Downloaded from https://www.everyspec.com MIL-STD-1311C 31 January 2001 1. SCOPE 1.1 Purpose. This standard establishes uniform methods for testing the environmental, physical, and electrical characteristics of electron tubes as required by MIL-PRF-1 and the applicable tube specification sheet (TSS). Unless otherwise specified or authorized, tests shall be conducted as specified herein (see 4.6). 1