MIL-PRF-1/1634E
11.
At the conclusion of this test, the TUT shall satisfy the requirements of the total grid current test (method 1266)
specified herein under conformance inspection, part 1.
12.
The TUT shall be mounted in a resonance free jig and vibrated with sinusoidal excitation in each of the three
mutually perpendicular lanes: (The X-axis shall be defined as normal to a plane drawn through base pins
numbered 3 and 7.)
Survey test: The TUT shall be vibrated for 60 seconds at the frequency which produces maximum vibration
output noise voltage in each of the three positions. If at the end of 60 seconds, the vibration noise output is
increasing, the vibration shall continue until there is no further increase. There shall be no indication of shorts
during this test and the TUT output noise voltage shall not exceed the limit specified herein.
Cycling test: The frequency shall vary from 28 to 750 to 28 Hz with approximately logarithmic progression, and
shall require 6 to 12 minutes to transverse the range, which shall constitute one cycle. The TUT shall be vibrated
for one such cycle in each of the three planes.
13.
The TUT shall be subjected to six shocks of the specified peak amplitude and duration in each of the three
mutually perpendicular directions. Following the impact test, the TUT shall be rejected if it exhibits permanent
shorts, or more than one temporary short during the test.
14.
The forced cooling test shall be conducted as follows: The base and anode of the TUT shall be cooled by
applying an airflow of 7.8 cfm (maximum) from a single source using the infinite baffle system shown on figure 2,
or equivalent. Air under standard conditions of temperature and pressure shall be used, or appropriate
corrections applied. The anode core temperature shall not exceed the specified limits at the specified test
conditions. Temperature shall be measured by means of a thermocouple embedded in the top of the core,
adjacent to the cooler. This shall be done by drilling a small hole, shallow enough to prevent loss of TUT vacuum,
placing the welded thermocouple junction therein, and then peening the edges of the hole to hold the
thermocouple firmly in place. In all cases, good electrical continuity between the thermocouple and the metal
area in close proximity shall be demonstrated prior to performing the cooling test.
15.
This test shall be performed with the TUT operating under the conditions specified for the forced cooling test (see
note 14), using the infinite baffle system shown on figure 2, or equivalent. The static pressure drop shall be
measured across the TUT and sockets.
16.
This test shall be performed during the initial production and once each succeeding three-calendar months in
which there is production. A sampling plan shall be used, with a sample of four tubes with an acceptance number
of zero defects. In the event of failure, this test will be made as a part of conformance inspection, part 2, with an
acceptance level of 6.5 (see note 17). The regular "three-month" sampling plan shall be reinstated after three
consecutive samples have been accepted.
17.
The acceptance level for each test listed under conformance inspection, part 1, shall be 0.65. This specification
sheet uses an accept on zero defect sampling plan in accordance with MIL-PRF-1, table III.
18.
Reclaimed materials shall be utilized to the maximum extent possible as cited in MIL-STD-961 and MIL-STD-962 within the
quality limits required by this document and to fulfill compliance with the Resource and Recovery Act of 1976 (Public Law
94-580 dated 21 October 1976).
19.
Direct questions on the availability of "JAN" drawings to the preparing activity: DSCC-VAT, Defense Supply Center
Columbus, P.O. Box 3990, Columbus, OH 43216-5000.
Custodians:
Preparing activity:
Army - CR
DLA - CC
Navy - EC
Air Force - 11
(Project 5960-3620)
DLA - CC
Review activities:
Army - AV, CE, CR4, MI, SM
Navy - AS, CG, MC, OS
Air Force - 99
8
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