Western Electric type 211E transmitting triode
date: label: date made
content: ca 1922
name: label: maker
content: Western Electric
notes: label: Description (Brief)
content: An air-cooled transmitting triode with a 4-pin plastic base with tipped T-shaped envelope. Donor’s card reads: “Triode made by the Western Electric Company for use in their first commercial 500 watt broadcast equipment. Used as an audio amplifier to feed the two type 212-D modulator tubes in the transmitter. Subsequently they found their way into the output stages of audio amplifiers in theaters as talking pictures were introduced. Oxide coated filament, 10 volts at 3 amperes, 1000 volts on the plate and a 90 volt negative grid bias was obtained in early transmitters from dry-cell batteries. This tube was not legitimately available to amateurs for many years, however a few had them and found them unsatisfactory when used in radio frequency circuits. First developed after World Ward I as the type G tube. The E model was introduced as an audio amplifier.” See also: https://www.radiomuseum.org/tubes/tube_211e.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.324550
label: catalog number
content: 324550
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: 7 1/2 in x 2 in; 19.05 cm x 5.08 cm