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An RCA 77-D used by Dick Clark Larry King with Vladimir Putin in 2000. The RCA Type 77-DX microphone is a poly-directional ribbon microphone, or pressure-gradient microphone, introduced by the RCA Corporation in 1954. It was preceded by the Type 77-D introduced in 1948. [1]
The RCA Type 77-A microphone was a simplex (uni-directional) ribbon microphone, the forerunner of the RCA Type 77-DX microphone. The 77-A was designed Dr. Harry F. Olson in the late 1920s or early 1930s; prototypes are rumored to have existed in 1929 and 1930, but the 77-A was not announced until 1932. [1] The 77-A would set the standard for ...
RCA's strong patent position meant that the company effectively set the selling prices for ... Tower" in the old RCA Victor Building 17 [77] ... Microphone. Victor ...
The following year, RCA introduced the Type 44A Velocity Microphone. Its tone and pattern control helped reduce reverberation. Many RCA ribbon models are still in use and valued by audio engineers. [13] The BBC-Marconi Type A was an iconic ribbon microphone produced by the BBC and Marconi between 1934 and 1959. [14]
Other directional patterns are produced by enclosing one side of the ribbon in an acoustic trap or baffle, allowing sound to reach only one side. The classic RCA Type 77-DX microphone has several externally adjustable positions of the internal baffle, allowing the selection of several response patterns ranging from figure-eight to unidirectional.
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