General Electric type UX226 "Radiotron" vacuum triode
date: label: date made
content: ca 1927
name: label: maker
content: General Electric Company
notes: label: Description (Brief)
content: An audio frequency vacuum triode. A 4-pin plastic base with tipless S-shaped envelope, partly silvered. Stamped on base: "RCA / Radiotron / UX226". Donor’s card reads: “Triode made by the General Electric Company for the Radio Corporation of America in 1926 to 1927 for use in the audio stages of early AC operated radio receivers. It was found that a very low voltage high current filament produced less hum from the auto-biasing reversal of the AC filaments than did other combinations. Some attempt was made to use these tubes as radio frequency amplifiers and detectors, but the results were of little value. Heater type tubes of the UX-227 type became the popular radio frequency and detector tubes for AC operation, with the 226 sometimes used in the audio stages. Oxide coated filament 1.5 volts at 1.05 amperes, 180 volts maximum on the plate with a 14.5 volt negative grid bias. This tube was first advertised for sale in Radiola 17 receivers in September 1927. See also: Tyne, "Saga of the Vacuum Tube," page 319; https://www.radiomuseum.org/tubes/tube_ux226.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 Paul G. Watson
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.324420
label: catalog number
content: 324420
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 1/2 in x 1 3/4 in; 11.43 cm x 4.445 cm