Are some instruments un-shieldable/groundable

[alex1fly]

Well, no luck in my attempts. I shortened some wires, redid a few solder points. Every point is 100% when I check them with the meter. There is some shielding in the cavity but it's not a lot. The buzz doesn't even change or go away when I take off the control plate. Bridge ground is solid, verified with a meter and even using a wire with alligator clips; one end on the bridge, the other at a ground point (like the jack or volume pot). Zero change. So, I'm going to leave it as-is for now until I can shield the cavity better and maybe even get a couple replacement 250K pots. I've run across this in a guitar before and a pot was not quite right so it would buzz no matter what. It's not a lot, but it's noticeable. This is the only bass or guitar I have with a metal control plate.

Bummer. Sounds like my life with guitar electronics. Sometimes it works, sometimes it doesn't.

 

[Chistopher]

You can't shield a theremin. It wouldn't work.