Radio Ancillary Equipment, Wireless Valve CV509 Type 6V6G Tetrode, American
Joint Service Type CV509 Octal based beam tetrode. Service name 6V6G. Army serials ZA5036, ZA3994, JC0246, ZC/10E349 & ZC/AY/W2077. Admiralty W2077. Air Ministry 10E/349 & 110E/90. GPO 196. Stores reference Z.5960-99-000-0509. American made valve used for the final audio stage of broadcast receivers from the mid-1930s and then adopted for military use.