The most common 5/6 pin socket for Stax phones are the black WPI and Amphenol jacks. They work, but the tin-plated contact material is less than "audiophile-grade" and it is very difficult to mount such jack into a thick wall wood case.
Below are the steps to put together a jack that can be mounted into a wood enclosure. It also have silver-plated Netrik contact pins (as an upgrade from the tin-plated stuff).
All components are available from Mouser, except the 5/6-pin WPI Amphenol sockets.
Edited by AudioCats - 5/26/10 at 5:46pm