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OPERATING MANUAL 121
that these tubes cannot be used for the amplifier after they have once been used for the rectifier. There is also provided on this panel a plate current meter — also a starting switch for the 42-A amplifier.)
43-A AMPLIFIER PANEL
(This amplifier has two Western Electric 211 type vacuum tubes used in the amplifier — also two Western Electric 211 type vacuum tubes used in the rectifier. A starting switch is also provided.)
VIII. Starting and Testing
1. synchronous pick-up mechanism
Each day, before the house opens, projectionists should test the horns individually, lubricate the projector and pick-up mechanism, and check the operation. Two or three records or sound films should be on hand for the purpose. Records of piano, violin, or orchestra selections are most suitable. It is furthermore desirable that two copies of each record or two prints of each film be used. After starting and testing the amplifier equipment the mechanism and horns may be tested as follows:
1. Turn off all theatre horns. If individual dial switches are provided for each horn, set the controls at zero, turning all the way to the right. Keep the monitor horn on with the control at the usual setting.
2. On the fader, set the pointer at zero.
If installation includes both film and disk reproduction, see that film-disk switching arrangement is set for the type of pick-up which is to be tested.
3. On each of the two machines which are to be used oil the universal joints on the shaft connecting the upper and lower combined disk and film and oil the following spots, which are all on the attachment mechanism.