I need to conect to the braid of RG-59B/U with some kind of clamp over the cable's braid. The interface is to a circuit board. Soldering the braid is not viable because the inner dielectric could melt and this cable is supporting 3 kV. Can anyone offer a suggested clamp, manufacturer and/or part number?

Thank you.

These were from channel master 30 years ago i still have a few left. I have the tool for them too, but in a pinch, a person could pinch them with a set of needle nose pliers

I have seen them used many years ago for the HV lead that went to the old CRT TV picture tubes too

Radio Shack used to sell those crimp rings. Maybe they still do. Even if they don't I bet you could find a RadioShack that still has some in stock...

MCM Electronics carries all kinds of that stuff. Check out their web site at www.MCMInone.com

It's too bad the OP didn't post a picture of the interface connection in question. It's kind of like a shot in the dark as to guessing at what may or may not work for him.
At 3kV though, it almost sounds like he needs some type of modified spark plug connector.