MIL-PRF-1/1733A(NAVY)
TABLE I. Testing and inspection - Continued.
Inspection
Limits
Inspection
Method
Conditions
Acceptance
level or
Symbol
Unit
level
code
Min
Max
Conformance inspection,
part 3 - Continued
Multiple short life-test
end point (1):
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Peak power output
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Multiple short life (1)
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po
825
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kw
Periodic-check tests
Vibration
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22/ 23/
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Shock
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22/ 24/
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Vibration and shock test
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end point:
Peak power output
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po
225
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kw
1/
Because the filament voltage, when operated near the maximum value, provides emission in excess of any requirements within
tube rating, during life, the filament voltage shall be reduced to a value that will give adequate, but not excessive emission. Careful
attention to maintaining the value consistent with adequate emission will result in conserving the life of the tube. The filament
voltage shall be measured at the respective liquid coolant connections on the tube side of the threads. This procedure is essential
in order to accurately measure the filament voltage. At 400 Hz some heating of the filament leads and RF cathode terminal
(cathode header) occurs; this condition is not detrimental to tube operation or to tube life.
Peak positive supply voltage. The peak pulse value is defined as the maximum value of a straight line through the average of the
2/
fluctuations over the top portion of the pulse. The magnitude of any spike, on the anode voltage pulse, shall not exceed the peak
pulse value by more than 4,000 volts, and the duration of any spike (measured at a point 70 percent above the peak pulse value)
shall not exceed 2 2s. In the absence of RF output voltage, the peak pulse supply voltage may be exceeded by 20 percent but by
not more than 10 consecutive pulses. A pressurized output cavity is required, for operation at the maximum voltage specified
herein, to prevent external flashover at the insulating bushing (see 9/).
3/
Peak positive screen voltage. The peak pulse value is defined as the maximum value of a straight line through the average of the
fluctuations over the top portions of the pulse. The magnitude of any spike, on the grid(2) voltage pulse, shall not exceed the peak
pulse value by more than 250 volts, and the duration of any spike (measured at a point 70 percent above the peak pulse value)
shall not exceed 2 2s.
4/
On time is defined as the sum of the durations of all the individual pulses which occur during any 3,000 2s interval.
5/
Peak rectified grid(1) current.
6/
Minimum time to reach operating filament voltage shall be 30 seconds. After operating filament voltage has been obtained, a
minimum of 90 seconds heating time is required before other electrode voltages can be applied. Filament current shall not
exceed 550 amperes, even momentarily.
Cooling requirements.
7/
a.
Air cooling. Forced-air cooling of the ceramic bushing at the grid(1) seal and at the anode seal may be required in order to
limit the temperature of the ceramic bushing at either seal to the specified maximum value of +150GC. Under such conditions,
provisions shall be made for blowing air at the ceramic bushing through suitable openings in the coaxial-cylinder cavity circuit.
4
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