I have been living with the GLs for 10 days now and have a good overall impression of their sound signature in my amp. The GLs and Shuguang SC have their strong suits but it's obvious that the GLs are better in musicality, sound-staging, imaging, separation, height, depth and super black backgrounds.
The midrange of this tube is beautiful and they're a couple of things I wished were better, transparency is a little on the warm side but it doesn't affect extension and they reach much farther than the SC without any brightness...
I've heard that the Psvane TII are more transparent, smoother and just more musical.
Wig