De Forest spherical "UltraAudion" radio tube
name: label: associated person
content: De Forest, Lee
label: maker
content: De Forest Radio Telephone & Telegraph Co.
notes: label: Description (Brief)
content: Donor card reads: "One of the first tubes made specifically for transmission. An enlargement of the double audion, this was one of the first relatively heavy current oscillators made for that purpose, and was used in the De Forest "Ultra Audion" circuit to produce oscillation. Hudson-type filament, 12 volts." Brass candelabra screw base with glass insulator, cloth insulated leads.
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.324302
label: catalog number
content: 324302
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: 4 in x 2 1/2 in; 10.16 cm x 6.35 cm