RCA / Cunningham type 22 sharp cutoff tetrode
date: label: date made
content: ca 1930
name: label: maker
content: Radio Corporation of America
notes: label: Description (Brief)
content: A 4-pin plastic base with top contact, mesh grid, domed envelope. Stamped on base: "RCA Cunningham / Radiotron"; on envelope: "22". Donor’s card reads: “Sharp cutoff tetrode made by the [Radio Corporation of America] for sale under the E.T. Cunningham sales arrangement. Glass type used as a radio frequency amplifier in dry battery operated radio receivers. This tube is the revised model of the type UX-222 [catalog number 324407], dating about 1930. Most generally used with an Amperite ballast resistor in conventional 6 volt battery operated receivers. Filament: 3.3 volts at .132 ampere.” See also: https://www.radiomuseum.org/tubes/tube_22.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.325131
label: catalog number
content: 325131
label: accession number
content: 252994
objectType: label: Object Name
content: Electron Tube
label: Object Name
content: tetrode
label: Other Terms
content: Electron Tube; Electron Tubes
physicalDescription: label: Measurements
content: overall: 5 in x 1 3/4 in; 12.7 cm x 4.445 cm