Five hours left!
http://cgi.ebay.com/LARGE-15-INCH-RCA-RADIOTRON-ELECTRON-TUBE_W0QQitemZ290166731181QQihZ019QQcategoryZ3638Q QssPageNameZWDVWQQrdZ1QQcmdZViewItem

Probably from an early industrial video camera,, replaced by the neuvicon tube which was warmer, and showed less streaking and burn,,to the best of my knowledge

*sigh* i wante dit

Thats a "IO" IMAGE ORTHICON tube from a early BW camera it's operation is a bit different from a vidicon.