RCA Duo-Rectron radio battery eliminator
date: label: date made
content: ca 1925
name: label: maker
content: RCA Corporation
notes: label: Description (Brief)
content: Marked: "Model AP-937 / Serial No. 101529 / DUO-RECTRON / Plate "B" Battery Eliminator / Input volts 110/125 Cycles 60 / Output Volts, DC-22 1/2, 45, 90, and 135 / 0.020 Amp on 90 Volt Tap / 0.010 Amp on 135 Volt Tap / 0.050 Amp on 90 and 135 Volt / Taps in Parallel / [License Notice follows] / Patented Aug 22,1916, Dec 25, 1917 / Radio Corporation of America." Specimen in an early example of a commercial "B" battery eliminator. A UX-874 voltage regulator tube is utilized as well as a UX-213 full wave rectifier tube (missing). Voltage terminals on the rear panel permit tapping of battery voltages at 22.5, 45, 90 and 135 volts simultaneously. Power drawn from 110 volt house lighting circuit is approximately 30 watts. Reference: Data sheet - DUO-RECTRON Model AP-937, 1925. Clark Collection CL 45.
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.321020
label: catalog number
content: 321020
label: accession number
content: 241556
label: serial number
content: 101529
objectType: label: Object Name
content: rectifier
label: Object Name
content: power supply
physicalDescription: label: Measurements
content: overall: 7 1/4 in x 17 1/2 in x 8 1/2 in; 18.415 cm x 44.45 cm x 21.59 cm