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1354 HANDBOOK OF PROJECTION FOR
replace the transformer or cut out one stage of amplification.
We still have the question of low volume and distortion due to the PEC amplifier, but we have discussed almost all causes of these two troubles when treating of a dead amplifier. Oil soaked wire sets up what seems to be a very mysterious volume loss. Should you suspect this, have the service engineer test the condition of the wiring. When you call him, if you do, advise him as to what is wanted as he must fetch a suitable testing meter.
The disc equalizer itself should give no trouble. The device consists of a resistance, an inductance and a capacity. An open circuit in the equalizer or in the associated wiring will produce the same result as cutting out the equalizer, which is what really happens. This only causes a greater amount of surface noise to come through, but will otherwise not affect the show.
A ground occurring in the equalizer will either cause a loss of volume or completely kill the sound, depending on where the ground occurs and on what terminal of the equalizer is connected to the system. No. 4 terminal is always connected and is also grounded through the fader. This must be kept in mind during the testing, unless the wire is removed from terminal No. 4, but there is no need for doing this. If the condenser becomes shorted, it grounds the lower end of the inductance.
A ground in the wiring to the equalizer kills all the sound. Complete loss of sound due to grounds in the wiring or in the equalizer is easy to diagnose. A test at the reproducer with a pair of phones will show no sound to be present. Disconnect the reproducer and