Rare!!! Western Electric 639A 1930s Birdcage Mic
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639A is a Cardioid Directional Microphone
The 639-type Microphone is a general purpose magnetic microphone with directional characteristics which are selectable by means of a switch. The three basic patterns available are non-directional, figure eight, and cardioid.
Sensitivity
The 639A open circuit output level is 84 dB below 1 volt/dyne/cm², 64 dB below 1 volt/10 dynes/cm².
Power Output Level
–56 dBm for a sound pressure level (SPL) of 10 dynes per square centimeter, or –76 dBm for 1 dyne per square centimeter when the microphone is terminated with a resistance equal to its internal impedance. Experience indicates that the sound pressure produced at conversational level three feet from a microphone approaches 10 dynes/cm².
This beautiful mic sounds amazing, and has been housed in an upgraded bird cage, as unfortunately with a mic that is approximately 90 years old, the cages do suffer from wear and tear...
Reach out if you have any questions...
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| Listed | 8 days ago |
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| Condition | Very Good (Used) Very Good items may show a few slight marks or scratches but are fully functional and in overall great shape.Learn more |
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