Yep, Valve Art is definitely a Chinese company. When I received my Moondog amp's they had Chinese tubes in them; they didn't click or pop, but they made this weird sound I call tube farting, and that is exactly what it sounded like.My Electro-Harmonix tubes sound far better now than when I received them. For my tastes, I will use the Electro-Harmonix and Sovtek tubes, with a preference toward Electro-Harmonix. Your amp will tell you which brand will work best for your tastes. Let me know what you end up with.