RCA / NBC "camera box" condenser microphone
date: label: Date made
content: ca 1928
name: label: maker
content: RCA Corporation
notes: label: Description
content: RCA / NBC "camera box" condenser microphone on stand with cord and plug. Condenser microphone with three stages of amplification made possible by development of vacuum tubes free of operation noises. Transmits all sound frequencies registered at the microphone diaphragm. High cost of maintenance of three stages of amplification in the case made other microphone types more desirable. Black metal cube on short stand and base. Nameplate: RCA model AA4088, serial no. 3106. Cord and plug attached.
setName: label: See more items in
content: Work and Industry: Electricity
label: Exhibition
content: The Electric Dr. Franklin
label: Exhibition Location
content: National Museum of American History
creditLine: label: Credit Line
content: from National Broadcasting Company, Inc.
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.311448
label: catalog number
content: 311448
label: accession number
content: 148157
label: model number
content: AA4088
label: serial number
content: 3106
objectType: label: Object Name
content: Microphone
label: Object Name
content: condenser microphone
label: Other Terms
content: Microphone; Audio Devices
physicalDescription: label: Measurements
content: overall: 14 1/2 in x 6 in x 6 in; 36.83 cm x 15.24 cm x 15.24 cm