Triad medium Mu triode
date: label: date made
content: ca 1929
name: label: maker
content: Triad Manufacturing Company, Inc.
notes: label: Description (Brief)
content: A plastic 4-pin base with tipless T-shaped envelope, silvered. Stamped on base: "Triad / Made in U.S.A."; paper label printed: "40". Donor's card reads: "Triode made by Triad Television & Mfg. Co., of Pawtucket, R.I. about 1928 or 1930. Considered at the time to be of "bootleg" origin [ie. unlicensed] and of very questionable quality. Used as a resistance or impedance coupled amplifiers in battery operated radio receivers. Filament: 5 volts at .25 amperes. Maximum plate voltage 180, 3 volts maximum negative control grid bias." See also: https://www.radiomuseum.org/dsp_hersteller_detail.cfm?company_id=7209 which cites Tyne, "Saga of the Vacuum Tube", page 364 and saying that Triad was licensed by RCA, so Watson's recollection may have been rumor, or perhaps the company later took a license.
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.324391
label: catalog number
content: 324391
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: 4 1/4 in x 1 1/4 in; 10.795 cm x 3.175 cm