MIL-PRF-1/1633B
TABLE I. Testing and inspection - Continued.
21/ At zero hours, establish the drive conditions necessary to obtain 3.0 amperes peak anode current with an anode voltage of
1,000 V dc and a bias voltage of -40 V dc. The pulse width of the modulator shall be 2 µs minimum and the duty cycle shall be
0.0025 maximum. W ith the drive level determined at zero hours, check the anode current at the end of life. The maximum allowable
drop in anode current (Ćib) is 25 percent. Group B shall apply except it shall be permissible to represent a lot not to exceed one
month's production with a sample of 12 tubes. No failures are allowed.
22/ Superseding USAF AFLC Drawing 67B1800, Revision B, dated 31 July 1967.
23/ Test in a cavity in accordance with applicable part of Canadian Marconi Co. rf power amplifier 407-057, or equivalent. The cavity
shall be connected to a 50-ohm load with a VSW R less than 1.5 to 1. The oscillator output coupling and the grid or cathode resistor
may be adjusted for maximum power output. Driving power is defined as the net power delivered to the amplifier cavity input
terminals, and the reflected power shall be subtracted from the incident power to obtain the net driving power. The amplifier output
tuning may be adjusted for maximum power output.
24/ The test shall be made in accordance with Drawing 281-JAN. Calibrate the circuit adjusting the cavity until the frequency of
resonance is 1,980 ± 25 MHz at room temperature with a tube which meets the resonance test requirements. In the grid distortion
test the frequency shall first be measured with Ef = 6.3 volts and then the grid dissipation increased to 2 watts with Eb = -150 V dc.
The change in frequency shall not be greater than the limit specified herein. Cooling air at room temperature may be used.
25/ In CW oscillator or amplifier service, the anode voltage (Eb) and grid voltage (Ec) may be applied simultaneously with heater voltage
(Ef) if Eb does not exceed 650 V dc.
26/ This specification sheet uses accept on zero defect sampling plan in accordance with MIL-PRF-1, table III.
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