Aren't these tubes a very simple design? How complex are they really? That difficult to duplicate greateness of yore? Looking at the inside one of these babies it just doesn't look that complicated. But then again what do I know? Anyway, I'm beating this to death. BTW, Andy Bowman of Vintagetubeservices.com, you mentioned, would disagree about the 12AX7s. I'm not going to cancel my 4 NOS 12AX7s nor my 6DJ8s, but on down the road, you can bet I'm going to sample some Shuguangs and hear what's up. I will then have a referent. The 12AX7s I have in my amp are counterfeits. Andy says Amperex are counterfeited the most, but all the big names have their problems with fakes. Man does he know tubes. A wealth of info that overloaded my tube ignorant brain. He was highly recommended to me from some other audiphools. And most of all? HONEST. When he says it's a NOS. It's a NOS. As you can see from his website, he have the digs to know.