I've never tried a Sophia or Psvane 6SN7. Seems like a lot of money to find out how they sound. I still love my 1960s Westinghouse 6SN7GTB tall, black plate, copper rods. Have 4 of them. Set for life & beyond. Liked these better than any other NOS or new production I've tried, including Sylvania chrome domes, RCA red-base 5692, Tung-sol and a host of others.
My speakers best attribute is their huge, open soundstage and the Westinghouse were clearly the best in that arena.
I was lucky to even have tested them. I rounded up about 20 6SN7s from various sources and one just happened to be in the lot. I had not sought it out. Was comparing all of them over the course of a few weeks and when I popped it in and let it warm up, I played one of my demo cuts and immediately was wowed by it. As it was a used tube, there was no need for breaking it in.
I haven't used any other 6SN7 over the past 18 months.
