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AKG genuine CK12 Brass capsule: building DIY mic with a single Jfet-transistor

I have got discovered vintage AKG CK12 Brass capsule at home.

I would like to build a mic with this capsule and use a standard one-transistor Jfet circuit of ECM electret mics (common source either
source follower)...

Has anyone ever tried to wire such a large capsule with a single Jfet transistor ? Do you think this might work as a decent condenser mic ?

Front and Rear of Control Room

In 1978, when I was a grad student at North Texas, we were installing a new master control room for the College of Music. Back then, the discussion had to do with contrasting front and rear wall treatments. Our room was designed with a live front, monitors mounted on a wooden wall, with the rear wall deadened by at least three feet of soft insulation.

RF preventing me from using my home studio

Just moved to a new apartament, set up my old gear in a new room and turns out that now I'm receiving an unbearable amount of Radio sign. I can even listen to what the Radio show is broadcasting.

To explain the situation better, I'm going to list some info

If I plug my microphone (condenser) ----> Focuriste, then I get lower/almost nothing radio noise