MIL-PRF-1/839F
TABLE I. Requirements - Continued.
Method of
Limits
Unit
MIL-STD-
Requirement or test
Notes
Conditions
Symbol
Min
Max
1311
Conformance
inspection, part 3
1506
Heater-cycling life
Ef = 7.5 V; Ehk = +100 V dc;
---
---
---
---
Ec1 = Ec2 = Eb = 0;
1 min "on", 4 min "off"
---
Heater-cycling life-test
end point:
µA dc
1336
Heater-cathode
Ihk
---
30
leakage
Ehk = +135 V dc; Rg1 = 0.1 MΩ
1516
Stability life
---
---
---
---
TA = room temperature
---
Stability life-test end
point (2 and 20 hours):
ĆSm
1306
Change in trans-
---
10
%
conductance (1) of
t
individual tubes
Ehk = +135 V dc; Rg1 = 0.1 MΩ
1501
Intermittent life
8
---
---
---
---
TE = 200°C (min)
---
Intermittent life-test end
points (1,000 hours):
µA dc
1266
Total grid current
Ic
0
-3.0
1301
Heater current
If
410
490
mA
ĆSm
1306
Change in transcon-
---
20
%
ductance (1) of
t
individual tubes
1341
Power output
Esig = 4.25 V ac; RL = 2,500 ohms
Po
0.50
---
W
µA dc
1336
Heater-cathode leakage
Ihk
---
50
MΩ
1211
Insulation of electrodes
R
50
---
Ohms
1511
Cathode interface life
7
Ef = 6.9 V; Ehk = 0
Ri
---
25.0
See footnotes at top of next page.
4
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