MIL-PRF-1/1336G
TABLE I. Testing and inspection - Continued.
4/ Cooling shall be employed if the additive effects of simultaneous operation at high altitude and high dissipation or proximity to other
heat sources in the equipment tend to cause the maximum bulb temperature to be exceeded.
5/
See "Reduced pressure (altitude) rating", and altitude, maximum peak voltage in the basic document.
6/
This test shall be performed at the conclusion of the holding period.
7/
The circuit shown on figure 3, or the equivalent, shall be used for high-voltage anode current (2) test and high voltage pulse
operation test.
8/
After a minimum preheat fo 30 seconds using Ef = 6.3 volts only, the tube shall be tested under the following conditions: A
substantially rectangular pulse with a width of 4 µs and a prr of 250 shall be applied to the grid of the tube under test. Initial arcing
may be tolerated, but the tube shall be free of such arcing during final 30 seconds. of a 1-minute test.
9/
All voltages apply simultaneously. There shall be no preheating. The grid current is read after 5 minutes.
10/
This test shall be conducted on the initial lot and thereafter on a lot approximately every 12 months. W hen one lot has passed, the
12-month rule shall apply. In the event of lot failure, the lot shall be rejected and the succeeding lots shall be subjected to this test
until a lot passes (see 13/).
11/
This test shall be performed with an average acceleration level equal to the specified value while being swept through the
frequency range of 50 to 500 to 50 Hz. The tubes shall be mounted in each of three planes X, Y, and Z for one-third of the total
excitation time. The frequency in Hz shall be scanned continuously up and down through the entire frequency range at the rate of
approximately 2 minutes. The total excitation time for the test shall be 96 hours.
12/
The circuit shown on figure 5, or equivalent, shall be used for life-test operation.
13/
This specification sheet uses accept on zero defect sampling in accordance with MIL-PRF-1, table III.
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