MIL-PRF-1/1757B
4/
Sufficient conduction, convection, or forced-air cooling shall be provided for the anode shank and all seals to limit the
maximum temperature to the specified value under all operating conditions. W here emphasis is placed on long and reliable
life, lower temperatures should be maintained.
5/
W ith an anode dissipation of 100 watts and with an incoming air temperature of 25ºC maximum at seal level a minimum
airflow of 12.5 cfm shall be directed across the anode cooler, using the cowl.
6/
In all electrical tests involving application of heater voltage, conduction, convection, and/or forced-air cooling may be used to
assure operation within the maximum rated temperature limits.
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GENERAL:
Qualification - Required.
Compatibility testing - Required
(In addition to the requirements specified herein, compatibility testing shall be required in
the AN/URN-3 and AN/GRN-9 equipments. A sample of 20 tubes shall be supplied to
Naval Air Test Center (NESTED), Patuxent River, Maryland 20670, on a noninterference
basis, to be tested for adequate gain and tuning capability, and good tracking, in both low
and high band heads. Also, of the 20 tubes supplied, a sample of four tubes shall be
selected for life testing. Each tube shall achieve a minimum of 500 hours operation. In the
event of no failures, the sample shall be considered as acceptable when a total of 1,600
hours has been accumulated.
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