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MANAGERS AND PROJECTIONISTS 1147
(g) a 12 to 1 transformer; (h) a fader; (i) a 1 to 12 transformer; (j) a volume control; (k) various stages of amplification, and (m) loud speakers.
The amplifying circuit consists of three stages of pushpull voltage amplification. UX-210 RCA tubes are used, feeding an output stage of push-pull amplification through UX-250 or UX-845 tubes.
The amplified current finally passes through an output transformer and into the moving-coil cone loud speakers, by which sound is projected into the theatre auditorium.
INTERCHANGEABILITY.— RCA Photophone films may be projected with Western Electric apparatus, and variable density (movietone) films may be projected with RCA Photophone apparatus. In fact, at present at least, this is the case with all film carrying the sound record upon it. They may all be used with all sound apparatus designed for reproduction and projection, the sound track location on the film and distance from projector and sound aperture being standardized, the latter at 14}4 inches.
DISC RECORD REPRODUCTION.— RCA Photo phone supplies an attachment for the reproduction of sound from disc records. This apparatus is geared to run at the standard film-disc speed of thirty-three and one-third (33^) revolutions for each ninety (90) feet of film passing the projector aperture. Its operation is essentially the same as that of the one described in pages 1109 to 1113. In this connection you are referred to the matter appearing under "Using Disc Reproducing Apparatus/' pages 1171 to 1181.
A change may be made from film to disc reproduction, or vice versa, merely by throwing a single switch, located