Hygrade Sylvania type 7A4 vacuum triode
date: label: date made
content: ca 1939
name: label: associated user
content: unknown
label: maker
content: Hygrade Sylvania Corp.
notes: label: Description (Brief)
content: A 8-pin metal base with center post, getter flash, T-shaped envelope. Paper label reads: “Hygrade Sylvania Corp. / [no data filled in] / Experimental tube -- not to be sold". Stamped on envelope: "7A4". Reference: https://www.radiomuseum.org/tubes/tube_7a4.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 Susan Horle
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.313922
label: catalog number
content: 313922
label: accession number
content: 195337
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: 2 3/4 in x 1 1/8 in; 6.985 cm x 2.8575 cm