De Forest model D-7A radio receiver
date: label: date made
content: ca 1923
name: label: maker
content: De Forest Radio Telephone & Telegraph Co.
notes: label: Description (Brief)
content: Marked on front panel: "De Forest / Type D-7A". Inside plate: "Licensed under / Priess Amplifier Inventions / Patents pending." License information on sticker glued to bottom panel. This unit is a crystal detector with reflexing circuits. Three RF stages are employed ahead of the detector, with two tubes operating as dual audio amplifiers. Three DV-6 or UV-201 tubes are employed. Two principal tuning dials are used. This receiver sold for $175 in 1923. A loop antenna is normally plugged into top of unit. REF: "Langley Set Index", page 19. (Clark Collection: SRM-45-884-A) Operating Instructions for De Forest Radiophone Receiver D-7A, 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.320707
label: catalog number
content: 320707
label: accession number
content: 241556
objectType: label: Object Name
content: radio receiver
physicalDescription: label: Measurements
content: overall: 10 in x 10 in x 8 in; 25.4 cm x 25.4 cm x 20.32 cm