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|  MIL-O-81151A(OS)
to perform the quality conformance tests set forth in this specification.
Ballantine Model 303 or Model 300G, or equal,
4,4.3.1 Voltmeter.
4.4.3.2 Counting, timing and frequency measuring meter. Universal
EPUT and Timer, Model 7360, or equal.
4.4.3.3 Cathode-ray oscilloscope. OS-48/U.
4.4.3.4 Wave analyzer. TS-615/U.
4.4.3.5 Insulation tester.
Radio Frequency Laboratories 184c.
MOD NMD/Y.
4.4.3.6 Dielectric tester.
4.4,3.7 Power supply. A power supply that will furnish the power
specified as follows. The power supply shall have filament power and
plate power switches in the output circuits of the test circuit (see
Figure 1).
4.4.3.7.1 Heater power. The electrical power which is used to operate
the 6C4WA in the oscillator test circuit shall meet the following require-
ments. All values shall be measured at the power supply output terminals.
(a) No-load voltage. With no load the voltage shall not exceed
minus 7.5 volts direct current (vdc).
(b) Current.
The heater will require a current of 0.15 ampere.
(c) Voltage. Under a load current of 0.15 ampere, the voltage
shall be minus 6.25 plus or minus 0.10 vdc.
(d) Internal impedance. The impedance which the power source pre-
sents to the heater at a load current of 0.15 ampere shall not exceed 50
ohms at 1 KHz,
(e) Alternating-current (ac) voltage components. Under a load cur-
rent of 0.15 ampere, the ac voltage components shall not exceed the following:
(1) 30 Hertz (Hz) to 150 kilohertz (KHz) ----0.09 volt root-mean-
square (vrms).
(2) 0.9 KHz to 1.1 KHz----9O microvolt rms
4.4.3.7.2 Plate power. The electrical power required to operate the
6C4WA plate in the oscillator subassembly test circuit shall meet the
following requirements. All values specified shall be measured at the
power supply output terminals.
(a) No-load voltage.
With no load the voltage shall not exceed
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