20.07a,b,c

Tube, Radio Transmitter

1940 Approximate

E. F. Johnson Company Product. Radio Transmitter Tubes. Material: glass, metal. (a) Tube. Size: 4 1/2" base diameter x 13 1/2" H. Description: white ceramic base; a red and gold sticker on side of base printed in black: "E.F. Johnson Co. Waseca, Minn. U.S.A."; four silver metal brackets around base lettered: "F, G, F, P"; silver metal band around base of glass bulb printed: "Reg. U.S. Eimac Pat. Off. Eitel-McChllough, Inc. San Bruno, Calif. USA Jan-CIM-450th Made in U.S.A."; clear glass bulb with red print: "Eimac 450t Made in USA"; metal elements inside bulb; silver metal top. (b) Tube. Size: 2 5/8" square x 4 1/4" H. Description: white ceramic base with clear glass bulb at top; two silver metal prongs at top of bulb; metal elements inside bulb. (c ) Tube. Size: 2 1/2" W. x 8 1/2" L. x 8 /14" H. base. Description: brown metal base with two white ceramic bases attached; red and gold sticker on side of base printed in black: "E.F. Johnson Co. Waseca, Minn. U.S.A." and lettered around base: "F, P, Johnson, G, F, 210"; white ceramic bases connected together with two metal wires; silver metal bands around each of the glass bulbs; glass bulb on each base; metal elements inside bulbs; silver metal tops.

Waseca business: E.F. Johnson Co.; E.F. Johnson Company; E.F. Johnson Corporate Headquarters; E.F. Johnson Company Corporate Headquarters; E.F. Johnson Co. Corporate Headquarters; E. F. Johnson Co.; E. F. Johnson Company; E. F. Johnson Corporate Headquarters; E. F. Johnson Company Corporate Headquarters; E. F. Johnson Co. Corporate Headquarters. Angie Seidl Director at New London Public Museum in New London Wisconsin. According to Bruce Hering of Waseca, the artifacts are Radio Transmitting Tubes. "In the past they were used for low power radio transmitters for the AM Broadcast stations or Amateur radio transmitters (HAMS). Because this tube was widely used by the military during World War II, this is where E.F. Johnson Company fits in. Edgar manufactured the ceramic tube sockets that were used by this type of transmitting tubes. These items appear to be around 1940s and most likely were removed from a piece of WW II military surplus equipment."