MIL-E-1/1404 Revision C, September 12, 1972
ELECTRON TUBE, RECEIVING TYPE 2DF4
Includes all amendments and changes through Validation Notice 1, June 13, 1989
Additional Comments: CNCL S/S BY MIL-PRF-1/1404
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.