MIL-PRF-1/911E
TABLE I. Testing and inspection - Continued.
1/
Maximum forward pulse duration 5 µs; maximum inverse pulse duration 10 µs; pulse repetition rate 2,000 maximum. This tube is
not recommended for power rectifier applications, but is intended primarily for clipper diode use in hard tube modulator circuits only
where the inverse duration is not to exceed 10 µs.
2/
The tube shall be operated in a pulsing circuit. The inverse pulse shall be of not less than 1 µs nor more than 5 µs duration.
There shall be no evidence of sustained arc back or sputtering during this test.
3/
The anode current shall not vary from the initial value at any time during the test by more than the specified amount.
4/
The base shall be subjected to a gradually applied torque of 12.0-pound inches. This test shall not cause broken leads, broken
welds, broken solder-joints, broken or cracked glass.
5/
This test is to be the first test performed at the conclusion of the holding period.
6/
This test shall be performed during the initial production and once each succeeding 12-calendar months in which there is
production. An accept on zero defect sampling plan shall be used, with sample of three tubes with an acceptance number of zero.
In the event of failure, the test will be made as a part of conformance inspection, part 2, with an acceptance level of 6.5 (see 7/).
The "12-calendar month" sampling plan shall be reinstated after three consecutive samples have been accepted.
7/
This specification sheet uses accept on zero defect sampling in accordance with MIL-PRF-1, table III.
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