Grebe type RORN radio frequency amplifier
date: label: date made
content: ca 1922
name: label: maker
content: A. H. Grebe & Co.
notes: label: Description (Brief)
content: Marked: "Grebe Radio / Richmond Hill, N.Y. / Type RORN / Tuned Radio Amplifier / 150 to 3000 M. / Serial No. 129." Plate: "Manufactured Under Grebe Patents Granted and Pending." Specimen is an early example of an RF amplifier designed to precede the detector stage of a radio receiver. A tuned antenna input circuit is employed, with a variable capacitor and a multi-point switch varying antenna coil inductance. The plate circuit is tuned with a variable capacitor labeled condenser No. 2. Four sets of plug in tank coils are provided. A filament rheostat is located in the front panel. Allied Van Lines shipping label #22 on front panel. Reference: "Grebe Catalog," undated, pages 18-21. G.J. Gary, "The Grebe Story", p. 4.
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.320997
label: catalog number
content: 320997
label: accession number
content: 241556
objectType: label: Object Name
content: radio amplifier
label: Object Name
content: audio amplifier
physicalDescription: label: Measurements
content: overall: 7 1/8 in x 17 in x 7 3/8 in; 18.0975 cm x 43.18 cm x 18.7325 cm