RCA Type 77-A
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. 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.
Also recorded as RCA 77-A
RCA Type 77-A
- Field
- ribbon microphone
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Documentary summary
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. 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.
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wikidata · Q7276064
In this article
Construction
The 77-A would set the standard for all other RCA ribbon microphone comparisons for the next 40 years.
It featured a spiral acoustic labyrinth inside the case and two vertical in-line ribbons which enabled it to be uni-directional.
Primary material
Context
The circumstances in which RCA Type 77-A stands. Recorded as a kind of ribbon microphone. Manufactured by RCA Corporation.
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The Encyclopedia exists whether or not anything is for sale. Corrections are recorded rather than overwritten, and every version of this record is kept. Published 16 August 2026.
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