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Re: [ARSCLIST] Capstanless ATRs (was Quarter-inch splicing tabs)
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.
He is also mentioned in the AES history of American Tape Recording:
Also one of his legendary 1" cutting/splicing blocks is on sale on eBay:
Needless to say, there is a bit of family pride in his accomplishments
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.<snip>
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.
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