I recently received two 7-inch reels of Kodak Type 31A Triacetate tape (1250 feet, Durol Base) that smelled of vinegar even before I got the envelope open.

These tapes were badly warped due, most likely, to the vinegar-syndrome induced differential shrinkage. Other factors may have been poor winding during long-term storage (I had received them after several attempts to play them on another machine). (more…)

2009-02-04

Images of Scotch (3M) tape boxes available

Filed under: history,reels,Tape Aging — Richard L. Hess @ 23:24

I was interested in the progression of the Scotch/3M tape boxes over the years, especially after someone contacted me because his father was in the picture on some of the 1960s tape boxes.

(more…)

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