MIL-PRF-1/1120G
C: 1 µF ± 10 %, 1,000 V dc
R1: 500 ohms ± 10 %, 10 W
R2: 1,000 ohms ± 10 %, 50 W , variable
V1: 0 to 400 V ac
V2: 0 to 10 V ac
A1: 0 to 150 mA dc
Test procedure:
1. Remove tube from preheat rack and place in test socket.
2. Check heater voltage at V2 (6.0 V ac) and grid voltage at V1 (285 V ac).
3. Press pushbutton switch, applying voltage between grid and cathode. Pushbutton switch is normally open.
4. Adjust R2 to 100 mA dc on A1 if necessary.
5. Hold pushbutton switch closed for at least 10 seconds. Tube shall be rejected if current drops to zero or
fluctuates and continuous arcing occurs.
FIGURE 2. Grid arc test set wiring diagram.
FIGURE 3. 5 kHz life-test circuit. Component tolerances ± 10 % or better.
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