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MANAGERS AND PROJECTIONISTS 1347
In plate circuit VI we find a resistance. Should this burn out or become otherwise defective, break its connection with the socket and break the plate connection to No. 2 terminal at the top of the amplifier. Attach the wire from No. 2 terminal to the plate terminal on socket VI, which cuts out the resistance and V2.
If the input transformer is at fault, disconnect the wires from lugs 2 and 5 at the top of the amplifier. Solder the wire which attached to lug 5 to lug No. 2, which cuts out the input transformer and V3, after which V2 should have an altered grid bias. This is remedied by disconnecting the wire connecting terminal No. 7 on the output transformer and the 90-volt terminal on the strip just below it. Disconnect it from the 90-volt terminal and attach it to the 45-volt terminal. If you have sufficient amplification thus, all right. If not, remake the connection as it was before, and run that way until a replacement can be obtained.
WHEN AN OUTPUT TRANSFORMER GOES BAD. — In such a case, with no transformer with which to replace it, the only really practical recourse is to use the transformer on the other projector. This may be done in either of two ways.
The first way is to use the photo-electric cell only, on the amplifier that is out of commission, conducting the signal from here to the PEC amplifier of the other projector. Disconnect the lead from the photo-electric cell of both projectors. Secure a double throw switch of any sort. Connect the good binding post of the good amplifier which formerly connected to the photoelectric cell to the center binding post of the switch blade, if it be a single-pole switch — or to the center