I have not had great luck with reliability with some of the Shuguang rectifiers that came with my amps, but not terrible either. For me the issue with them has been more related to my sound preferences.
Chinese made power tubes (none fancy) I have had over the years on the other hand have been nice tubes for the most part, and I can't recall any failing prematurely. Maybe I was just lucky, but I have no complaints. Perhaps more importantly, for my tastes, at least the tubes I have gotten, were better sounding tubes than most of the Russian tubes I have tried. I found those from China generally less solid and hard.... more delicate, nuanced and complex. I can imagine an overall Russian tube sound preference, but not in my setting and for my tastes.
Having preferred NOS 807s for many years, my current favorite all-round power tube in my Torii is a Shuguang (now with many, many hours and still quite nice to me)....open, balanced, and notably resolving of fine detail and space.... It sounds a lot like a powered up 807 in my setting.
https://www.thetubestore.com/preferred-series-6l6gc
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