I'd watch that whatever the pins set on is
conductive. I think you can
get some static effects if you don't have conductive materials in the
thing. I had one that was made in a black plastic bread box, and it had
conductive foam to park the parts in.
Mine is a professional unit (although Brazil-made in 1980's) and hasn't
anything conductive, only a layer of thick black paper on botton. But here
we have not so many static electricity problems :oP