Amp-preamp, Integrated paring with Magico A3

I agree @bubba12 .  I was just going by his plan to use tube pre with ss amps.  I think that combo is a great way to tame harshness if you have it.  But I agree with @zlone on using Audionet Pre G2 with Audinet Max amps.  NO harshness there with the Magicos!  They need to be 'lit up' in my opinion and the Audionet combo would make them sparkle.  I know I tried a current model McIntosh Pre with my system and I found it dull and veiled.  Maybe the AR is not like that, I do not know.

I’ve had the A3’s for a number of years now. The best amp combination I’ve used is the NAT Audio Symmetrical Balanced Line Stage pre and NAT Audio Magma M monoblocks. 

Initially I had a Yamaha A-S3000 integrated, then put in a Dynaco PAS-3X pre, then replaced the A-S3000 with a Prima Luna EVO400 power amp. Then I put in the Symmetrical and NAT Audio 802 Generator monoblocks. Now the Generators are replaced by the Magma M monos. 

The tubes of the NAT gear really goes well with the A3’s, The Magma M’s have been a tremendous upgrade from the Generators. I’m done with power. Although those Magico S3’s look really great! To be continued...

No, GaNFET's aren't any better than well implemented Hypex NCoreX or Purifi Eigentakt amps at half the price. Get your Constellation amp. It'll leave room to upgrade speakers down the road. 

You mentioned T+A and an affinity for tubes. I own a PA 3100 HV paired with Harbeth 40.3XDs which on paper are slightly less efficient the the A3s.

I was drawn to the amp after owning 3 different tube integrateds because of the high-voltage design that claimed to be more tube-like, and I love it. 
 

It fills a really large space with amazing sound effortlessly. It rarely comes out of class A as the meters rarely exceed 10 watts playing loud and crystal clear 40 feet from the speakers. In the sweet spot 10ft away the sound stage and imaging is great. 
 

it is warm but detailed and far from clinical. 
 

They are not cheap but will power almost anything you may own in the future.

They occasionally appear on the used market (unsure what your budget is).

I also owned a BAT hybrid integrated that was good but nowhere close to the T+A, but to be fair it was less than half the cost new.

I get my tube fix from a tube DAC and tube phono.

FWIW…

Good luck in your search.

@glennewdick 

I heard the A3 driven by an Aavik (Group Denmark) Class D integrated amplifier.  The sound was powerful but soul-less and the system did not sell me on the speakers.  Amp synergy is going to be extremely important with your speakers to make them as enjoyable as possible.  

Since they need a soul along with above average power hence the suggestion for a lush tube preamp with 6SN7 tubes (tube rectifier can also help) as well as a clean Class A or AB power amp.  

If you want to stay Class D the best most soulful sounding amps I have heard are from AGD , specifically the Audion.  Really nice sound that should complement the A3s.  Good Luck !