Western Electric type 247A vacuum triode
date: label: date made
content: ca 1930
name: label: maker
content: Western Electric
notes: label: Description (Brief)
content: A 5-pin plastic base with circular mesh plate. AC filament type. S-shaped envelope. Markings: "Western Electric / Made in U.S.A. / 247-A". "The No. 247A Vacuum Tube is a general purpose tube having an indirectly heated cathode which permits operation of the heater element directly on alternating current. The tube is for use as an audio-frequency amplifier in intermediate stages but may also be used satisfactorily as a detector or as a power amplifier tube for applications requiring small values of output power." Reference: https://www.westernelectric.com/s/247A.pdf; Tyne, "Saga of the Vacuum Tube," page 299.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Franklin Wingard
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.322710
label: catalog number
content: 322710
label: accession number
content: 241556
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: 4 3/8 in x 1 3/4 in; 11.1125 cm x 4.445 cm