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RCA 77C1
This is an RCA ribbon/velocity microphone with a bi-directional polar response that was manufactured circa 1940.
RCA 77D
This is an RCA ribbon/velocity microphone with a bi-directional polar response that was manufactured circa 1945.
RCA 77DX
This is an RCA ribbon/velocity microphone with a bi-directional polar response that was manufactured circa 1954.
RCA BK6A
This is an RCA dynamic/moving coil microphone with a cardioid polar response manufactured circa 1954.
RCA BK6B
This is an RCA dynamic/moving coil microphone with a cardioid response that was manufactured in 1956.
RCA BK11
This is an RCA ribbon/velocity microphone with a bi-directional polar response that was manufactured circa 1960.
RCA MI12022
This is an RCA dynamic/moving coil microphone with a cardioid response and an uknown date of manufacture.
RCA BK14A
This is an RCA dynamic/moving coil microphone with an omni-directional polar response that was manufactured circa 1969. Microphone is on left in this image.
RCA BK16A
This is an RCA dynamic/moving coil microphone with an omni-directional polar response and an unknown date of manufacture. In this image, it is the microphone on the left.
RCA BTP1A
This is an RCA crystal/piezoelectric microphone with an unknown polar response and unknown date of manufacture.