Interesting tube. I tried to find info on them. What I read is they are from a unknown plant in china. Then matched and graded.
I got the Shuguang Golden Treasure 50th aniversary. I like them. Chines tubes arn't all bad. I still want to try the ACME KT88. But I may try a KT120 first.
Perhaps I can be more descriptive (and comparative) on some future post, but for now I'm just going to enjoy the break-in ride and let them settle-in a bit.