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.
