De Forest type 503A transmitting triode
date: label: date made
content: ca 1934
name: label: maker
content: De Forest Radio Telephone & Telegraph Co.
notes: label: Description (Brief)
content: An air-cooled transmitting triode. A 4-pin (short) brass base shell with ceramic insulator, T-shaped envelope. Stamped on base: "de Forest / Type 503-A / Licensed to extent / indicated on carton"; on envelope: "de Forest". Inked on stem: "@20", "m03A3", and "1123". Reference: https://www.radiomuseum.org/tubes/tube_503a.html.
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.323305
label: catalog number
content: 323305
label: accession number
content: 241556
objectType: label: Object Name
content: Electron Tube
label: Object Name
content: vacuum tube
label: Object Name
content: electron tube
label: Object Name
content: triode
physicalDescription: label: Measurements
content: overall: 7 1/4 in x 2 1/4 in; 18.415 cm x 5.715 cm