MIL-PRF-1/4K
TABLE I. Requirement or test - Continued.
Limits
MIL-STD-1311
Conditions
Symbol
Requirement or test
Unit
method
Min
Max
Conformance Inspection,
part 3
Heater-cycling life
1506
Ef = 7.5 V;
---
---
---
---
Ehk = +135 V dc;
EC1 = Ec2 = Eb = 0
Heater-cycling life test
---
end point
µA dc
Heater-cathode leakage
1336
Ihk
---
20
Stability life
1516
Eb = 150 V dc;
---
---
---
---
Ec1 = 0; Ec2 = 125 V dc;
Ehk; = +135 V dc;
Rk = 130 ohms;
Rg1 = 0.1 MegΩ;
TA = room
Stability life-test end point
---
ĆSm
Change in
1306
---
10
%
transconductance (1)
t
of individual tubes
Intermittent life
1501
Stability life-test
---
---
---
---
conditions;
TE = +165°C (min)
(see note 8)
Intermittent life-test end
---
points (1,000 hours):
Inoperatives
---
---
---
---
---
µA dc
Total grid current
1266
Ic1
0
-0.1
Heater current
1301
If
160
196
mA
ĆSm
Change in
1306
---
30
%
transconductance (1)
t
of individual tubes
ĆSm
Transconductance (2)
1306
---
20
%
Ef
µA dc
Heater-cathode
1336
Ihk
---
10
leakage
MegΩ
Insulation of
1211
R
50
---
electrodes
See notes at end of table.
4
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