Moorhead / Marconi type VT "Amplifier-Oscillator" tube
date: label: date made
content: ca 1923
name: label: maker
content: Moorhead Laboratories
notes: label: Description (Brief)
content: Moorhead type VT-1 radio tube, brass base with 4 pins, tipped T-shaped envelope. Makers stamp "V.T.-213380" on envelope: "Marconi". Donor's card reads: "Triode made by the Moorhead Laboratories of San Francisco, whose original business ad been the making of electric lamps. In 1922, after the expiration of the Fleming valve patents, Moorhead made tubes of [this type] for both De Forest and Marconi, and also sold the tubes under his own name. This tube, mounted on a "Shaw" base and marked "VT" was probably one made for [Marconi]. Very high vacuum tubes, they were much better amplifiers and oscillators than detectors. Filament: 5 volts at 1 ampere. Ultimately the Moorhead Laboratories combined with the companies owned by Elmer T. Cunningham, i.e. the AudioTron Sales Company and Remler Manufacturing Co. By 1924 or 1925 the actual making of tubes by these companies had ceased, and Cunningham tubes were made by General Electric as duplicates of their corresponding numbers in the RCA line of tubes."
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.324327
label: catalog number
content: 324327
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 in x 1 3/4 in; 10.16 cm x 4.445 cm