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Arriflex 16 S

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Your motor is the basic Arri 16 S / 16 M Governor Controlled motor that was modified to output a 1 volt sync pulse/signal that was fed to a 1/4 inch synchronous tape recorder. One would plug the sync cable (umbilical cord, as it was called) from the recorder into the single pin RCA jack located on the back of the motor next to the knurled turning knob. Any minor speed variations or fluctuations of the camera would be recorded on the ¼ inch tape.

With this motor you could then shoot lip-sync sound with your noisy Arri 16 S (with additional sound coming from the 400 ft torque motor) or M camera (well, maybe the camera was in that user friendly ‘blimp’). You wouldn’t need an A.C. power supply or the Arri a.c. sync motor for sync filming. The camera was driven by batteries and same for the recorder. 

“Governor controlled motor for 8 V battery operation with fixed camera speed of 24 (Cat. No. 1161) or 25 frames per second (Cat. No. 1162). This speed is automatically maintained and cannot be changed. The speed required should be stated when placing an order. Other speeds can be adjusted on request. This motor is designed for forward drive only, and a knurled knob for turning the camera mechanism by hand is also provided.”

Most likely the speed of your motor is 24 fps. You can always check the speed of the motor on the camera with a strobe light.

The motor used for this modification was the early Arri Governor Controlled motor. This was the one without the transistor attached to it. I would guess your motor is from the early to late 1960s.

The sync pulse modification did not change the operation of the motor. 

So, now you have a constant speed motor (24 fps) for your 16 S camera.

This motor was modified by Magnetic Sales Corp, an equipment division of Loren Ryder’s ‘Ryder Sound Services, Inc’ at the same address.

Loren Ryder started his business in 1948. He was an early pioneer in magnetic sound recording for Motion Pictures, initially working for Paramount. He became a leader in the industry for portable magnetic recording on location.  https://en.wikipedia.org/wiki/Loren_L._Ryder   There is a nice article about him in the May 1973 American Cinematographer.



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This is great information, now if I can find a portable ¼" tape recorder that will work with this motor

Thanks , Michael Leake

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