Western Electric type VT2 radio tube
date: label: date made
content: ca 1917
name: label: maker
content: Western Electric
notes: label: Description (Brief)
content: Donor card reads: "Triode made by Western Electric Company for the US government in World War 1. Derived from the 205 design.... A five watt transmitting tube widely used in various government services for the first practical low-powered radio telephone transmitters. Used as both oscillators and modulators in the conventional Hartley-Heising circuit of that period. Many were sold as surplus after WWI. Oxide coated filament, 1.35 amperes at 6 to 7.5 volts, [they] would take as much as 450 volts in the plate circuit. Has the usual Western Electric special "Shaw" base. Known as the "WE-205-A" and was so made until 1924 when it was superceded by the "WE-205-B". The VT-2 was given the US Navy designation CW-931 and was known as a type "E" telephone repeater tube. Amplification factor .7, plate impedance 3000 to 4500 ohms, 35 to 45 MA plate current."
label: Description (Brief)
content: Brass 4-pin base (gold tips on tines) with bakelite insulator, two plates and grids with one emitter. Tipped G-shaped envelope. Stamped on the shell: "Signal Corps / VT2 / Western / Electric Co. Inc. / Pat. in U.S.A. / 1-15-07 Two patents / 2-18-03 4-27-15 / 12-19-16 / Pat. Applied For". Reference: Tyne, "Saga of the Vacuum Tube" 100-103, 286-287; https://www.radiomuseum.org/tubes/tube_vt2.html.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Paul G. Watson
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.324307
label: catalog number
content: 324307
label: accession number
content: 252994
objectType: label: Object Name
content: Electron Tube, Triode
label: Object Name
content: triode
label: Other Terms
content: Electron Tube, Triode; Electron Tubes
physicalDescription: label: Measurements
content: overall: 4 1/4 in x 2 1/4 in; 10.795 cm x 5.715 cm