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Author
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Topic: Need Help Identifying Part on Simplex SH-1007
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Jack Ondracek
Film God
Posts: 2348
From: Port Orchard, WA, USA
Registered: Oct 2002
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posted 07-20-2004 12:33 AM
You have pieces of Simplex optical and magnetic sound systems. I had that combination at a theatre in Washington... very good equipment.
The two small boxes are the magnetic changeover controls. You would push the appropriate button along with the visual douser control when switching from one projector to the other. I don't recall seeing the larger box with the two rotary controls... sorry.
The large rack in our installation was the OPTICAL amplifier system. Either amplifier (or both in parallel) could be switched to the center stage speaker, using the control at the bottom... instant redundancy.
There should be another rack around there... with 3 amplifiers and (I believe) a monitor amp of some kind. In magnetic mode, those 3 amps powered the stage speakers, and the optical rack ran the surrounds. You're also missing a box or two of pre-amp strips that usually are on the wall, close to the penthouse... and the surround control circuitry. You're also missing another push-button box that would switch the system between magnetic and optical. Also, there should be a couple of boxes with large volume controls and a toggle switch at the top. Those would be for optical volume and changeover. One would also have a selector for switching to a mic and record player. The turnkey XL booth I worked in also had an exciter supply that was mounted in a rack almost as large as the amplifer rack in your picture.
Your soundhead looks like the SH1012 models I use at my drive-in. That's the first time I've seen the pre-amp under the exciter lamp. My heads have always been empty (my wife says mine is, too!).
If you convert your sound head to red reader, you won't need the exciter & slit lens assembly, the photocell assembly or the pre-amp. You could leave the preamp module in there, I suppose... but it won't be something you'll ever use after the conversion. None of that stuff is involved when running magnetic, anyway. The speaker box in your picture would normally be for monitoring the optical sound rack... or surrounds, when in magnetic mode. We had a monitor for the mag amps that looked like a stage high-frequency horn, except it had 3 speakers mounted in it... something like 6" cones, I think.
Considering the age of that stuff, it all looks very nice!
As for whether you could use any of it in a digital mode... that's probably a matter of opinion. I don't think many people here would do it in a commercial environment... the amplifiers are very nice, but they're old and were never designed for the kind of dynamic range required for digital today. You'd have a challenge on your hands if something major blew... like any of the iron in there. But COULD you do it? Sure.
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