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Topic: 4 Track Mag sound
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John Wilson
Film God
Posts: 5438
From: Sydney, Australia.
Registered: Dec 1999
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posted 07-09-2000 01:47 AM
>>I have all of the test film for 4-track, now to find some prints.<<...which may prove difficult. We've got (although I'm not sure it still exists) a near mint 35mm print of The Blues Brothers in four track available to us here but there's not a lot of money left in that one anymore. You may get some from collectors, but... I ran a mag/opt print of Empire Strikes Back in 1983. The reel lengths were still the same as an optical print, but anyone remembering that title will recall it was 119 minutes long on six reels (nothing today, but in those days, those made for some pretty big reels of film). Now add to those already full reels a mag track and each 2000 went over the rim by about 1/2 an inch! Fun, fun, fun...
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John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
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posted 07-10-2000 06:35 AM
Unless stored properly, magnetic tracks on triacetate prints made them more prone to "vinegar syndrome". Iron (rusted cans or reels, magnetic stripe) serves as a catalyst for the hydrolysis reaction. The binders used for magnetic tracks were also prone to hydrolysis.If you have striped prints that are still in good condition, you should continue to store them in cool and dry conditions. Unsealed containers allow venting of the acid by-products, so the acid won't build up. If sealed containers are used, Molecular Sieves will adsorb both moisture and acid, retarding "vinegar syndrome". See SMPTE Recommended Practice RP131 "Storage of Motion Picture Films" or Kodak's publication H-23 "The Book of Film Care":
http://www.kodak.com/US/en/motion/support/technical/care.shtml ------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Eastman Kodak Company
Research Labs, Building 69, Room 7419
Rochester, New York, 14650-1922 USA
Tel: 716-477-5325 Fax: 716-722-7243
E-Mail: john.pytlak@kodak.com
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Rick Long
Jedi Master Film Handler
Posts: 759
From: Toronto, Ontario, Canada
Registered: Nov 1999
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posted 07-11-2000 04:04 PM
In the last couple of dozen years, the only 4-track prints that I have run are:
The Song Remains The Same - Led Zepplin
The Buddy Holly Story
The Slipper and the Rose
Earthquake (4th track used to trigger the Sensurround equipment)
The Rose Many 35MM mag prints had a 12 kHz tone to switch in the surround track (better described as an "effects" track) whenever surround effects were desired. Unlike Dolby stereo recordings, this track was only used to enhance dramatic screen action. (the bells of the abbey in Sound of Music, a roll of thunder in King of Kings, ect.). If your M.P.U. does not have a 12 kHz filter, you may hear (actually more feel, than hear) an annoying high-frequency whistle from the surrounds. You may end up spending a lot of time with high-Q (notch) filters trying to get around this problem. It all depends on the print. Good luck!
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