I finally have my 6sn7/6v6 based prototype done! I chased down a couple of noise sources and now it plays sweet, sweet music. Now I just have to put in a more permanent container and add a couple more features.
the amp itself is based on the venerable 6sn7 driving a pair of 6v6's in single ended configuration, with power supplied by a Hammond 270HX transformer and rectified and filtered by a 5y3 rectifier tube and a hammond 159Q choke. The output transformers are Trancendar tt-012-ot 's