Modwright used to do a tube-mod of the Oppo Disc Players. Sometimes you can find them used.There were 2 tubes sticking up on the top of the player and a new separate power supply box. I had one but sold it .
http://modwright.com/modifications/oppo-bdp83-and-bdp83se-mod.php
http://modwright.com/modifications/oppo-bdp83-and-bdp83se-mod.php