Steve, that is an excellent reference. I used a similar technique for driving a quad of 1625s in AB2, but used RC coupled audio amplifiers and a phase inverter instead of the driver transformer. The results are stellar! Thank you for your post!
Link to my project which shows a very similar technique with the 6SN7 cathode follower:
http://amfone.net/Amforum/index.php?topic=46696.0Feel free to move my thread to the Audio category if appropriate.
