Grebe type RORN radio amplifier
date: label: date made
content: ca 1922
name: label: maker
content: A. H. Grebe & Co.
notes: label: Description (Brief)
content: Marked: "Tuned Radio Amplifier / 150 to 3000 M / Serial No. 637 / Grebe Radio / Richmond Hill, N.Y. / Type RORN". Plate: Manufactured / under Grebe / Patents Granted / and Pending." Specimen is an early example of an RF amplified 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 on the front panel. Reference: G.J. Gray, "The Grebe Radio Story," ca. 1961, page 4. Grebe Catalog, undated, pages 18-21.
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.321083
label: catalog number
content: 321083
label: accession number
content: 241556
objectType: label: Object Name
content: radio receiver
label: Object Name
content: audio amplifier
physicalDescription: label: Measurements
content: overall: 7 1/4 in x 17 in x 7 1/2 in; 18.415 cm x 43.18 cm x 19.05 cm