U.S. Navy / GE type SE-1605-B RF-AF amplifier
date: label: date made
content: 1918
label: associated date
content: 1918
name: label: maker
content: General Electric Company
notes: label: Description (Brief)
content: Marked: "Radio-Audio Frequency / Amplifier / (6 step) / Range: 600-2300 Meters / Made for Navy Dept. (Bu.S.E.) / by / General Electric Co., U.S.A. / 1918 / Type SE.1605.B Serial No. 232 G"; also: "R1762". Unit is a RF-AF amplifier and detector employed by Lowell and Dunmore in their early experiments with alternating current receivers at the Bureau of Standards. The 1605-B was also employed with the French multiple tuner (catalog number 321934) as the RF tuning section. A loop antenna-variable capacitor combination was also used as the tuner on occasion. The circuitry is essentially a 3-stage RF amplifier followed by a grid-leak detector and two transformer-coupled audio stages. Moorhead triodes were apparently used in Navy type sockets. Two filament rheostats and a stabilizer control are provided on the panel. Lid has 3 screens for observing tube filaments. Reference: Clark Collection SRM 51-166, Wiring Diagram and Picture. US Patent Office: "Record and Testimony on Behalf of Lowell and Dunmore" (1928), pages 548-549, 500-501.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from John B. Brady, thru Mrs. John B. Brady
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.321932
label: catalog number
content: 321932
label: accession number
content: 245709
label: collector/donor number
content: R1762
objectType: label: Object Name
content: Amplifier
label: Object Name
content: radio amplifier
label: Other Terms
content: Amplifier; Radio
physicalDescription: label: Measurements
content: overall: 8 3/4 in x 13 in x 5 3/4 in; 22.225 cm x 33.02 cm x 14.605 cm