Posted by Scott Dorsey on 03/26/06 02:40

Richard Crowley <rcrowley@xpr7t.net> wrote:
>"Jay Rose" wrote ...
>> IIRC, RCA had a professional directional mic back in the
>> 50s that used multiple exposed tubes.
>
>Was that the same era as the ElectroVoice 643 which
>was the size/shape of a shoulder-mount bazooka or anti-
>tank launcher? I wonder if RCA's design was an attempt
>to circumvent patents, etc?

I think the RCA actually predated the 643. And the 643 stayed in the
catalogue for years and years... I know EV was still selling it in the
early eighties.

RCA had a patent on the multiple tube thing, as I recall. It turns out
it's actually not a good idea because there are more narrowband resonance
issues than with a single slotted interference tube. But nobody knew it
at the time.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

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