Best sounding 6SN7 VT231 for amplifier input

After trying out various WWII era Sylvania, RCA, and clear glass Ken-Rad VT-231s, I finally plugged in a newly acquired matched pair of black glass Ken-Rads and they have literally transformed my system.

They don't have the same top end extension as the Sylvanias, but I feel they have a more "correct" and liquid treble, lush mids, and solid bass. Bigger soundstage too.

My preference was the 6SN7W metal base, followed by the Ken-Rad and Tung-Sol black glass. The Mullard CV had a little higher noise floor, but very seductive and enveloping. When I wanted to simply float away on the music, the Mullard was a great choice; but just a little too romantic for serious listening. Enjoy.

The final choice of course comes down to your system and your personal taste. This list should keep you busy for a while! :-)

Sugarbrie, I think I got a set of Raytheons and Mullards around here somewhere...need to try them out too.

Thanks everyone!!! Your feedback was greatly appreciated and useful. Anyone heard of mixing different tubes together? It was suggested that perhaps combining RCA vt231 with Mullards and Kenrads would be good. I just do not have any experience doing this.
thanks again!!