Atlantic Pacific electron relay
date: label: date made
content: ca 1920
name: label: maker
content: Atlantic Pacific Radio Supplies Company
notes: label: Description (Brief)
content: An electron relay having a brass base with 4 pins, and a tipped T-shaped envelope. Donor's card reads: "Triode made by the Atlantic Pacific Radio Supplies Company, 638 Mission Street, San Francisco, about 1920 or 1921. Made under and in arrangement with De Forest and Marconi interests. This tube has elements exactly like those found in an AudioTron tube [catalog number 324315] and is the original model of "Electron Relay." De Forest states on page 354 of "Father of Radio" that in March 1920 he began collaboration wit Henry M. Shaw, president of Atlantic Pacific, and it seems that these tubes resulted. Shaw was the inventor of the 4-pin base which bears his name. The Electron Relay is a very "soft" tube, requiring variable "B" [battery] voltage, from 18 to 30 volts, and was a very sensitive regenerative detector for spark signals. Filament: 5 volts, 1 ampere."
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.324330
label: catalog number
content: 324330
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