Tube amps - what 3 things…

Well designed autobias is precise. The tubes idle @ the setpoint very shortly after turn on and after several hours of robust use. It's probably an order of magnitude more precise that a pot and resistor in fixed bias designs.

The biggest advantage with a quality CT OPT is both halves idle identically, thus reducing distortion and noise.

In general, power supplies are important on all pieces of equipment. I think point to point wiring helps determine quality of build and sound. I believe separates are critical for improved sound, so mono blocks would be part of my choice. Past these few generalizations you then need to figure in the room size and acoustics along with the efficiency of your speakers, then you could begin to narrow the choice down.

I’ve owned several ARC power amps Classic 120 monos were awesome except when they blew a tube.

My recommendation is the Ayon Spirit V I had the Spirit lll the Ayon amps are exceptionally well made. Auto bias, beautiful looking, top notch parts. Excellent protection circuitry. Not sure how much power you need. If you need more the Ayon Triton is a 120wpc in pentode and 70wpc in triode, it’s a beast!

I wanted to mention Ive been using a Aestheix Mimas for a couple of years now. It has a tube preamp with a solid state power amp. It’s an awesome integrated amp. Lots of features great metal remote, tons of power but it can sound really delicate if the music calls for it. Great reviews out there: 

Anything Jim White at Aesthetix make is finely engineered by a guy with ears. The Mimas is fantastic value…

IF a person believes point to point is inherently better than a well executed multi layer board in the right places…. might want to reconsider , ….

Best in music

Jim