New Sensor (Tung-Sol) came out with the KT120 around 15 years ago now. It’s a great product - I’ve uses dozens of sets by now, and still never a single problem.
Shortly thereafter, Psvane made their own KT120 copy. It didn’t go well, and was pulled from market. I remember lots of online discussion over these tubes either going bad quickly, or just causing problems from the start. And it seems every time they tried again - you get the same stories. Nobody ever rode off into the sunset with those tubes. And now they’ve copied KT150 - you couldn’t pay me enough money to stick those in one of my amps.
As far as I’m concerned Chinese tubes stop at KT88 (here at least - they’ve made some good ones, although the original Shuguang factory seems to be deceased). Why risk anything else?