Richard Knoppow wrote:

I am not surprized that no one makes crystal or ceramic
elements any more. For the most part microphones to fill
similar applications now are electrets.

Actually, there are a few companies making ceramic elements for military
applications. They can stand abuse that would kill even the Gentex military
electrets.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."