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The Desk Microphone HDP-21A came on the market in 1968.
It was really an Electro-Voice
638. It was the successor of the HDP-21
(Electro-Voice 605)
that came
on the market in 1962. The HPD-21A
was then replaced in 1976 by HDP-121
(Electro-Voice
619) and by the HDP-121A
(Electro-Voice 620)
in 1978. It is a Hi-Z dynamic microphone with crystal clear audio.
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