Connecticut type D-11-1 radio amplifier
date: label: date made
content: 1920
name: label: maker
content: Connecticut Telephone & Electric Company
notes: label: Description (Brief)
content: Marked on label: "Connecticut Radio / Type D-11 / Amplifier Unit / Pat. July 13, 1920". On plate: "Audio Amplifier / Type D-11-1 / Made in U.S.A. by / Connecticut Telephone & Electric Company". An early commercial audio amplifier unit employing a UV-199 triode. Binding posts for battery and input-output connections are located on bakelite base. A type J-121 Connecticut audio transformer couples the input circuit to the amplifier. Three dry cell batteries are normally used to supply filament voltage, though two cells from a storage battery will give the same voltage.
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.321317
label: accession number
content: 241556
label: catalog number
content: 321317
objectType: label: Object Name
content: radio amplifier
physicalDescription: label: Measurements
content: overall: 4 in x 2 7/8 in x 5 7/8 in; 10.16 cm x 7.3025 cm x 14.9225 cm