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The primary amplifier can be either a 2 or 3 valve unit, which builds up a very weak signal.
The output of the primary amplifier is taken through a delicate attenuator system on to this device on the wall,
called the fader. The fader is actually a double potentiometer, each machine being connected to it, and in
effect is the master volume control.

From n,ere tne signal goes to the main amplifier where it Is amplified many many times, and is then ready to
commence its' journey to the stage speakers which are mounted behind the perforated screen; we are then
able to hear what is being played or said in conjunction with the image on the screen.
Now. that's the process of sound on film, and in nearly every essential, the sound on disc method is similar,
except in the primary stages of amplification.

The baize topped disc, at the rear of the projector is the VITAPHONE turntable. Vitaphone is an exclusive
trade name, but all sound on disc systems have become known as Vitaphone.
The record at first glance seems very similar to an oversize gramophone record, but it differs considerably in
its' action. First of all, it travels at only 33 1/3 rpm instead of 78, as normal records play at.
Again it differs, in that the needle is placed on a start mark on the inside of the record, the pickup moving
towards the outer edge. The output from the pickup is then fed into the main amplifier, by passing the 2 or 3
valve amplifier, as the output, puts out a much higher signal than the photo electric cell, it then proceeds on its'
way to the stage speakers.

With this knowledge we thank, and bid, the operator farewell and leave the blo box.

THE COURIER, Ballarat, Sunday, September 24, 1994 Page 3

By FIONA HENElERSON schoolS, performing art groups ·Sturt Cinema will have
or those looldng for smaller, com:J?uterJsed ticketlng, a foo'a
Ballar,at's Vegas Theatre cheaper venues.
is to b_e :~rans{ormed into a bar !ind a giant screen.
second. cin!3ina complex. The ,theatre, in Sturt St, It will t•un six days n week,
which was the Odeon before it with-two evening sessions and
The:JSturt 'qinema will open becam~ . tll_e Vegas, has oeen nomp:tated matinees. ·
on T.uP§day, screening both refuil5.islied, .with seats ob-
mafn-sti·ealfi a.n<Jfine a.t•t films. : Fo!' the ffrst·week. no ticket
- tained· from the famous 'Rivoli _prices will be above $5.
Manag:er :Qanny Houlihan Theatre. ·
said the:-new cinema would al- . For it's opening few weekS,
Erqjection equipment was Sturt Cinema wtll screen Tnar
low more films to be ecreened set·u~ yesterday, ready for next Lies, Speed, Four Weddings ana-a:
in Eallar~t for a longer time.
week'~ opening. Funeral and Monkey Trouble.
"It will give access to 1nore
product in Ballarat,'' he sa.id. .-:up-~arker; films will have · world of Magic will also per-
the dpportu.nity to run longer,, . form there in November.
. The complex's upper lobby Mr Houlihan said . .. It will put a· "People will have morP. of a
will also be available for bit of life back into Sturt St." choice now," Mr Houliha11 said.

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