MIL-PRF-1/1225F
TABLE I. Testing and inspection - Continued.
Inspection
Method
Conditions
Acceptance Symbol
Limits
Unit
MIL-STD-
Level 11/
1311
Min
Max
Conformance inspection,
part 2 - Continued
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Post-shock and vibration
fatigue end points
400
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Ep
---
1031
Low-frequency vibration
mV ac
µA dc
30
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Ihk
---
1336
Heater-cathode leakage
µmhos
---
12,500
Sm
---
1306
Transconductance (1)
µA dc
-1.0
0
Ic1
---
1266
Total grid current
Base strain
1121
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---
---
---
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Glass strain
2126
6.5
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---
---
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Permanence of marking
1105
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---
---
---
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Conformance inspection,
part 3
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---
---
Ef = 7.5 V;
---
1506
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Heater-cycling life
Ehk = 60 V dc;
Eb = Ec1 = Ec2 = 0
Life-test end points
---
(heater-cycling)
µA dc
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Ihk
---
30
Heater-cathode leakage
1336
Eb = 200 V dc;
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---
---
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Stability life
1516
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Ec1 = +9 V dc;
Ec2 = 170 V dc;
Ec3 = 0;
Rk = 680 ohms;
Rg1 = 0.5 MegΩ;
TA = room temperature
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Life test end point
(stability)
ĆSm
%
10
1306
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Change in transconduc-
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tance (1) of individual
t
tubes
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Stability life-test conditions;
---
1501
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Intermittent life
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TE = +155°C (min) 8/ 9/
See footnotes at end of table.
3
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