MIL-PRF-1/779K
TABLE I. Testing and inspection.
Limits
MIL-STD-
Symbol
Unit
Requirement or test
Conditions
Acceptance
1311
Level
Min
Max
16/
method
Conformance inspection, part 1
1256
Electrode current (1)
Test condition (1)
0.4
Ib
27
45
mAdc
(anode)
(see notes 4 and 5)
1266
Total grid current
Test condition (1)
0.4
Ic
0
-1.5
µAdc
(see notes 4 and 5)
1301
Heater current
0.4
If
410
470
mA
1306
Transconductance (1)
Test condition (1)
0.4
Sm
8,500
14,500
µmhos
(see note 4)
1336
Heater-cathode leakage
See note 4
0.4
Ihk
---
30
µAdc
1201
Short and discontinuity
0.4
---
---
---
---
detection
Quality conformance
inspection, part 2
Insulation of electrodes
1211
E(g to all) = -300 V
---
---
E(a to all) = -500 V
2.5
---
---
(see note 4)
100
mVac
Low-frequency vibration
1031
Test condition (1);
6.5
Ep
---
F=40 Hz; 10 G;
Rp = 2,000 ohms
(see note 4)
---
---
Noise and microphonics
2201
Ebb = 300 Vdc;
2.5
---
---
Ec = 0;
Esig = 70 mVac
Rk = -680 ohms;
Rg = 1.9 MegΩ;
Rp = 2,000 ohms
(see note 6)
6.0
mAdc
Electrode current (2)
1256
Test condition (1);
2.5
Ib
---
(anode)
Eb = 300 V dc;
Ec = -20 V dc
(see note 4)
1.0
mAdc
Electrode current (3)
1256
Test condition (1);
2.5
Ib
---
(anode)
Eb = 300 Vdc;
Ec = -25 Vdc
(see note 4)
See notes at end of table I.
2