[Milsurplus] Carbon Mic Rejuvination

[mac]

Heard a rumor about rejuvenating old carbon microphones with AC  
published somewhere (ER maybe?).  Anybody know more?  My experience  
with the old military mics (T17 & the like) is that they either play  
or they don't, banging on the table , etc., never worked for me  
anyway.  Damn things can surprise you though, just picked up a pair  
labeled "Microphone T-17  4857-CHI-42.  Rattiest looking units I've  
ever seen and both work great!

Dennis D.  W7QHO
Glendale, CA