National Union type 30 / VT-27 medium-Mu triode
date: label: date made
content: ca 1930
name: label: maker
content: National Union Radio Corp.
notes: label: Description (Brief)
content: A 4-pin plastic base with domed envelope. Base stamped: "National / Union / Made in U.S.A. / VT-2[7]"; on envelope: "30". Reference: https://www.radiomuseum.org/tubes/tube_30.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 the United States Bureau of Standards, Dept. of Commerce
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.320201
label: catalog number
content: 320201
label: accession number
content: 188571
objectType: label: Object Name
content: Electron Tube
label: Object Name
content: triode
label: Other Terms
content: Electron Tube; Electron Tubes
physicalDescription: label: Measurements
content: overall: 4 1/4 in x 1 1/2 in; 10.795 cm x 3.81 cm