"Sodion" type D21 gas triode
date: label: date made
content: 1924
name: label: maker
content: Connecticut Telephone & Electric Company
notes: label: Description (Brief)
content: "Sodion" type D-21 gas detector triode with a 4-pin plastic base, tipless T-shaped frosted envelope. Donor card reads: "A gas filled triode made in the early 1920s by Connecticut Telephone & Electric Company of Meriden, Conn. For use as a detector only. Filament 5 volts at .25 amperes. Anode voltage, 22.5 to 45 volts, grid leak 1/2 to 5 megohms, grid condenser .00025 to .0005 MFD. Filament should always be operated at the lowest possible voltage for satisfactory results, so that the glow in the tube is a bright yellow and never turned up to a brilliant white. Instructions say that an over-bright filament will reduce signals. Based to match the UV-200 and UV-201-A tube types of that period. One of the unusual tubes of the early 1920s when AM broadcasting was in its infancy. Used to a limited extent by amateurs in regenerative receivers, but caused some noise. Would oscillate with 45 volts on the plate in a conventional circuit."
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.324322
label: catalog number
content: 324322
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: 3 3/4 in x 1 1/4 in; 9.525 cm x 3.175 cm