[Elecraft] Preamp and Heil mic

Sorry I was not specific. I thought that all Heil mics with X element would be the same. I am considering the Classic, which comes with a pro element and your choice of the HC-4, HC-5 and the IC element for ICOM. I am not too interested in the HC-4, as I understand that is for contesting,

[Elecraft] Microphone preamp and Heils

Hi, sorry if this repeats previous information request, but I did a lot of searching and didn't find anything directly on point (even though there were several threads on preamps and Heils, etc.) I downloaded the Microphone Pre-Amp for Heil schematic on the Elecraft website. My questi