EIMAC type 4-125-A power tetrode
date: label: date made
content: ca 1945
name: label: maker
content: Eimac
notes: label: Description (Brief)
content: A 5-pin perforated metal base with top contact, T-shaped envelope. Stamped: “Eimac / 4-125A / Made in U.S.A.” Donor’s card reads: “Power tetrode made by Eitel-McCullough of San Carlos, California during and after World War II. For VHF service, frequencies up to 120 megacycles. Thoriated tungsten filament: 5 volts at 6.5 amperes. For Class C operation 2500 volts on the plates, 400 volts on the screen, 210 volt negative control grid bias will give 300 watts output, up to 120 megacycles.” See also: https://www.radiomuseum.org/tubes/tube_4%2D125a.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.324828
label: catalog number
content: 324828
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: 5 1/2 in x 2 3/4 in; 13.97 cm x 6.985 cm