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162 SOUND MOTION PICTURES
low or is zero, probably a condenser has failed. A further indication of this state is that the plates of the rectifier tubes of the amplifier affected may begin to get red hot. Turn off the power on this amplifier, by means of the amplifier starting switch. Locate the defective condenser as follows :
Remove the front cover of the amplifier. The condensers are connected in parallel in two groups, the first containing C-2 to C-io inclusive; and the second, C-n to C-19 inclusive. Unsolder the connection coming from behind the panel to the lower terminal of C-2. Turn the amplifier starting switch to "Plate." If the plate meter reading is now normal it shows that the bad condenser is in the C-2 to C-10 group. Shut off the switch. Restore the connection on C-2 and unsolder the connection between C-2 and C-3. Turn on the switch. If the meter reading is still normal, it shows that C-2 is good and that the bad condenser is in the C-3 to C-10 group. Restore the connection on C-3, and unsolder the connection between C-3 and C-4; test again with the switch and the meter, until a condenser is found which, when connected, causes the meter reading to fall. This one will be the bad condenser. Cut it out by connecting the lower terminals of the two adjoining condensers directly instead of through the lower terminal of the defective condenser. If, in the first place, when the connection coming from behind the panel is unsoldered from the lower terminal of C-2, the meter reading is not brought to normal, the defective condenser is in the C-n to C-19 group. Then restore the connection on C-2, unsolder the connection between C-n and C-12, and test for a defective condenser, as already described for the C-2 to C-10 group. 9. If all fuses are in good condition and all current and voltage readings normal, probably there is a ground, open circuit, or a short circuit somewhere in the system. Try to locate the fault with the headset. Possibly