RCA NBC "bullet" condenser microphone
RCA / NBC "bullet" condenser microphone
Usage conditions apply
- Description
- RCA / NBC condenser microphone. Vertical cylindrical case, cone tope, gauze covered opening at side marked NBC, marked: VIII on bottom, cord attached. A thin, tightly stretched diaphragm of aluminum alloy, spaced 2/1000 inch from flat brass disc form a condenser. The diaphragm, moved by sound waves, varies the capacity of the condenser. Electrical output is feeble but registers faithfully a wider range of input sound, free of the noise evident in carbon microphones. First used regularly in 1925, limited use to 1938. Required amplification close to microphone, but only two stages were feasible at the time.
- Location
- Currently not on view
- Object Name
- condenser microphone
- radio microphone
- microphone
- Other Terms
- condenser microphone; Audio Devices
- date made
- 1925
- maker
- RCA Corporation
- Measurements
- overall: 8 3/4 in x 4 in x 5 in; 22.225 cm x 10.16 cm x 12.7 cm
- ID Number
- EM.311447
- catalog number
- 311447
- accession number
- 148157
- Credit Line
- from National Broadcasting Company, Inc.
- See more items in
- Work and Industry: Electricity
- Data Source
- National Museum of American History
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