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Microphones → Vintage RCA 77DX poly-directional ribbon mic

Vintage RCA 77DX poly-directional ribbon mic
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Vintage RCA 77DX poly-directional ribbon mic
Item# 77DX

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Vintage RC77 DX in TV grey, small dent on back side of wind screen, includes 24" cable terminated in male XLR. General information: The RCA Type 77-DX Poly-directional Microphones MI-4045-F and MI-11006-C are high-fidelity micro­phones of the ribbon type which may easily be adjusted to obtain a variety of directional patterns. Since the MI-4045-F micro­phone is primarily intended for broadcast use, it is finished in satin chrome and a low-gloss umber-gray enamel. The MI-11006-C micro­phone is intended for television use and is therefore com­pletely finished in a low-gloss umber-gray enamel which eliminates glaring reflections usually seen on highly polished micro­phones. Instead of being open on both sides as in the conventional velocity mi­crophone, the ribbon element in this micro­phone is coupled to an acoustic labyrinth which forms the body portion of the micro­phone. The tube connecting the back of the ribbon to the labyrinth is slotted directly behind the ribbon and fitted with an adjustable shutter to secure various areas of opening. When the opening is completely closed, the micro­phone operates as a non-directional pressure micro­phone; at the wide-open position the micro­phone becomes bi-directional. With the proper size opening the pattern becomes a cardioid by virtue of the phase shift which occurs. Openings smaller or larger than this critical size produce directional patterns with various sized rear lobes. Different amounts of low-frequency attenuation are obtained by a reactor shunting the output. These micro­phones are intended primarily for indoor use and if used outdoors may require some additional protection against the wind.

Regular Price: $0.00
 Guaranteed Best Price: $2,500.00 


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