De Forest / U.S. Navy type CF-122A Audion control box
date: label: date made
content: 1918
label: associated date
content: 1918
name: label: maker
content: De Forest Radio Telephone & Telegraph Co.
label: maker
content: Splitdorf Electric Co.
label: maker
content: Splitdorf Electric Co.
notes: label: Description (Brief)
content: Marked: "Control box for detector, oscillator and amplifier Audion type, Made for Bureau of Steam Engineering by De Forest Radio Tel & Tel Co., NY. Req. #1310. Cont. #35491. Date 1918. A battery volts: 6; B battery volts: .25[?]; Fil. Current: .2-.9 Class _____. Serial No. 521". On meter: "1.5-0-1.5 amp scale. Pat. 6/1/15; Ser No 30246. Made by Splitdorf Elec. Co., Newark, N.J." Specimen employs a single triode vacuum tube in a circuit which can be adjusted for use as a detector, oscillator, or amplifier. This model was superceded by the SE1071 (see EM.320729). Panel has a function switch for the desired mode of operation, also a 10-tap bridging condenser and stopping condenser, a meter calibrated to 1.5 amps, filament current and B voltage rheostats, an edge type meter with 0-10 calibration, corrugated insulators with binding posts for headphones, B battery, 125 volt line, A battery, and tickler. Reference: Navy type numbers, 1918, page 7. (Clark Collection); U.S. Navy: Audion Control Box 122-A, Instructions. (Clark Collection: Class 50- book 2, Detectors).
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.321422
label: catalog number
content: 321422
label: accession number
content: 241556
objectType: label: Object Name
content: Amplifier/Detector
label: Object Name
content: radio receiver
label: Other Terms
content: Amplifier/Detector; Radio
physicalDescription: label: Measurements
content: overall: 13 1/8 in x 11 5/8 in x 8 3/4 in; 33.3375 cm x 29.5275 cm x 22.225 cm