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 tipless, T-shaped envelope. Markings: "Western Electric / Made in U.S.A. / 231-D". Two paper labels: one reads: "Tube #13 / Placed 4/15/31 / N.Y. State / WOR 2-2911 [crossed thru] POS11 / COR 7-9806"; second label reads: "Tube #13 / Test Def. 6/16/31." "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 Weston Electrical Instrument Corp., thru John H. Miller
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.313291
label: catalog number
content: 313291
label: accession number
content: 181342
label: catalog number
content: 319291
label: model number
content: 231d
objectType: label: Object Name
content: triode
label: Object Name
content: vacuum tube
label: Object Name
content: Electron Tube
physicalDescription: label: Measurements
content: overall: 3 5/8 in x 1 1/8 in; 9.2075 cm x 2.8575 cm