I have no idea what this is:
http://home.comcast.net/~bobengelhardt/tube.jpg
but it looks like it would handle a couple of kw. Writing on it:
"Amperex
4 PR 125A"
and
"164A
5L804
9612"

There are 5 pins on the bottom and the top looks like a connection.
Looks like it was never used. I picked it up at the dump 'cause it
looked cool. :-)

You can have it for the postage.

Bob