Western Electric type 247A vacuum triode
name: label: maker
content: Western Electric
notes: label: Description (Brief)
content: A 5-pin plastic base with cylindrical plate. AC filament type. S-shaped envelope. Markings: "Western Electric / Made in U.S.A. / 247-A". This tube features a solid plate rather than a grid mesh seen on catalog number 322710. "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
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: ZZ.RSN80515U02
objectType: label: Object Name
content: Electron Tube
label: Object Name
content: triode
label: Other Terms
content: Electron Tube; Electron Tubes
physicalDescription: label: Physical Description
content: composition (overall material)
label: Physical Description
content: glass (overall material)
label: Physical Description
content: metal (overall material)
label: Measurements
content: electron tube: 11 cm x 4 cm; 4 5/16 in x 1 9/16 in
label: Measurements
content: overall: 4 3/8 in x 1 3/4 in; 11.1125 cm x 4.445 cm