MIL-PRF-1/779K
TABLE I. Testing and inspection - Continued.
MIL-STD-
Symbol
Unit
1311
Limits
Requirement or test
Conditions
Acceptance
Level 16/
method
Min
Max
Conformance inspection,
part 2 -Continued
Grid emission
1266
Is
ľAdc
Ef = 14.0 V; Eb = 120 Vdc;
0
2.5
-5.0
Ec = -25 Vdc
(see notes 4 and 8)
1296
Pulse current (1)
ik
ma
Test condition (2);
900
2.5
---
(cathode)
Rk/k = 1.0 ohm
(see notes 4 and 9)
---
1296
Pulse current (2)
ik
ma
Test condition (2);
800
6.5
(cathode)
Ef = 12.0 V; Rk/k = 1.0 ohm
(see notes 4 and 9)
ĆSm
15
1306
Transconductance (2)
%
Test condition (1);
---
2.5
Ef
Ef = 11.4 V (see note 4)
21
1316
Amplification factor
Mu
---
Test condition (1)
16
2.5
(see note 4)
5.2
1331
Direct-interelectrode
Cgp
pF
No shield (see note 4)
2.8
5.2
capacitance
Cin
pF
No shield (see note 4)
2.8
0.78
Cout
pF
No shield (triode No. 1)
0.42
6.5
0.66
Cout
pF
No shield (triode No. 2)
0.34
9.7
Chk
pF
No shield (see note 4)
---
25
1231
Emission current
Is
ľAdc
Epp = 195 Vac; Ec = 0;
---
2.5
(anode)
Rk/Ib = 10.5 mAdc
(see note 10)
---
1121
Base strain
---
---
See note 11
---
---
---
2126
Glass strain
---
---
---
2.5
---
1041
Shock
---
---
Test condition (1);
---
6.5
450 G; Ehk = 100 Vdc
(see note 12)
---
1031
Vibration fatigue
---
---
2.5 G; F = 25 (min) ,60 (max);
---
6.5
fixed frequency
---
Post-shock and vibration-
fatigue test end points
150
Ep
mAdc
---
---
1031
Low-frequency vibration
50
1336
Heater-cathode leakage
Ihk
ľAdc
---
---
---
---
1306
Transconductance (1)
Sm
ľmhos
---
---
-3.0
1266
Total grid current
Ic
ľAdc
---
---
---
1105
Permanence of marking
---
---
---
See notes at end of table I.
3