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Topic: eiki projectors
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John Whittle
Jedi Master Film Handler
Posts: 791
From: Northridge, CA USA
Registered: Jun 2003
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posted January 17, 2010 12:22 PM
One other note on early Eiki Projectors. The MS series and the ST/M series used windings on the motor to supply the reduced AC voltages to the Amp. The problem with this is that changes on the motor load will change the voltage. The RT and later series (as long as they use the low voltage lamp) have a transformer that supplies the Lamp current and Amp voltages for the amp and exciter lamp.
Also the amps in the RT series and later have a much better controlled DC supply for the exciter lamp. (A slight load on the MS/ST series on the motor decreased the AC to the exciter lamp which decreased the lamp output and lowers the sound level).
If you can, try and find the amps without the big all integrated power module. When these fail, they aren't repairable, just replace. The later amps went back to descrete components and can be repaired.
The last models, the SSN and SSL have a much improved design and are by far the best.
As for the cam tank, the oil on the felt is used to slowly wip the cam plate to provide lubrication. On the RT and later machines, the claw lever has a nylon or plastic bearing surface for both the up and down and in and out movement and last much longer than the earlier design.
The ST and earlier cam tanks are virtual copies of the RCA 400 with metal spring steel top and bottom moving the claw up and down on a mircata cam, the in and out are on a steel stamped plate with a nylon/plastic bushing.
In all these machines, as the in out bushing wears, the claw actually increases it's protrusion into the film. Wear on the RT/M and later up and down bushing will only slightly change the framing.
Eiki changed from the mircata cam to a cast steel cam when the man who made all the cams at the Eiki factory died (this happend with the introduction of the RT/M Royal Series). They took several examples of his last work and then cast them for future projectors. Up to that time, every cam had been hand cut and finished by that one expert employee.
John
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