MIL-PRF-1/1383D
TABLE I. Testing and inspection - Continued.
9/
Environmental requirements. Environmental requirements shall be as follows:
Water pressure at any inlet...........................................................100 max psi gauge
Maximum external gas pressure 1/ .............................................20 psi absolute, except in vicinity of output insulating
bushing (this vicinity is above plane BA-BA' of figure 1 where
it may be 60 psi absolute).
Minimum storage temperature 2/.................................................-65°C
10/
High-speed electronic protective devices shall be used to prevent energy from the anode, grid 1 and grid 2 power supplies
from permanently damaging the tube and its circuitry in the event of abnormal operation. High-speed electronic protective
devices are used in addition to the usual circuit breakers which alone do not provide adequate protection, especially when the
power-supply filter stores much energy.
a.
Additional protection against damage from anode-to-grid 2 fault shall be provided to prevent the grid 2 voltage from rising
to a value in excess of 3,000 volts.
b.
A test of the effectiveness of the protective devices may be made as follows: Disconnect anode, grid 1, and grid 2
supply-voltage leads from the tube. To simulate the internal bypass capacitors of the tube, connect a 0.015 µF high-
voltage capacitor between the "disconnected" grid 2 power-supply lead and ground. It may be necessary to simulate the
loading normally supplied by the tube through the use of "dummy" load resistors connected between the appropriate
"disconnect" points and ground. Fasten to the "disconnected" anode power-supply lead a small sheet (approximately 2
by 2 inches) of thin aluminum foil, such as household aluminum foil. Also, attach a similar small sheet of aluminum foil to
the "disconnected" grid 2 and grid 1 power-supply leads. Then discharge the full rated voltage of each power supply by
bringing a grounding rod slowly up to each piece of metal foil in turn. The respective protective devices are functioning
properly when the anode supply produces not more than a single pinhole in the foil attached to the anode power-supply
lead, and the grid 2 and grid 1 supplies produce no hole in the foil attached to the respective power-supply lead.
11/
The tube shall be operated within the specified frequency range and the specified minimum power output shall be obtained
when operating conditions are within maximum ratings.
12/
This specification sheet uses accept on zero defect sampling in accordance with MIL-PRF-1, table III.
____________
1/ Absolute pressure is the total pressure (sum of atmospheric pressure and gauge pressure). A pressurized output cavity
shall be used as required to prevent corona or external flash-over at the ceramic bushing.
2/ Water-cooled elements shall be free of water before storage or shipment to prevent damage from freezing.
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