Just a suggestion: try a NOS Mullard 5AR4/GZ34 from the Blackburn plant, in the rectifier slot first, and listen for improvements. Then find a NOS TungSol 6SL7GT/VT229 Round Plate(from the 40's). There are a lot of good NOS 6V6 power tubes that will each give you a different flavor in your presentation. ie: If you want a bit more warmth; you might try a pair of Brimars. For a cleaner, more detailed sound; Sylvania or Ken-Rad. RCAs will be somewhere in between. Have fun, and enjoy your music.
