MIL-PRF-1/1404E
TABLE I. Testing and inspection.
Inspection
Method
Notes
Conditions
Acceptance
Symbol
Limits
Unit
MIL-STD-
Level
12/
Min
Max
1311
Conformance inspection,
part 1
-1.0
0
4/
Ic1
1266
0.65
Total grid current
µA dc
Electrode current (1)
1256
4/
0.65
Ib
28
52
mA dc
(anode)
Operation current (1)
---
5/
0.65
Ip
60
72
mA ac
Operation current (2)
---
5/
Ef = 2.125 V dc
0.65
Ip
55
---
mA ac
Short and discontinuity
1201
---
0.4
---
---
---
---
detection
Conformance inspection,
part 2
Electrode current
---
Ic2
0
7.0
mA dc
1256
---
(screen)
Electrode current (2)
1256
---
Ec1 = -20 V dc
---
Ib
---
2.0
mA dc
(anode)
Amplification factor
1316
---
Screen grid tied to
---
Mu
8
14
---
(triode)
anode
---
Is
---
200
1266
6/
Primary grid emission
If = 2.5 V ac;
µA dc
(screen)
Eb = 0;
Ec2 = 150 V ac;
t = 300 (max)
---
t
---
0.5
sec
Heating time
---
7/
Ef = 2.5 V ac;
Ebb = 150 V dc;
Ecc2 = 120 V dc;
Ecc1 = 0;
Rg1 = 20,000 ohms;
Eg1 = 13 V ac;
Rl = 1,000 ohms;
Rg2 = 470 ohms;
Ib = 17 mA dc;
C1 = 16 µF;
(see figure 2)
Cgp
pF
0.25
---
Direct-interelectrode
1331
---
No shield
Cin
pF
8.8
5.8
capacitance
---
Cout
pF
6.9
3.9
See footnotes at end of table.
2
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