De Forest / Moorhead type AP "Atlantic-Pacific" rectifier tube
date: label: date made
content: ca 1921
name: label: associated user
content: unknown
label: maker
content: De Forest Radio Telephone & Telegraph Co.
notes: label: Description (Brief)
content: A 4-pin base with brass shell, plastic insulator, tipped G-shaped envelope with neck. "S" molded on base insulator, "344" stamped on envelope; "De Forest / U.S. Patent Nos. 841387-879532 / Sold only for amateur / and experimental use". Earlier version of the AP rectifier shows open grid and filament structure. Reference: Tyne, "Saga of the Vacuum Tube," page 176-178.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Franklin Wingard
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.322850
label: catalog number
content: 322850
label: accession number
content: 241556
objectType: label: Object Name
content: Electron Tube, Triode
label: Object Name
content: triode
label: Object Name
content: rectifier
label: Other Terms
content: Electron Tube, Triode; Electron Tubes
physicalDescription: label: Measurements
content: overall: 5 5/8 in x 2 1/4 in; 14.2875 cm x 5.715 cm