Sometimes the membrane will get damp and it affects the mic's performance. Try warming your oven up to about 125 degrees fahrenheit, not hot enough to distort any parts or soften the soldering. Turn the oven off as soon as it gets there, then put the mic in, close the oven door, and leave it in until the oven cools. That might do the trick.

I've heard of changing capsules and I've changed a cartidge myself, but I would imagine it would take a skilled technician to change the membrane...if it is even possible to do after the initial construction of the capsule.

Good luck on it.

Miie

You've got to know your limitations. I don't know what your limitations are. I found out what mine were when I was twelve. I found out that there weren't too many limitations, if I did it my way. -Johnny Cash

It's only music.
-niteshift

Mike Dunbar Music