Western Electric type 212A transmitting triode
date: label: date made
content: ca 1923
name: label: maker
content: Western Electric
notes: label: Description (Brief)
content: An air-cooled transmitting triode. Four brass pin base with plated shell, plastic insulator. Fiber stem insulators. Tipped T-shaped envelope. Stamped on envelope: "245845 B"; on base: "Western Electric / Made in U.S.A. / 212A / Patd. U.S.A. / 1-15-07 / 2-18-08 / 3-27-15 / 12-19-16 / 12-17-18 / 5-13-19 / 6-24-19 / 1-27-20 / 6-13-22 / Pats. Appd For"; handwritten: "OSC Dec 19 / + [under tape residue] / Mod #2 / ok / Nov 12 / F / bad oscillation NRM[?] changed April [crossed thru?]". References: Tyne, "Saga of the Vacuum Tube," pages 289-291.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.323155
label: catalog number
content: 323155
label: accession number
content: 250988
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: 13 1/4 in x 3 1/2 in; 33.655 cm x 8.89 cm