Linear Tube Audio is the only relatively cost effective line I have heard that comes to mind that is likely a safe bet to efficiently deliver the best "clarity" with most any speakers including Totem Arro, a speaker design that gets good bass out of a small box. That’s because of the patented and very unique LTA design that provides a more SS like low output impedance compared to most other tube amps with no output transformer involved, as I recall.
"Clarity" to me infers detail and dynamics along with a low noise floor.
Some Audio Research amps might be another different but reasonable alternative worth some consideration.
IF you are willing to change the speakers to match up better with most tube amps that are higher output impedance, meaning the speakers present a relatively easy load and are maybe also somewhat efficient, then there are many good choices out there from CJ to ARC to Atmasphere or many others. Otherwise the practical tube amp choices will be relatively larger and more expensive in that you have to beef up the amp to compensate for best results with smaller tough load full range speakers. Or you can offload the bass to powered sub and that opens up many more options regarding tube amps up to the task of properly driving many popular more full range speaker designs out there these days.
Fritz is a very good choice for an affordable alternative to Totem Arro that can be driven well with most any amp including most low power tube amps. I’ve heard Fritz speakers at shows run off flea powered tube amps and that is where I would look personally were I determined to efficiently build a tube system capable of delivering clarity in terms of detail and dynamics comparable to other more common approaches. That is something I have actually put a lot of thought into and might still try at some point but have not pulled the trigger to date. I have been more focused on eliminating tubes from my system and have accomplished that mission with very good results of late.
Spatial Audio speakers might be another option but those are larger and an open baffle design which is a totally different beast.
