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There’s a neat little history lesson unfolding on the AES SC-04-04 mailing list: Ray Rayburn is compiling a history of microphones and asked for some assistance regarding the Western Electric 640-AA condenser microphone. This prompted responses from industry notables including Leo Beranek, and Mead Killion ( of Etymotic Research) among others. Ray posted a couple of the documents he received from Leo and from other sources at his site and they provide some fascinating insight into the development and calibrationof early condenser microphones.
Check it out if you have a moment.