General Electric type 204-A triode
date: label: date made
content: ca 1924
name: label: maker
content: General Electric Company
notes: label: Description (Brief)
content: A large glass tube with metal 2-pin and plate base, top cap with contact, BT-shaped envelope. No extant markings. Donor’s card reads: “Triode made by the General Electric Company for the Radio Corporation of America in the 1920s. This is the first A model of the original 204 design [catalog number 324352]. Similarly, an improved model with a carbon plate is [catalog number 324494]. Just as the 212-D Western Electric tube was the mainstay of commercially made broadcast transmitters, so the 204-A was used in the many composite home-built broadcast stations. Used singly as a modulator or oscillator for a 250 watt output, or two in parallel for a 500 watt output in the conventional (of the period) Hartley-Heising or Colpitts-Heising circuits. Used on frequencies up to 3 megacycles. Filament: 11 volts at 3.85 amperes, plate operates at 2500 volts and 275 ma, for an output of 350 watts."
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.324552
label: catalog number
content: 324552
label: accession number
content: 252994
objectType: label: Object Name
content: Electron Tube, Triode
label: Object Name
content: triode
label: Other Terms
content: Electron Tube, Triode; Electron Tubes
physicalDescription: label: Measurements
content: overall: 14 in x 4 in; 35.56 cm x 10.16 cm