Downloaded from https://www.everyspec.com MIL-STD-1311D METHOD 1267 AIR LEAKS 1. Tubes shall be tested for air leaks by one of the following methods: a. In gridded tubes, grid current is one microampere or is twice the maximum initial limit, whichever is greater. In those cases in which there is a different maximum limit after life test, twice the life-test limit shall be used in judging an air-leak defect that occurs during life test. b. In vacuum diodes, appearance of ionized gas in space outside the anode (not to be confused with bulb fluorescence). NOTE: In those cases where such methods cannot be applied, air leaks shall be defined by the individual TSS. METHOD 1267 1267-1 19 April 1968