The Elecraft/Heil ProSet K2 uses the iC (Icom) electret mic element. It does not use either HC4, HC5 or new HC6. 73, ... Joe, W4TV On 7/28/2010 12:33 PM, Oliver "Olli" Dröse wrote: > Hi guys, > > can somebody tell me what Heil capsule is in the ProSet K2 that Elecraft sells? > HC-4 or HC-5? > > Thanks& vy 73, Olli - DH8BQA > >