There isn't much info about the Tung Sol KT-150 if any at all. I tried contacting to New Sensor directly about the Tung Sol KT-150 and they were mum about it.I never even got a response from them either.
The reason the Chinese haven't copied the Russians might have something to do with their raw materials and their technology. They are behind the Russians on both.Just saw this. A little more in price than the Tung Sol
http://www.leisure-audio.com/Shuguang-KT120-tube%EF%BC%88replacing-KT88%29-p186.html