Eveready Raytheon type ER222 screen grid tetrode
date: label: date made
content: ca 1928
name: label: maker
content: Eveready Raytheon
notes: label: Description (Brief)
content: A 4-pin plastic base with top contact, mesh grid, four-lobed press, S-shaped envelope. Stamped on base: "Eveready / Raytheon / ER 222". Reference: https://www.radiomuseum.org/tubes/tube_er222.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 Franklin Wingard
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.321260
label: catalog number
content: 321260
label: accession number
content: 241556
objectType: label: Object Name
content: tetrode
label: Object Name
content: vacuum tube
label: Other Terms
content: Electron Tube; Electron Tubes
physicalDescription: label: Measurements
content: overall: 5 in x 1 3/4 in; 12.7 cm x 4.445 cm