Grebe type CR-9 radio receiver
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 CR-9 / 150-3000 M. / Serial No. 7753". Plate: "Licensed under Armstrong Patent no. 113149 Oct. 6, 1914. For Amateur or Experimental Use Only. Manufactured Under Grebe Patents granted and pending." Unit is a regenerative detector and two stage audio amplifier employing 201-A type tubes. 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 variometer rotor is connected in the plate circuit and used as a regeneration control. The type CR-9 was used for reception of CW or radiotelephony and the operator monitored either the detector or amplifier sages by using the appropriate jack. Original price: $130. Allied Van Lines shipping tag #24 on front panel. Reference: AH Grebe Catalog Sheet, "Short-Wave Regenerative Receivers," 1922. Clymer-Greenwood, page 146.
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.320948
label: catalog number
content: 320948
label: accession number
content: 241556
label: serial number
content: CR-9
label: patent number
content: 113149
objectType: label: Object Name
content: radio receiver
label: Object Name
content: receiver, radio
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