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MANAGERS AND PROJECTIONISTS 1341
tightening these screws that they are not long enough to do this, as such a condition grounds the battery.
REPLACE BATTERIES.— Any battery testing as low as 40 to 42 volts should be immediately replaced. When this point is reached, a battery drops off very fast and you are taking needless risk in using it longer.
OPEN OR SHORT.— If the batteries and fuses test out O. K., then we may seek an open circuit, which will most likely be found at the terminals of either the battery box or the switch.
Having everything O. K. up to the 6-pole switch, with 45, 90 and 90 volts, or possibly one or two volts less, close the switch and test the voltage at each tube. Connect a wire from the 150-volt voltmeter terminal to ground and to the positive voltmeter terminal attach a wire, insulated of course, long enough to reach the parts to be tested.
Test each tube socket by placing the end of the test wire in contact writh the plate terminal of the socket. For VI, V2 and V3 the voltmeter readings should be approximately 10, 35 and 65, respectively.
NOTE. — These voltage readings were obtained with a Weston Model 280 voltmeter. The readings will be different with any voltmeter having different resistance, though the average meter will be found to have resistance practically equal with the Weston 280. Of course a high resistance voltmeter (1,000 ohms per volt) will read much higher. On the other hand, using one of the small pocket meters employed for testing dry batteries, et cetera, would result in no reading at all on the first tube, and very low ones on the other two. Such