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The 77-DX is a high-fidelity ribbon (or "velocity") type mic that was originally designed for both television and broadcast studio use. Two different finishes were offered: umber grey for TV (since it was non-reflective), and a satin chrome version for radio broadcast.
The 77-DX was advertised as a ‘polydirectional’ mic; what we would call today a multi-pattern microphone. The various polar patterns were created by using a tube connected to a chamber behind the ribbon. By rotating a shutter to close off portions of this chamber, patterns could be created from N for non-directional (chamber fully closed), U for unidirectional, to B for bi-directional aka figure-eight (chamber fully open). At a specific point on this continuum, a cardioid pattern is created.
The 77-DX has a frequency response from 30 Hz to 20 kHz. It is also possible to attenuate the low-frequencies with a screwdriver-operated switch on the bottom of the mic body, marked M (for music), V1, and V2 (for voice).
The RCA 77 series, which resembles a large pill of the capsule variety, has become THE iconic shape of a microphone, and remains so over 40 years after it was discontinued in 1967. The 77-DX was used in countless radio and TV studios in the 50s and 60s. Though rarely seen by the public, its excellent tone was certainly heard by millions, especially in the case of the most famous broadcaster of the period, Edward R. Murrow.
|Condition||Used / Vintage|
|Tube or Solid State||Solid State|
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