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RCA Type 77-A microphone : ウィキペディア英語版 | RCA Type 77-A microphone 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. The 77-A would set the standard for all other RCA ribbon microphone comparisons for the next 40 years. ==Construction==
It featured a spiral acoustic labyrinth inside the case and two vertical in-line ribbons which enabled it to be uni-directional.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「RCA Type 77-A microphone」の詳細全文を読む
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