Grebe type CR-3 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-3 / Grebe Special / 150 to 1000 M. / Serial No. 296." Plate: "Licensed Under Armstrong Patent No. 1113149, Oct. 6, 1914, For Amateur or Experimental Use Only. Manufactured Under Grebe Patents Granted and Pending." Regenerative receiver, though the tube circuit is external and connected to binding posts on the front panel. Internal circuitry consists essentially of three variometer coils. One coil serves as the antenna coil with two sets of multi-point switches (one scale 0-12 and one 0-60). Variable coupling is provided. One coil serves as grid variometer and another as the regeneration control. Appropriate binding posts are on front panel. Reference: Grebe Catalog, undated, page 5. F. D. Pitts catalog, 1922, pages 42-43. (150-680 meter set is illustrated).
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.320995
label: catalog number
content: 320995
label: accession number
content: 241556
label: patent number
content: 1113149
objectType: label: Object Name
content: radio receiver
physicalDescription: label: Measurements
content: overall: 7 1/8 in x 19 1/2 in x 7 1/2 in; 18.0975 cm x 49.53 cm x 19.05 cm