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How efficient and durable are these projectors??? I was told they were installed in the 70s and they are run by simplex motors and RCA photophonic head unit ??? Is it easy to get parts for them and what should be the main thing to be aware of using this type of system ??? Thx

xetron per se did not ever make a projector
they rebranded and distributed during there ongoing lifespan cinemecanica century prevost and ernemann all of which parts are available for
You refer to RCA and simplex motors well
I think you probably have a xetron lamphouse with a rca soundhead and simplex projector
but that could be wrong much like the numerous calls regarding theatres with peerless projectors

I would sujest you get your facts togather and if you are not familiar with what is in a booth then hire a technician to determin what you have and what you need