PVC KK50 capsule for M 50; how rare?
Author: matthew mcglynn
Date: 11/05/2009
This is primarily a question for Martin Schneider, although I welcome input from everyone.

Martin's AES paper, "Omnis and Spheres - Revisited," states that the Neumann M 50 microphone originally was equipped with a KK50 capsule, and further that the KK50 had a PVC membrane.

Do any photos of this capsule exist? Do any production numbers exist -- meaning, how many KK50 M50's were sold?

Was the KK50 used in any other microphones, or was it developed for the M 50?

I'm trying to get a sense of how rare this original KK50/M50 was. I've talked to a couple people who have worked on vintage Neumanns, but they've never spotted a PVC-capsule M50 in the wild.

Is it possible that the PVC-capsule spherical omni was only ever used in the CMV3 bottle attachment, but not in the M 50?

Vielen Dank!  
matthew mcglynn
Martin Schneider/Neumann