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you may wish to contact Ron J Lutsock or  Jim R Feehrmeyer at the Ballantyne company..
They have been mfg projectors and  sound heads since the 30s.. and are still in business.
Check out their web site if your not familiar with them. 
dnward


--- On Sun, 9/28/08, Michael Biel <[log in to unmask]> wrote:

> From: Michael Biel <[log in to unmask]>
> Subject: Re: [ARSCLIST] motion picture amps (optical sound)
> To: [log in to unmask]
> Date: Sunday, September 28, 2008, 2:40 PM
> Jack Honeycutt wrote:
> > It is a long shot, but I thought I would toss this out
> in case we have 
> > any motion picture sound folks here.  I am looking for
> a schematic of 
> > the RCA PA-94 amp.  I am also looking for the amp,
> galvo, microphone, 
> > cables etc..  If anyone knows where I might find this
> hardware, please 
> > let me know.
> >  
> 
> There is a possibility that the schematic might be
> available thru the 
> Smithsonian.  Back in the 70s they received a collection of
> every piece 
> of printed material that RCA printed during that era from a
> long-time 
> RCA employee.  Elliot Sivovich showed it to me, and it even
> had things 
> as arcane as the tags tied onto power cords. 
> 
> Mike Biel    [log in to unmask]