Some tube thoughts .. I've been listening to the KR rectifier for a few hours today and so far find it fatiguing and a bit harsh. I'm not sure how much "break in" time I should allow but if this doesn't improve a lot I'll put it up for sale. Perhaps the mesh EML is more my flavor, so far I like it much better than any others. @Prtuc2 if you ended up getting the KR I hope it suits your taste, clearly many like it. I wish Stratus/Stellaris tubes didn't require such a high spend to experiment but these amps wouldn't be as awesome with different tube types. I recently switched to a recommended input tube from earlier in this thread and really like it. Better tone and some added clarity. Be sure to read which ones require an adapter if you go that route. My favorite 2A3 tubes are Acme, will try Linlai at some point but my understanding is the differences are mild (both are very good for new production). @penguins I have a pair of the Shugaung Treasure 2A3, you can borrow them if you'd like. I think they're pretty good but find the Acme more detailed, clear, and spacious. I prefer new production when possible for the sake of cost and availability. I hope penguins's speculation about the WE 422a comes true, I'm not willing to pay the insane price people ask for vintage versions of those but want to hear what everyone is raving about.