[Elecraft] D-104, only slightly OT

[NG3V]

Good morning,
 
I have an old D-104 that worked fine when last used (1977) and want to use
it with the K2.
 
I know I could replace the element with one from Heil, but I would prefer to
keep it as original as possible (it does have the preamp in the G stand
base).
 
I will assume the preamp works, and I know the K2 works, but I'm not so sure
about the original element in the mic.  
 
Does anyone know a way to test the element before wiring it up?
 
Thanks es 73,
 
Tom, NG3V