@smodtactical I can't speak specifically to tubes you mentioned, but the Shuguang Black Treasure's running previously, and generally considered best of the low priced 300B weren't really in same ballpark as Acme.
I expected a modicum of improvement with Acme, not prepared for the massive improvement heard within five minutes of first listen to Acme, much greater resolving power most obvious change. Very disappointed I had delayed Acme purchase based on inability to choose which 300B to go with. I expect I'd be feeling exactly the same with purchase of any of the high end tubes.

