@lowrider57 I have. Now using Psvane 12aU7 and 12aT7 MkIIs made in 2020/2021. They are installed now in two mono tube amplifiers.
Bought them to set my vintage nos Mullard Blackburns aside in storage. After the psvanes settled in a bit I kept telling myself I’d let them play a while longer. One time in the last year i reinstalled my other best curve-tracer matched triode Mullards back in play. That lasted a week, and i went back to the Psvane MkIIIs. I was looking for something smooth, not lean, and they fit the bill for the sound I wanted.
Prior, i had tried some older premium box pairs a colleague sent me, dated way back to 2013 I think it was, and they did not sound good to me On a whim, i re-tried the latest 2021+ version I have now. Sounded nice. Not bright, smooth, not overly detailed. Had tried vintage EI Yugo, RCA, GE, Tungsram, and newer JJ, new re-issue Mullard (not real Mullards) along with various original vintage mid to late 60s, and early 70s Mullards. Still have all of those. The 12axx psvanes have stayed put. Hoping they last beyond 2+ years. We’ll see, time will tell. Your experience may vary.