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MANAGERS AND PROJECTIONISTS 1339
but it is a poor makeshift at best. There are other makeshifts, but we do not care to advise how to do a thing wrongly, even to "get by." "Get by" by having proper spare parts, and thus do the job right.
WARNING. — In using a battery and buzzer or a battery and voltmeter for testing, never attempt to pass the battery current through any transformer windings except those which normally carry plate current. The reason for this warning is that some transformer windings are not designed to carry direct current, and the magnetic characteristics of the transformer may be upset if direct current is passed through them. Also remember that the resistance of most amplifier transformer windings is very much too high for a buzzer to operate in series with them, and that if a voltmeter be operated in series with such a winding, the high resistance may and probably will prevent the meter from registering the full battery voltage.
KEEP DIAGRAM BEFORE YOU.— When testing, the projectionist should always keep the wiring diagram of the apparatus before him. Remember that if you have removed the PEC amplifier from the projector, then while it is out it does not conform to wmat is shown in the wiring diagram for the reason that the two transformers remain attached to the projector, which has an effect upon plate circuits V2 and V3, as well as the grid circuit V3. For this reason all possible tests should be made before removing the amplifier, since thus you may determine whether the seat of trouble is in the external circuits or in the amplifier itself.
Should you find the trouble to be in the amplifier, you had better proceed wdth the testing until the circuit in