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RCA Type 50A
This is an RCA ribbon/velocity microphone with an unknown polar response that was manufactured circa 1934.
RCA MI4010
This is an RCA ribbon/velocity microphone with a bi-directional polar response that was manufactured circa 1935.
RCA Type 74A
This is an RCA ribbon/velocity microphone with a bi-directional polar response that was manufactured circa 1936.
RCA Type 74B
This is an RCA ribbon/velocity microphone with a bi-directional polar response that was manufactured circa 1940.
RCA BK4A
This is an RCA ribbon/velocity microphone with a cardioid polar response. It was manufactured circa 1950.
RCA BK5B
This is an RCA ribbon/velocity microphone with a cardioid polar response. It was manufactured circa 1954.
RCA BK5A
This is an RCA ribbon/velocity microphone with a cardioid polar response. It was manufactured circa 1954.
RCA KB2A
This is an RCA ribbon/velocity microphone with a bi-directional polar response that was manufactured circa 1946.
RCA KB2C
This is an RCA ribbon/velocity microphone with a bi-directional polar response that was manufactured circa 1946.
RCA KB3A
This is an RCA ribbon/velocity microphone with a bi-directional polar response that was manufactured circa 1946.