National Union type 7-J-7 triode-heptode converter
name: label: maker
content: National Union Radio Corp.
notes: label: Description (Brief)
content: An 8-pin metal base with center post, T-shaped envelope. Stamped: “Made / in / U.S.A. / NU / National”. Donor’s card reads: “Triode-heptode converter made by the National Union Radio Company. Glass lock-in type. Used as a combination oscillator and heptode converter in superheterodyne radio receivers. Heater type: 6.3 volts at .3 ampere.” See also: https://www.radiomuseum.org/tubes/tube_7j7.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.325120
label: catalog number
content: 325120
label: accession number
content: 252994
objectType: label: Object Name
content: Electron Tube
label: Object Name
content: triode, heptode
label: Other Terms
content: Electron Tube; Electron Tubes
physicalDescription: label: Measurements
content: overall: 3 3/4 in x 1 1/4 in; 9.525 cm x 3.175 cm