[Phlogiston]

I don't know about Russia (we have Russian friends here), but, I am sure that some of the transistors sold out of China are not only counterfeits, but very inadequate ones at that. There is a lot on the web about this. I have experienced it myself. Very much worse than Chinese tubes or caps.

If a output transistor is obsolete, but you find someone in China that just happens to have some. Find a good substitute and get it from Mouser.