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| MIL-T-81148B(OS)
Current: The heater will require a current of 0.3 ampere.
4.5.3.7.1.2
4.5.3.7.1.3 Voltage: Under a load current of 0.3 ampere, the voltage
shall be minus 6.25 plus or minus 0.10 vdc.
4.5.3.7.1.4 Internal impedance: The impedance which the power source
presents to the filament at a load current of 0.3 ampere shall not exceed
400 ohms at 7 kiloHertz (kHz)
4.5.3 .7.1.5 Alternating current voltage components: Under a load cur-
rent of 0.3 ampere, the alternating current (ac) voltage components shall
not exceed the following:
0.09 volt root mean square (vrms)
30 Hz to 150 kHz
6.0 kHz to 8.0 kHz
20 microvolts rms
4.5.3.7.2 Plate power: The electrical power which is used to supply
the 6AU6WB plate voltage in the transformer test circuit shall meet the
following requirements. All values specified shall be measured at the
power supply terminals
4.5.3.7.2.1 No load voltage: With no load, the voltage shall not ex-
teed 165 vdc.
4.5.3.7.2.2 Current: The test circuit will require a current of 10
milliamperes (ma).
4.5.3 .7.2.3 Voltage: Under a load current of 10 ma, the voltage shall
be 150 plus or minus 1 tic.
4.5.3.7.2.4 Internal impedance: The impedance which the power source
presents to the test circuit at a load current of 10 ma shall not exceed
5 ohms at 7 kHz.
4.5.3 .7.2.5 Alternating current voltage components: Under a load
current of 10 ma, the ac voltage components shall not exceed the fol-
lowing :
30 Hz to 150 kHz
0.2 vrms
6 kHz to 8 kHz
200 microvolts rms
4.5.3.8 Electron tube: MIL-E-1, JAN 6AU6WB.
4.5.3.9 Resistor: 150 ohms plus or minus 1 percent 1/2 W; MIL-R-10509
designation, RN65D1500F.
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