EIMAC type 4-400A tetrode
date: label: date made
content: ca 1955
name: label: maker
content: Eimac
notes: label: Description (Brief)
content: A 5-pin perforated metal base with top contact, cylindrical envelope. Stamped on envelope: “Eimac / 4-400A / Made in U.S.A.” Donor’s card reads: “Tetrode made by Eitel-McCullough Inc. of San Carlos, California. These tubes have a consumer price of $48.00 each in 1961. Transmitting type, used mostly as output tubes in small broadcast stations and by amateurs in push-pull circuits giving about 1 kilowatt of power. Filament: 5 volts at 14.5 amperes, 4000 volts at 350 milliamperes on the plate, 600 volts on the screen, and 10 volt maximum grid drive for full capacity.” See also: https://www.radiomuseum.org/tubes/tube_4-400a.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.324538
label: catalog number
content: 324538
label: accession number
content: 252994
objectType: label: Object Name
content: Electron Tube
label: Object Name
content: tetrode
label: Other Terms
content: Electron Tube; Electron Tubes
physicalDescription: label: Measurements
content: overall: 6 1/4 in x 3 1/2 in; 15.875 cm x 8.89 cm