MIL-PRF-1/466C
TABLE I. Testing and inspection
Limits
Acceptance
MIL-STD-
level 6/
Symbol
Unit
Requirement or test
Notes
Conditions
1311
Min
Max
method
Conformance inspection, part 1
mA dc
30.0
16.0
Ib
0.65
---
1256
Electrode current (1) (anode)
µA dc
100
---
Ib
0.65
Ec = -10 V dc
---
1256
Electrode current (2) (anode)
µA dc
-0.5
0
Ic
0.65
3,4
1266
Total grid current
µmhos
20,000 30,000
Sm
0.65
---
1306
Transconductance (1)
ĆSm
%
12
---
0.65
Ef = 5.7 V
4
1306
Transconductance (2)
---
---
---
---
0.4
---
Short and discontinuity detection
1201
Conformance inspection, part 2
---
---
4.0
---
---
---
1211
Insulation of electrodes
---
Ep
---
Rp = 2,000 ohms;
mV ac
---
500
1031
Low-frequency vibration
Rk = 0;
Ec = -2.0 V dc
---
Ihk
---
µA dc
---
20
Heater-cathode leakage
1336
280
If
---
mA
---
320
Heater current
1301
35
Mu
---
---
---
55
Amplification factor
1316
Ck-gh
Without external shield
pF
---
10.0
Direct-interelectrode capacitance
1331
8.0
Ck-kh
6.5
pF
0.55
---
Cp-gh
pF
1.95
1.5
Glass strain
2126
---
4.0
---
---
---
---
Base strain
1121
---
---
---
---
---
---
---
---
---
---
---
Permanence of marking
1105
---
Conformance inspection, part 3
---
---
---
---
---
Group A;
5
1501
Intermittent life
Ehk = 55 V;
TE =130°C
Intermittent life-test
---
end points (500 hours):
µmhos
---
16,000
Sm
---
---
Transconductance (1)
1306
µA dc
-1.0
---
Ic
---
---
Total grid current
1266
NOTES:
1. The reactance of the cathode by-pass capacitor shall be 0.5-ohm maximum at the test frequency.
2. See "Reduced pressure (altitude) rating" paragraph in the basic document.
3. Approved alternate test: The insertion of a 0.47 megohm resistor in series with the grid shall not change the anode current
by more than 3.0 mA dc.
4. This test to be performed at the conclusion of the holding period.
5. Envelope temperature (ET) requirements, when measured in accordance with the temperature by conduction-band
measurement (method 1226), will be satisfied if a tube having bogey Ib (±5 percent) under normal test conditions, is
determined to operate at or above minimum specified temperature at any position in the life-test rack.
6. This specification sheet uses accept on zero sampling in accordance with MIL-PRF-1, table III.
2
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