Suggests using 12ax7 and 12au7 tubes but with resistor changes others can be used. The filaments are NOT on the board (good), nor is the full wave bridge but does use long tail pair (alas, no ccs) and bias circuit for adjusting each output tube. No affiliation of course, but seemed like a fun "all-in-one" solution for those so inclined to build a 6l6, el34, even 6v6 amp. Both boards below are from the same seller but the one in German shows the schematic.
http://www.ebay.com/itm/190888847849?ss ... 1438.l2649
http://www.ebay.com/itm/1-Stuck-vergold ... 2ec9467bb9