De Forest spherical "Ultraudion" radio tube
date: label: date made
content: ca 1910
name: label: maker
content: De Forest Radio Telephone & Telegraph Co.
notes: label: Description (Brief)
content: Marked: "Ultraudion (/) 6 volts (/) hudson filament (/) patented Feb. 18, 1908". An Ultraudion triode with spherical envelope, candelabra-screw base, and two filaments, grids, and plates. Reference: Tyne, "Saga of the Vacuum Tube," pages 52-72, 119-121.
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.320905
label: catalog number
content: 320905
label: accession number
content: 241556
objectType: label: Object Name
content: Electron Tube
label: Object Name
content: triode
label: Other Terms
content: Electron Tube; Electron Tubes
physicalDescription: label: Measurements
content: overall: 3 1/4 in x 2 in; 8.255 cm x 5.08 cm