Western Electric type 231D triode
date: label: date made
content: 1931
name: label: maker
content: Western Electric
notes: label: Description (Brief)
content: A 4-pin base with tipped, T-shaped envelope. Markings: "Western Electric / 231-D / Made in U.S.A."; 3940 scratched in base. "The No. 231D vacuum tube is a three-element filament type tube for use as an audio frequency amplifier." Reference: https://www.westernelectric.com/s/231D.pdf; and Tyne, "Saga of the Vacuum Tube," pages 295, 297.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from the United States Bureau of Standards, Dept. of Commerce
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.320222
label: catalog number
content: 320222
label: accession number
content: 188571
label: model number
content: 231-D
objectType: label: Object Name
content: triode
label: Object Name
content: vacuum tube
label: Other Terms
content: Electron Tube; Electron Tubes
physicalDescription: label: Measurements
content: overall: 3 3/4 in x 1 1/8 in; 9.525 cm x 2.8575 cm