I think it’s a bit early for me to give the wide range evals that you are looking for but will try to shed some light as far as possible. Bear in mind that I’m just a listener, not a golden eared evaluator.
So far I’ve tried Sylvania 1952 Bad Boys-nice even response, musical but maybe could have better bass. Then the Psvane C181T 11, very nice smooth with good bass. Newly acquired Ken Rad 6SN7, a nice surprise here, very clear vocals, great bass, good horns. Two nights listening. Going to go back and forth for a couple of months and settle on my go to.
Have also some GE 6SN7s and Sylvania chrome domes, as yet untested. Given a few months I could probably do better. Heck my Gen 3 is just now passing the 40 hour mark but it certainly is a great improvement on previous pre.
Most definitive impression is the Ken Rad bass. My speakers have built in active subs, plus I have a pair of REL 212s so when bass it there I know it for sure. Side two, DSOTM at the end I heard bass I had no idea existed.
And when I mentioned output tubes to Mick I think he brought up the Psvane tubes. Not necessarily a definitive recommendation but alluded to them being good.
