MIL-PRF-1/1069G
NOTES:
1. This test shall be performed at the conclusion of the holding period.
2. This test shall be conducted on the initial lot and thereafter on a lot approximately every 12 months. When
one lot has passed, the 12-month rule shall apply. In the event of lot failure, the lot shall be rejected and
the succeeding lots shall be subjected to this test until a lot has passed.
3. Prior to this test, tubes shall be preheated 5 minutes at the conditions indicated below. The 3-minute test
shall not be permitted. Test at specified conditions within 3 seconds after preheating. Grid emission shall
be the last test performed on the sample selected for the grid emission test.
Ef
Eb
Ec1 Ec2
Ec3
Rk
Rg1
MegΩ
V
V dc
V dc V dc
V dc
ohms
7.5
120
0
120
0
200
1.0
4.
See "Reduced pressure (altitude) rating", and altitude, maximum peak voltage in the basic document.
A grid resistor of 0.1 MegΩ shall be added; however, this resistor shall not be used when a thyratron-type
5.
short indicator is used.
6.
Envelope temperature (TE) requirements, when measured in accordance with the temperature by
conduction-band measurement (method 1226), will be satisfied if a TUT having bogey Ib (±5 percent) under
normal test conditions, is determined to operate at or above minimum specified temperature at any position
in the life-test rack.
7.
Revision letters are not used in this revision to identify changes with respect to the previous issue, due to
the extensiveness of the changes.
8.
The life-test sample shall consist of 10 tubes per lot and no tube failure shall be permitted. In the event of
rejection of the first sample, due to failure of 1 tube, a second sample of 20 tubes shall be selected from the
lot. Acceptance shall then be based on the second sample, which shall be tested with no failures.
9.
This specification sheet uses accept on zero defect sampling plan in accordance with MIL-PRF-1, table III.
Referenced documents: In addition to MIL-PRF-1, this document references the following: MIL-STD-1311
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