Most of my 6sn7's and VT231's are from the 40's and 50's. National Union, Ken Rad, Sylvania, RCA, Raytheon, Tung Sol and no doubt others. Lots of nice vintage tubes, a few newer ones from Amperex and Electro Harmonix but mostly favor the ones from the 40's and 50's.
I also have a group of 7n7's which I haven't even tried yet. I think they are 40's and 50's, all are metal base tubes.
For 12AX and !2AU7, I mostly prefer tubes from the 50's, Sylvania GB Gold Pin 5751's and also Amperex Bugle Boys. 50's and 60's I guess?