De Forest model O-T-3 "Midget Radiophone"
date: label: date made
content: ca 1921
name: label: maker
content: De Forest Radio Telephone & Telegraph Co.
notes: label: Description (Brief)
content: This is a transceiver employing three triode tubes of the De Forest VT type or general 201-A type. A schematic diagram was located only for the transmitter section. Unit is a modulated oscillator, with a microphone connected between the filament and one side of a modulation transformer. The receiver appears to be a detector and two stage audio amplifier. Two inductances are employed, and panel controls include multi-point switching and a condenser fan switch. Stamped: "Midget Radiophone / Type O-T-3 / De Forest Radio Tel. & Tel. Co., N.Y." Reference: Clark Radioana Collection: SRM-45-873-A, "Draftsman's Schematic Diagram" dated 2-2-21.
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.320785
label: catalog number
content: 320785
label: accession number
content: 241556
objectType: label: Object Name
content: Transmitter
label: Object Name
content: radio transmitter
label: Other Terms
content: Transmitter; Radio
physicalDescription: label: Measurements
content: overall: 9 in x 9 in x 6 3/4 in; 22.86 cm x 22.86 cm x 17.145 cm