(Scott Dorsey) wrote in message ...
Jean Marie MATHIEU wrote:
This is very interesting

http://www.gefell-mics.com/capsules.htm

Who, except Gefell, make non mylar gold sputtering capsules ?

Nobody else. PVC has poor long-term stability, which is why Neumann gave
up on it years ago.

In 1960 or so, actually.

But, there are folks who still like the sound and can
live with the inconsistency and maintenance headaches.

Most U47s today have been reskinned with mylar, because the original PVC
failed. This changes the sound (and many folks love the sound of the
U47 with the brittle PVC diaphragm that is about to fail, too).

What is the technologie of the Schoeps, Neumann, Josephson etc. and why ?

Almost everyone today is using mylar diaphragms with some sort of metal
sputtering. Mylar is light, consistent, and stable.

Just for the record: Mylar is a brand name for a type of polyester.

Gefell, and some of the measurement microphone people, make a few capsules
using very thin nickel foils, with no plastic backing. Schoeps also did
this in the 1950s but no longer does. The original technique for this dates
back to the Western Electric 640AA.

Neumann makes the K33 capsule, used in the TLM 50 and M 150
microphones. The original version had a nickel membrane, and now they
are using titanium.

Some (or perhaps all) of the capsules made by Sanken use titanium
membranes.

A small American manufacturer whose name I won't mention is using aluminum
capacitor foil for a diaphragm. This has a very high mass and results in
poor high frequency response.

These are the only exceptions I know of.
--scott

Hmm... I can only guess to whom you are refering...

Karl Winkler
Lectrosonics, inc.
http://www.lectrosonics.com