Moorhead / De Forest type ER triode
date: label: date made
content: ca 1920
name: label: associated user
content: unknown
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. Dull-sheen anode. Stamped on base: "De Forest Audion / U.S. Patent Nos. 844387-7[....] / Sold only for Amat[eur] / and Experiment[al use.]" On envelope: "Licensed for Amateur & / Experimental use only. / ER 544854". 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 Franklin Wingard
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.322862
label: catalog number
content: 322862
label: accession number
content: 241556
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 1/8 in x 1 3/4 in; 10.4775 cm x 4.445 cm