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vintage,
The specific converter for this application is the SCRF525M-SC. It was originally created at the request of John Folsom and Cliff Benhem to eliminate the electronics, and especially that nasty commutator in the original Col-R-Tel.
I don't have any specific advice on the mechanics or motor control. Cliff is the resident expert in this area. He has all the numbers for exactly what color filters are required and the motor controls he has used. Cliff is the guy who got the drum set working and donated it to the museum this year.
My avatar is an original RCA publicity picture showing a state of the art (at the time) 60 line mechanical image. I have recreated this on my mechanical sets and actually watched a few shows on them. It's not quite as bad as people might suspect.
Darryl
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