MIL-PRF-1/776F
TABLE I. Testing and inspection.
Inspection
Method
Notes
Conditions
Symbol
Limits
Unit
MIL-STD-
1311
Min
Max
2/
Conformance inspection,
part 1
Filament current
---
1301
If
6.4
7.2
A ac
Peak emission
1231
---
eb = ec2 = ec1 = 2,500 v
is
3.5
---
a
Electrode voltage (grid)
1261
---
Ec1
-60
-83
V dc
µA dc
3/
Ic1
---
-10
Total grid current
1266
µA dc
Ef = 5.5 V ac;
Primary grid emission
Isg1
---
-200
1266
---
t = 15 seconds;
(control)
Pg1 = 6 watts or
Ic1 = 85 mA dc;
anode and screen
grid floating
µA dc
Primary grid emission
1266
---
Ef = 5.5 V ac;
Isg2
---
-200
(screen)
t = 15 seconds;
Ec1 = 0;
Pg2 = 25 watts or
Ic2 = 75 mA dc;
anode floating
⎧
Current division
1372
---
Eb = 500 V dc;
---
150
v
egk
⎨
(method B)
Ec2 = 350 V dc;
---
160
ma
ic1
⎩
Ec1 = -150 V dc;
---
300
ma
ic2
egk/ib = 800 ma;
tp = 2 µs (min);
prr = 30 (min)
Conformance inspection,
part 2
Amplification factor
1316
---
Connect g1 to g2;
Mu
5.2
6.5
---
Ec2 = 300 V dc;
Ic2 = 60 mA dc;
anode floating
4/
Eb = 3,000 V dc;
Po
1236
175
---
W
Power oscillation (1)
Ec2 = 350 V dc;
(useful)
Ib = 100 mA dc;
Ic2
15
50
mA dc
Rg1 = 15,000 ohms;
F = 15 MHz
⎧ Cgp
Direct-interelectrode
1331
---
---
0.07
pF
⎨ Cin
capacitance
9.2
12.4
pF
⎩ Cout
2.5
3.5
pF
See footnotes at end of table.
2
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