A variation on this theme of feed drag and tension was the later
invention and use of servoed feed and take-up reels for capstanless tape
handling used on my brother's (John Stephens) analog multitrack ATRs
that are still in use by many engineers who prefer it for mastering.
Ampex later used a similar type of technique on one of their models
(John never patented his). His additional R&D has to do with upgrading
Bosch FDL60 Telecines.
http://stephensaudiovideo.com/
He is also mentioned in the AES history of American Tape Recording:
http://72.14.203.104/search?q=cache:21D8Xe9AHy4J:www.aes.org/aeshc/pdf/chronology.pdf+Stephens+Multitrack&hl=en&gl=us&ct=clnk&cd=20
Also one of his legendary 1" cutting/splicing blocks is on sale on eBay:
http://cgi.ebay.com/Ampex-Stephens-signed-Editall-2-inch-splice-blocks_W0QQitemZ7395867404QQcategoryZ15199QQtcZphotoQQssPageNameZWDVWQQrdZ1QQcmdZViewItem
Needless to say, there is a bit of family pride in his accomplishments
Rod Stephens
Family Theater Productions
Robert Hodge wrote:
>Ampex used an indirect drive on their first machines- Models 200 and 300. The fine speed adjustment for the capstan drive was accomplished by adding and subtracting the amount of drag applied to the rubber tire coupled through a flywheel to the capstan shaft. A minimum warm up time of 5 minutes was needed before any adjustment to the drive was attempted.
>
>A supplied strobe disc was used to determine the correct amount of drag.
>It must have been difficult to maintain speed consistancy between machines , using this method.
>
>No wonder later machines used the vastly superior direct capstan drive motor.
>
>Bob Hodge
>
>
>
>
>
>Robert Hodge,
>Senior Engineer
>Belfer Audio Archive
>Syracuse University
>222 Waverly Ave .
>Syracuse N.Y. 13244-2010
>
>315-443- 7971
>FAX-315-443-4866
>
>
>
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