I just recently upgrade my Supratek Chenin to Supratek Cortese mkII which is much more transparent hence differences between tubes can be easily heard. I tried Ken Rad black glass , big bass, nice presentation but not involving. Long time ago I have bought some NS grey glass 7sn7 - unbelievable what a change, tangibility, aliveness, transparency, huge dynamics, drive, drive. Different league.
After I have tried Sylvania metal base 6sn7W similar in scene, transparency but I have lost tangibility and drive.
Somebody told me that CV2821 is special, I was lucky to be able to find a pair. It do not have drive of NU grey glass I was not tapping my feet, but it have speed, transparency, resolution I never thought is possible with my gear.
If only I could have dynamics, slam of NU grey glass with speed , transparency of CV 2821.
After I have tried Sylvania metal base 6sn7W similar in scene, transparency but I have lost tangibility and drive.
Somebody told me that CV2821 is special, I was lucky to be able to find a pair. It do not have drive of NU grey glass I was not tapping my feet, but it have speed, transparency, resolution I never thought is possible with my gear.
If only I could have dynamics, slam of NU grey glass with speed , transparency of CV 2821.