Quote:
Originally posted by Jedi
....I've been told that the oxide coatings often flake off on tapes that are more than 20 years old. Any experience on this? |
As stated above, this is all relative to the tape stock that was originally used and the care that was taken to storing the tape. "Getting it off" onto another medium (implication is record it off to digital) isn't the solution either as the longevity of digital based media is questionable as well (CD-Rs aren't an archival medium... and will degrade after several years). There is of course the other argument that moving the analog media to digital will be a degradation. That being said, the shelf life of a well cared for tape is considered to be longer than just about anything else. I have 50 year old tapes that still sound fantastic.
Now as far as known problems with tape... some tape stock will develop a high degree of shedding. This is usually older acetate based tape and great care must be taken whenever handling acetate tape. Acetate tape should be wound off using only play speeds and not high speed winding. Transports that are rough on tape will surely destroy an older acetate tape.
The other major problem that has been encountered with analog tape is what is called sticky tape. This occurs when the binder in the tape absorbs a certain degree of moisture and becomes "sticky". When playing a sticky tape through a machine, it will grind the machine to a halt and cause the tape to both shed and stretch. While sticky tape cannot be permanently reversed, you can temporarily reverse the problem so that the tape can be played a few times. This is done by slow baking the tape in a convection oven at controlled temperature over several hours (don't use a normal kitchen oven for this... their temperature fluctuations are too great and can destroy the tape). The worst offender of sticky tape was Ampex 406/456 manufactured in the mid 70s to the mid 80s.
The last problem (which is fairly infrequent) is a lubrication breakdown of the tape... if your tape is covered in white powder, then you have a lubrication breakdown. Fixing this requires cleaning and relubricating the tape... a major pain in the ass and generally not worth it unless the tape is a 1 of a kind recording.