U.S. Navy GE type SE-1605-B RF-AF amplifier

U.S. Navy / GE type SE-1605-B RF-AF amplifier

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Description (Brief)
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.
Location
Currently not on view
Object Name
Amplifier
radio amplifier
Other Terms
Amplifier; Radio
date made
1918
associated date
1918
maker
General Electric Company
Measurements
overall: 8 3/4 in x 13 in x 5 3/4 in; 22.225 cm x 33.02 cm x 14.605 cm
ID Number
EM.321932
catalog number
321932
accession number
245709
collector/donor number
R1762
Credit Line
from John B. Brady, thru Mrs. John B. Brady
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Work and Industry: Electricity
Data Source
National Museum of American History
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