National Radio Tube type R81 "Rectobulb"
name: label: maker
content: National Radio Tube Company
notes: label: Description (Brief)
content: National Radio Tube Co. type R-81 "Rectobulb". A half-wave vacuum rectifier. Marked: "National / R 81 / Rectobulb". A plastic base with 4 pins. Metal sleeve wrapped around stem holds the internal structure. Paper label: "National Radio / Tube Co." May also be referred to as a UX281 tube. Reference: https://www.radiomuseum.org/tubes/tube_ux281.html, and Tyne, "Saga of the Vacuum Tube," page 325.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Franklin Wingard
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.323291
label: catalog number
content: 323291
label: accession number
content: 241556
objectType: label: Object Name
content: Electron Tube, Diode
label: Object Name
content: diode
label: Object Name
content: rectifier
label: Other Terms
content: Electron Tube, Diode; Electron Tubes
physicalDescription: label: Measurements
content: overall: 5 in x 2 in; 12.7 cm x 5.08 cm