RCA KN-1B otherwise known as MI-12004 is a pressure operated microphone made in the 1950's by RCA. It is a multidirectional microphone below 3000Hz and Semidirectional when signal frequency is above 3000Hz.
250 ohms output impedance.
Effective output level: -57dB
Range: 75 - 9000Hz
Comes with RCA KS-5A stand pictured.
Pulled from a working environment, tested and works.
A001.4
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