To me, they are much better than US and Russian made 6AS7 tubes, more refined without being "tuned-down" or lose any PRTA , I just love those round cup base 6AS7G.
Mahler Symphony No. 2 not because of the performance but the engineering of the CD was so bad. It was on 2 disks and the first disk was just 20 minutes long and the second disk was chopped up into so many parts even a track break in a middle of a song. Just horrible! It was just a cheap used CD so I did not lose out much. I thought about having a 300B based amp but recent health issues is taking up the funds. The key thing I can say is just to have fun and enjoy the company and happy in spite of the limitation that life sometimes throws in your path. I think that the many posts here and the talk about food are showing off the fun we are having.
I heard Mahler Symphony No. 2 at a guy's house I was selling my KT88 mono to. He used a Denon CDP -> Pass Lab 250 -> Martin Logan a model similar to Theos. They sound terrible together but the guy loves it, so I took the money from him and ran, I did not want to stay in his house for any extra second. The second time I talked to him and found out he has hearing lost at HF...... so that godness of treble energies did not bother him.
I agree there are personal perspective about music and gears, but there is also a common ground for what is good sound. Glenn's amp sound good compare to ...... regardless they suit one's taste or not.