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OPERATING MANUAL 153
NUMBER MATERIAL LOCATION
10 UX-845 Radiotron Ten sockets in the power amplification section of the amplifier 2 PJ-15 Photo-cell One in the photo-cell housing
on each reproducer 4 Projector prefo Two in the lamp sockets of the cussed lamps optical system housing on (M-3626287-G2) each projector reproducer
2 No. 2370 Burgess Voltage amplification section
Battery of the amplifier
I No. 4156 Burgess Voltage amplification section Battery of the amplifier
When it is necessary to remove the metal covers on the back of the amplifiers to inspect internal wiring, replace the tubes and the fuses. When work is required on the motor generator set, it is always advisable to shut it down.
I. PROJECTOR AND REPRODUCER PREPARATION
When sound film is being projected it is necessary to mask the sound track. Therefore be sure to have the correct aperture plate in position before starting. Always check the optical system before the projector is started. It is advisable to use a 2,000-foot reel with a hub diameter of five inches for the take-up reel. After threading the projector mechanism, run a few feet of film through to see that the film is tracking properly.
II. PREPARATION OF AMPLIFIER
Make sure both lamp rheostats have all their resistance cut in. Push the "Start" button on the switch marked "Amplifier, Plate and Filament Generator." A red pilot lamp beside this switch will indicate that the motorgenerator set is running. Throw the switch marked "Charge Battery." Throw both switches on the input panel to the "On" position. Insert one of the instrument