MIL-E-1/190K
NOTES: - Continued.
5. Prior to this test, tubes shall be preheated a minimum of 5 minutes with all sections operating at the conditions
specified below. The 3-minute test is not 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
Ec1
Eb
Rk
Rg
MegΩ
V
V dc
V dc
Ohms
7.5
0
150
820
1.0
6. A grid resistor of 0.1 megohm shall be added; however, this resistor shall not be used when a thyratron type
short indicator is used.
7. Envelope temperature (TE) requirements, when measured in accordance with the temperature by conduction-
band measurement (MIL-STD-1311, method 1226), will be satisfied if a tube 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.
Referenced documents. In addition to MIL-PRF-1 this specification sheet references MIL-STD-1311.
The margins of this specification are marked with vertical lines to indicate where changes from the previous issue
were made. This was done as a convenience only and the Government assumes no liability whatsoever for any
inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document
based on the entire content irrespective of the marginal notations and relationship to the last previous issue.
Custodians:
Preparing activity:
Army - CR
DLA - CC
Navy - EC
Air Force - 85
DLA - CC
(Project 5960-2013-026)
Review activities:
Army - AR, MI
Navy - AS, CG, MC, OS
Air Force - 99
NOTE: The activities listed above were interested in this document as of the date of this document. Since
organizations and responsibilities can change, you should verify the currency of the information above using the
ASSIST Online database at https://assist.dla.mil/.
5
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