High gain pentode originally designed for use in television receivers and released under the type number 1852. Manufacturer: Radio Corporation of America, Harrison, NJ, USA.
Were renamed 6AC7 and adopted for use in radar and other military applications during World War Two (1939-1945).
6.3 volt indirectly heated cathode.
Metal bulb on octal base.
Bulb: (RCA logo)/6AC7/1852/Made in U.S.A./K2
Type of item
64 mm (Length), 38 mm (Outside Diameter)