Which Integrated tube amp?

you could buy an Audio Note Meishu for about 3K (without phono) and experience 300B magic with 8 extremely robust watts per channel

I just recently purchased the Rogue Cronus with magnum upgrade (total cost $2200)- it is a very well built and wonderfully musical sounding amp - hadn't heard it before ordering, and for me glad that I got it. The upgraded amp comes with NOS 12au7 & 12ax7s and EH KT90s , though you can still use EL34s. Upgrade pushes max wpc from 55 to 90. I am using it with Tyler Acoustic Linbrook System 2s

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I wouldn't look for a random amp and then try to pair speakers to it. This seems like a huge waste of energy. I could understand this approach if you listened to five 300B amps with different speakers and the 300b sound was "The One."

I suggest listening to ten different speaker brands and narrowing it down from there. Pair the top three speakers you like with different amps and select something from there. You will like something about a certain speaker like the tonal quality, dynamics, speed, spacial qualities, etc. You may hear lines that you can't afford but at least you will understand what speakers can do. This will matter the most IMO.

Again, I could see going in this direction if you were getting a SUPER deal on something like an ARC LS26 and ref 210 amp and wanted to build a system because you just couldn't turn down the deal/quality. Otherwise I would consider the speakers more important than an ordinary $2500 integrated amp.

Good luck.

Save up a little more money and try out a Grant Fidelity Rita 880 Reference....