I have a question concerning new production tubes. I quite using NOS a while back as it started to be a real gamble with some failures. I paid a lot of money for NOS Mullard rectifiers and some power tubes that I got only weeks to months out of. So far I've had fairly good luck although out of my last order I got a bad rectifier and a bad 6L6 from the tubestores preferred series. But with their great service that was easily "rectified". However it brought me to wondering, with all the years now that the China and Russian tube factories have been manufacturing tubes have they gotten much better at quality? I remember back in the 80's you bought a Hyundai car and it was a piece of crap. Nowadays I like my Sonata better than my Honda. So they improved. So has China and Russia gotten better at quality control? Surely they would be sick of the high rate of returns which would cost them money. Or is there some other factor that makes it impossible to produce a reliable tube for audio applications? Or is it better to to make a product that fails around the 2 year mark. Keep manufacturing humming along, etc? Just trying to understand if we could ever expect a high quality tube for our amps?