Moorhead / De Forest type ER triode
date: label: date made
content: ca 1920
name: label: maker
content: Moorhead Laboratories
notes: label: Description (Brief)
content: Moorhead laboratories "Electron Relay" or ER tube. A 4-pin base with brass shell, plastic insulator, tipped T-shaped envelope. Glossy anode. "S" molded on base insulator. Stamped on envelope: "Licensed for amateur / or experimental use only / ER 534132"; on base shell: "De Forest Audion / U.S. Patent Nos. 841387-879532 / Sold only for amateur / and experimental use / Marconi / Trade Mark / Fleming Patent No. 803684". Reference: Tyne, "Saga of the Vacuum Tube," page 174-176.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Peter N. Borsi
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.327930
label: catalog number
content: 327930
label: accession number
content: 267757
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 2 in; 10.795 cm x 5.08 cm