General Electric / RCA type 861 screen grid power amplifier
date: label: date made
content: ca 1930
name: label: maker
content: Radio Corporation of America
label: maker
content: General Electric Company
notes: label: Description (Brief)
content: A large glass G-shaped tube with a metal pin and blade base, metal top cap, contact on one side arm and braided metal lead on the opposite side. Donor’s card reads: “Screen grid power amplifier made by the General Electric Company for the Radio Corporation of America. A very early production model of this tube, dating from the late 1920s or early 1930s. Production began in 1929. Superseded by the type 861 [catalog number 324988]. This tube was used in amateur station W3BBV, York, PA, as a Class C output amplifier with a 400 watt output. Thoriated tungsten filament: 11 volts at 10 amperes. For Class C radio frequency operation: plate 3000 volts at 300 milliamps, screen 750 volts, negative control grid bias 250 volts.” See also: https://www.radiomuseum.org/tubes/tube_861.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.324799
label: catalog number
content: 324799
label: accession number
content: 252994
objectType: label: Object Name
content: electron tube
label: Object Name
content: triode
label: Other Terms
content: Electron Tube, Triode; Electron Tubes
physicalDescription: label: Measurements
content: overall: 16 1/2 in x 13 in x 6 1/2 in; 41.91 cm x 33.02 cm x 16.51 cm