MIL-PRF-1/1767D
TABLE I. Testing and inspection. - Continued.
Inspection
Method
Conditions
Symbol
Limits
Unit
Min
Max
Conformance
inspection, part 3
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2/
Service-life guarantee
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No voltages applied; shock
Shock, specified pulse
1042
= 11 ms half-sine; accel
3/
= 15 G peak (min); impacts
= 6 ( 3 each X and Z axes)
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No voltages applied; accel
1032
Vibration, mechanical
= 2 G peak (min); F = 10 to
3/
50 Hz, ascending only;
sweep t = 3 to 8 minutes; 1
sweep each X and Y axes
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Shock and vibration,
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mechanical end points:
V dc
-146
-100
Ec1
Electrode voltage
1261
(grid)
µA dc
-30
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Ic1
Total grid current
1266
ĆIf
3
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Filament current 4/
1301
A ac
1/ During this test the tube shall be operated as a Class AB1 amplifier; the control gird shall not be driven positive, as indicated
by grid current flow.
2/ The tube manufacturer warrants the tube for 1 year from date of shipment, or 1,000 hours of filament life, whichever first
elapses. This warranty applies only when the tube is operated within the maximum ratings (see "Absolute `Ratings" of
MIL-PRF-1). A defective tube shall either be replaced, or at the option of the manufacturer, a credit shall be made in the
amount of the original purchase price pro rated on the basis of 1,000 hours of "filament-on" time.
3/ Testing shall be performed every 6 months, with eight samples and acceptance on zero defects.
Separate samples may be used at the option of the manufacturer. None of the listed tests shall be considered destructive
except in case of failure. In the event of failure after sampling, that specific test shall become conformance inspection, part 2;
after three consecutive successful submissions, the testing may revert to the conformance inspection, part 3 tests.
4/ Any change in filament current resulting from the vibration or shock testing (considered individually) shall not exceed the
specified limit for ĆIf.
5/ This specification sheet utilizes accept on zero defects sampling plan in accordance with MIL-PRF-1, table III.
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