Grebe type CR-9 radio receiver
date: label: date made
content: 1922
name: label: maker
content: A. H. Grebe & Co.
notes: label: Description (Brief)
content: Marked on panel: "Grebe Radio / Richmond Hill, N.Y. / Type CR-9 / 150-3000 M. / Serial No. 981." On plate: "Licensed under Armstrong Patent No. 1113149, Oct. 6, 1914 for Amateur or Experimental Use Only. Manufactured Under Grebe Patents Granted and Pending." A regenerative detector and two stage audio amplifier. Tuning is accomplished by means of an antenna series condenser used in conjunction with a twelve-section triple-bank-wound inductance connected in series with the stator windings of a variometer. The rotor of this variometer is used in the plate circuit as a regeneration control. Panel controls include detector and amplifier monitoring jacks. Reference: Grebe Catalog, "Short Wave Regenerative Receivers," 1922.
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.321292
label: catalog number
content: 321292
label: accession number
content: 241556
objectType: label: Object Name
content: radio receiver
physicalDescription: label: Measurements
content: overall: 7 in x 22 3/4 in x 7 1/2 in; 17.78 cm x 57.785 cm x 19.05 cm