MIL-PRF-1/665F
TABLE I. Testing and inspection - Continued.
11/ The tube shall be mounted with the cathode vertical within 15' and with the end of the cathode bushing pointing in
the downward direction.
12/ Power input to the tube during life test shall be cycled according to the following schedule:
Preheat (heater): 5 minutes.
Oscillate (RF):
4 hours.
All voltages off: 1 hour.
13/ The interpretation of the VSWR shall be as specified in MIL-STD-1311, method 4310. The standing wave
introducer shall be cycled continuously through a one-half wavelength line at a minimum rate of one cycle/hour.
14/ The heater current should be reduced at 75 percent of the maximum power input. This reduced heater current
shall be maintained at ± 3.5 percent of the specified value.
15/ Each tube shall be labeled to indicate If for both preheat and radiate conditions.
16/ The interpretation of the VSWR shall be as specified in MIL-STD-1311, method 4310. The missing pulse rate
shall be counted during the last 5 minutes of a test interval not to exceed 15 minutes.
17/ The peak anode current shall be varied at more than 50 Hz through a range exceeding 20 percent, but not
exceeding 45 percent of the peak value obtained under test condition 1 or test condition 2 conditions; the
average current being held at test condition 1 or test condition 2 value. This test may be performed under either
test condition 1 or test condition 2 conditions. The frequency shift per ampere shall be within the limit specified.
18/ This test shall be conducted for only one set of conditions within the limits specified for the test condition
specified. The pulse characteristics shall be measured as follows:
tfc and tfv: 0 to 85 percent point
trc and trv: 20 to 85 percent point
No spike ripple shall exceed ± 7 percent of the average peak value of the voltage pulse. Inverse voltage shall not
exceed 35 percent of the forward voltage. There shall be no negative post-pulse voltage.
19/ The rf bandwidth shall be within the limits specified where a VSWR of 1.5:1 is introduced into the load, the phase
being adjusted for maximum spectrum width.
20/ This specification sheet uses accept on zero defect sampling in accordance with MIL-PRF-1, table III.
21/ With qualifying activity approval in each case, the manufacturer may provide, in accordance with MIL-PRF-1,
service-life guarantee, in lieu of performing life testing. Life test endpoints specified shall apply to service-life
guarantee conformance as well as to life test conformance. The number of hours of system-deployed,
accumulated tube-operating time shall be approved by the qualifying activity and be a minimum of 400 hours.
Service-life guarantee shall define tube operating life and not time from purchase or delivery. Tubes sold under
service-life guarantee shall be marked with contract number and with the number of tube operating hours
guaranteed. The qualifying activity my restore life testing requirements when service performance or tube
reliability indicate it is justified.
5
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business