MIL-PRF-1/1624B(NAVY)
TABLE I. Testing and inspection - Continued.
23/ The tuner dial shall be set for frequency F3. Cooling air shall be applied so that the frequency determining element temperature
shall fall between 80 C and 120 C after thermal equilibrium has been reached. The tube shall then be allowed to cool with no
voltages applied for at least 15 minutes before the following test. Anode voltage as specified shall be applied after 300 seconds
heater warmup time. The frequency as measured at any time within a 20-minute period after application of pulse voltage shall be
within the limit specified herein from the frequency after thermal equilibrium has been reached.
24/ Life-test shall be conducted in accordance with the following cycle:
Condition
Ib
Ef
Duration (minutes)
Standby
0
16.0
5
Operating
6.5
13.2
60
Off
0
0
5
The accumulation of the "on" time shall be the only time considered in determining compliance with the minimum value. The
frequency shall be changed a minimum of 100 MHz every 72 hours during life test between the limits of F2 and F4.
25/ The pressure specified herein shall be supplied to the tube output. There shall be no leaks as evidenced by metered pressure fall-
off, or by bubbles if the test is performed with the tube immersed in water. The time of the test shall be 1-minute minimum.
26/ Normal tube under test (TUT) operation shall be exhibited over the full frequency range from F1 through F5.
27/ Revision letters are not used in this revision to identify changes with respect to the previous issue, due to the extensiveness of the
changes.
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