MIL-PRF-1/1221D
TABLE I. Testing and inspection.
Inspection
Method
Conditions
Acceptance Symbol
Limits
Unit
MIL-STD-
level
11/
Min
Max
1311
Conformance inspection,
part 1
mA
625
575
If
0.65
Ef = 6.3
1301
Heater current
2/ 3/
0.65
Ib
33
82
mA dc
1256
Ec1 = 0
Electrode current (1)
(anode)
2/
0.65
Ib
7.5
31
mA dc
1256
Electrode current (2)
(anode)
Ec1 = -11.0 V dc 2/
1256
Electrode current (3)
0.65
Ib
---
125
µA dc
(anode)
Rc1 = 0.1 MegΩ 2/ 4/
0.65
Ic1
---
-1.0
Total grid current
1266
µA dc
2/
0.65
Ic2
1.5
7.5
mA dc
Electrode current (screen)
1256
0.65
ik
650
---
ma
Pulse cathode current
---
Eb = Ec2 = 200 V dc;
Du = 0.04; Ef = 5.3 V;
egk = +25 v;
Rk = 1 ohm; R1 = 0;
tp = 800 µs 5/
1201
0.4
---
---
---
---
Short and discontinuity
detection
Conformance inspection,
part 2
Insulation of electrodes
6/ 7/
2.5
1211
---
---
---
---
Heater-cathode leakage
1336
---
Ihk
---
40
µA dc
Ec1/Ib = 25 mA dc 2/
---
Sm
7,800
13,200
Transconductance
1306
µmhos
Cgp
6/
Direct-interelectrode
---
0.2
1331
pF
Cin
5.1
capacitance
7.7
pF
6.5
Cout
1.4
1.8
pF
Primary grid emission
1266
Ef = 7.0 V ac; Pg1 = 0.15 W ;
---
Isg1
---
-10
µA dc
(control)
Eb = Ec2 = 0 6/ 8/
1266
Ef = 7.0 V ac;
Primary grid emission
---
Isg2
---
-200
µA dc
Pg2 = 3.5 W ;
(screen)
Eb = Ec1 = 0 8/
---
Po
4.1
---
W
Power oscillation (1)
1236
Push-pull class C amplifier;
(useful)
F = 470 to 500 MHz;
Eb = Ec2 = 180 V dc;
Ic1 = 0.75 mA dc/grid;
Rc1 = 27,000 ohms/grid;
Rc2 = 100 ohms;
Ib =65 mA dc (max);
Ic2 = 15 mA dc (max)
See footnotes at end of table.
2
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