MIL-PRF-1/1634E
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* Unit
* Inspection
* Notes
* Method
Conditions
* Symbol
Limits
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*Conformance
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*inspection, part 3
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* - Continued
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*In.H20
*Coolant-pressure drop
* 8,15
* 1155
*Eb = 2,000 V dc;
* 1.3
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* versus coolant flow
*Ec1/Ib = 175 mA dc
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*Linear amplifier
*8,9,16
* 2204
*Eb = 2,200 V dc;
* Po
* 250
* W(useful)
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* power output
*Ec2 = 400 V dc;
* 3rd IM
* -22
* dB
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* and distortion
*Ec1/Ibo = 70 mA dc;
* 5th IM
* -30
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* µA dc
* (procedure 2.1)
*Eg1/Ib = 225 mA dc (1-tone);
* Ic1
* 50
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*Rl = 5,000 ± 100 Ω;
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*Rg = 1,000 Ω maximum;
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* anode tank
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* Q = 10 to 15
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* t = 180 (max);
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* f = 2 to 10 MHz
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NOTES:
1. Maximum tube life may be obtained by adjusting the heater voltage (Ef) in accordance with the application. The
heater voltage (nominal and derated) shall be maintained within ±5 percent when consistent operation.
At an anode dissipation of 350 watts and an incoming air temperature of 50°C maximum, a minimum airflow of
2.
7.8 cubic feet per minute (cfm) at sea level shall pass through the tube's anode cooler. At this flow rate of 7.8
cfm, the static pressure drop across the tube and socket shown on drawing 246-JAN (see note 19) is
approximately 1.2 inches of water. The pressure drop varies with the amount of escaping air and the shape and
construction of the air director. Air cooling of the tube shall be increased with increased incoming air temperature
or with increased altitude, or a combination of both. In all cases of operation, a socket which provides forced-air
cooling of the base shall be used and maximum seal temperature ratings must not be exceeded. The airflow
shall be applied before or simultaneously with electrode voltages, and may be removed simultaneously with them.
3.
In all electrical tests involving heater voltage, the socket shown on drawing 246-JAN (see note 19) shall be used.
Forced-air cooling is permitted at the rate of 8.0 cfm maximum for the base and anode, unless otherwise
specified in the specific test conditions. A separate source may be used for the base and anode provided neither
exceeds 8.0 cfm. Air under standard conditions of temperature and pressure shall be used, or appropriate
corrections applied.
4.
This test shall be the first test performed at the conclusion of the holding period.
5.
The voltages applied to the plate and grids shall not exceed 450 volts. The applied voltage shall have a
maximum pulse repetition rate (prr) such that the duty cycle (Du) shall not exceed 0.0002 (0.02 percent) based on
the pulse length measured at 50 percent amplitude. The pulse duration (tp) shall not be less than 3 µs at 5
percent of the maximum value, and shall not exceed 2 µs at 50 percent amplitude.
6.
Method 1231: Pulsing emission (1) or pulsing emission (2) may be performed alternately. However, only one of
these tests shall be performed.
7.
Measurements shall be taken during an interval of three minutes immediately following the required warmup
period.
8.
The test sample may be composed of tube type 8321, 8321A, or 8322, or a combination thereof to satisfy the
specified requirements for both tube types.
9.
Prior to conducting this test, the TUT shall be operated in a static condition (Eb = 2200 V dc; Ec2 = 400 V dc;
Ec1/Ibo = 70 mA dc) for three minutes (minimum) to demonstrate that the Ibo value remains constant (i.e., Ibo =
70 ±5 mA dc). The TUT shall be considered to fail this test if it exhibits instability after five minutes of testing. If
there is a failure, reprocessing and retesting for stability shall be the only condition permitted for continuing this
test.
10.
The following measurements shall be made prior to conducting life test (1): Method 1366: Interelement leakage
resistance with 50 Meg (minimum) for each of the required measurements. Method 2204: Linear power output
and distortion with limits and conditions as specified under conformance inspection, part 2.
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