McCandless / De Forest spherical "Audion" radio tube
date: label: date made
content: 1908
label: associated date
content: 1908
name: label: associated person
content: De Forest, Lee
label: maker
content: De Forest Radio Telephone & Telegraph Co.
label: maker
content: H. W. McCandless & Company
notes: label: Description (Brief)
content: Donor card: "Spherical single element audion tube made by H. W. McCandless for Lee De Forest about 1908. A fiber cap on grid and plate end of tube. 3.5 volt tungsten filament. Referred to in De Forest letter of 22 April 1954 as tube #4." Brass candelabra screw base with glass insulator, two filaments, separate leads set in a plastic cap. Cloth insulation.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Paul G. Watson
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.324290
label: catalog number
content: 324290
label: accession number
content: 252994
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: 3 3/4 in x 2 in; 9.525 cm x 5.08 cm