The old VT-231 types (any brand) would be my first choice. The Ken-Rad have the best bass. You will find VT-231 made by RCA, Tung-Sol, Ken-Rad, Raytheon, National Union, and Sylvania.
Ed....I get the feeling you think the VT-231 are no better than the others because you have none for sale?
Actually the various 6SN7 types are not all the same. While they will all work in all 6SN7 sockets; they do not all have the same voltage and plate disapation ratings.
Consequently some will run hotter than others, and therefore, will not last as long as others, and will not sound the same. The various 6SN7 types and voltages are:
5692 - 275 Volts maximum & maximum 1.75 Watts per section
6SN7GT/WGT (and VT231) -- 300 Volts maximum & maximum 3.5 Watts per section
6SN7GTA/GTB - 450 Volts maximum & maximum 5.0 Watts per section
Some types may not be appropriate for some gear. You may want to check with your gear's manufacturer if you are not sure. The GTA/GTB were originally made to a higher voltage primarily for use in televisions I believe.
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