http://www.radiomuseum.org/tubes/tube_33jv6.html There's a pinout and that's it.
I went through Frank's Tube Datasheet website, the Tube Datasheet Locator, and The GE tube book. No 5, 6, 8, 12, 33, or 50JV6.
No one seem to want to fess up to this turkey. :p