You might have to wait till later this week.
I only work weekends(granted there's not a track meet), but I'll get those numbers to you .

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Mag is short for magnetic recording. It was the first form of surround sound with all channels discrete on the film. And until recently, it was the only soundtrack on 70mm film. basically, four strips of magnetic tape were glued somehow onto the film. 35mm film can hold 4 tracks of audio, but 70mm can hold 6. I'll try and find a picture for you,

Check out the early history of "Scope", which included 4-track magnetic striped prints, on Marty Hart's "American WideScreen Museum" website:
http://www.simplecom.net/widefilm/widescreen/wingcs1.htm
http://www.simplecom.net/widefilm/widescreen/cinemascoperef.htm

The main site entry link is:
http://www.simplecom.net/widefilm/

IMHO, Marty's site is one of the most facinating and comprehensive sites about motion picture technology on the web.

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I just couldn't stand it any longer, so I finally registered on the Film-Tech forum after reading and enjoying it so very much. There is only so much time in a day, and finding time to read, much less respond, is difficult.

I will go out on a limb here and TRY to remember a bit about the SMP435 EQ. As I recall, the original 435 only had 2 eq adjustments, and when Indiana Jones and the Temple of Doom (I think it was)came out in 70 mag, the eq standards were changed somehow. I don't recall the details. This was back in 1985 I think or somewhere around then. We modified the eq circuits and added a third adjustment.

I recall running pink noise film on Teccon 70 mag heads and we were able to get pretty darn good response for Indiana Jones. I don't recall exactly what the response was, but it seems like it was reasonably flat up to 16kHz or so, maybe plus/minus 2 or 3 db. Not perfect by any stretch, but certainly not bad.

We had this set up at the Belle Meade theatre in Nashville, and it sounded fantastic. Clean, smooth, and quiet!

The old 435's may not have been the best preamps money could buy, but for the price they offered a great value, and we sold a great number of them.

Regarding high Z heads, they were not suitable.

Thanks for letting me join in here!

------------------
Oscar Neundorfer
Chief Engineer
SMART Devices, Inc.

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does someone have the schematics for these?

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"River Kwai" was here in a 3-track-only mag print (no surround). Was that the normal version, or did it excist in regular 4-track ? -And if, - then why this amputated one ??

-Likewise: Both danish prints of "JCSuperstar" were without surround, -but those 3 remaining tracks sounded damned well.
Anyone tryed the Dolby Stereo reissue prints (late 80'es) of this one - were they any good...??

I do use both soap and toothpaste, but i'd got to admit, i'd never heard of Film Guard before getting into this great forum, and therefore, i do not use that - yet (!)

Maybe that why i feel, nobody wants to answer my questions on this topic...
Very sad, very alone in the booth, very uninformed

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