GE / RCA / Cunningham type 2-B-7 “Radiotron” duplex diode-pentode
date: label: date made
content: ca 1932
name: label: maker
content: General Electric Company
notes: label: Description (Brief)
content: A 6-pin plastic base, top contact, domed glass envelope. Stamped: “[RCA logo] Cunningham / Radiotron”, on envelope: “Made / 2B7 / in U.S.A.” Donor’s card reads: “Duplex diode-pentode made by the General Electric Company for the RCA / Cunningham distribution arrangement in the early 1930s. Heater type: 2.5 volts at .8 ampere, in which the diode units may be used as AVC or detector, wile the pentode unit is used for either radio frequency or audio frequency amplification."
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.324989
label: catalog number
content: 324989
label: accession number
content: 252994
objectType: label: Object Name
content: Electron Tube
label: Object Name
content: vacuum tube
label: Object Name
content: pentode
label: Other Terms
content: Electron Tube; Electron Tubes
physicalDescription: label: Measurements
content: overall: 4 1/2 in x 1 1/2 in; 11.43 cm x 3.81 cm