ARC LS 25 MK II vs. BAT VK30SE

I have replaced, recently, the stock 6922s in my LS25 with the 6H23s from Upscale. The improvement in the performance of the preamp is unbeleivable. Improvements include: dynamics, bass authority and focus, increased robustness and sweetness in the midrange, more extended highs and greater overall coherence and musicality. I have heard all the above preamps including the LS25 MKII, and I would not trade my LS25 with the new tubes for any of them.

I'm using a ref 1 now. Has anyone had good experiences with nos tube swaps with these ? Recommendations ? (please try to keep the tube cost under $25 ea). The ref 1 take eight of them! How much are the 6H23s from Upscale ?

I have a Ref One and am using the 6H23s from Upscale with very good results. The were $25 per tube. The results are just as described earlier in this thread.

I SUGGEST THAT YOU CHECK OUT THE NEW SOVTEK 6922 PI. IT IS VASTLY SUPERIOR TO THE 6H23 TUBE. THIS 6H23 TUBE THAT HAS BEEN MENTIONED REPEATABLY, HAS BEEN AROUND ALONG TIME. IT WAS ORIGINALLY IMPORTED BY SVETLANA. IT IS A GOOD TUBE,BUT
THE NEW 6922 PI IS MUCH BETTER. IT IS BLACK PLATED AND BORROWS ALLOT FROM THE 6H30 TUBE.

where can you find the 6922 Pi? Isn't Svetlana having trouble with importers lately?