Klipsch Cornwall IV and Luxman Integrated

I've owned the CW IV, for solid state the Naim Uniti Nova was an excellent match. The Uniti Nova provides a ton of value as an integrated amp, DAC, and streamer.If budget is an issue you'll save on components and cabling. 

For tubes, I really liked the Audio Note Cobra and Triode Lab 2A3. The AN Cobra also had a capable built in DAC.

Solid state had the advantage for tight bass, tubes win in the midrange. Voices with the 2A3 were scary real.

you’re using 275’s in mono? talk about way over kill. you don’t need the power of one 275 let alone two in mono. I ran LaScalas, similar enough efficiency to the Cornwall, with 2.5 wpc with out issues.

In my experience the new Cornwall’s sound fabulous on a 300b SET amp. But I have also heard them on a Class A SS amp 25wpc and they also sounded great. the SS amp gave them better bass control and top end extension but wasn’t quite as nice in the midrange but that’s what 300b’s do best.

I wound imagine the Luxman Class A amps would sound very good indeed. but stick to the lower powered class A amps you do not need the power and really lower watt amps sound better on hi efficiency speakers mostly due to lower amount of devices in the circuit. Hi powered amps just don’t’ seem to sound as good as lower powered amps with hi efficient speakers,

I second the 2A3 suggestion i also ran triode Labs 2A3's with mine. fantastic combo. 

I think it's a good match, but I also really like the Rogue integrated tubes.

Class A & tubes

I have it on two highly qualified accounts that the Jadis DA88S Integrated is an unbelievably solid pairing with the Cornwall IV.

Luxman SQ-150n tube amp