MIL-E-1/424 Revision B, November 26, 1968
ELECTRON TUBE, TYPE 6F4
Includes all amendments and changes through Notice 1, April 19, 1996
The complete requirements for procuring the electron tube described herein shall consist of this document and the latest issue of Specification MIL-E-1.
This specification is mandatory for use by all Departments and Agencies of the Department of Defense.