RCA MI-6203-C Lo Z Ribbon Microphone, sn 1464.
A working RCA Ribbon mic, All original, please read the full description for details.
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This is an RCA Ribbon mic, model MI-6203-C, Serial # 1464. RCA built this model with the same ribbon and magnet construction that they used in the more expensive RCA Type 77-D. Essentially it's a Model 77-D without a low cut switch, and the pattern control uses a spring held sliding fitting.
The cosmetics of this microphone are poor: the paint is flaking, internal fabric intact but faded and pulling away from the frame in spots, and the top sides of the case are slightly deformed.
The mic works perfectly, with no noise or hum. Inspection of the ribbon shows that is has retained its form.
"The desired directional response is selected by moving the adjustable slider on the back of the microphone case to any of the marked positions. The positions lettered P, U, and V refer to pressure, unidirectional and velocity operation respectively: the two intermediate positions are numbered 1 and 2. The directional characteristics are continuously variable and the slider may be stopped between any of the marked positions. Adjustment of the microphone will be determined by its location and the purpose for which it is used."