Hi 0461,
Fantastic speakers, which i have been fortunate to own now for a few years. You will find my own post from a while ago on Powerful Tube Amp for SF Strads. You will see that I used to run the Strads with my old CJ MV60...great voices...but lacking in the power that the STrad is capable of using to deliver powerful bass. (Yes, the strad sounds wonderful with mid-powered tube amplification...it is just that having ample power reserves for the bass drivers does make a difference in the Strads delivery of bass..which can be very, very good)
in the end, i own a Gryphon Antileon (second hand). Gryphon has a reputation for being a warm, sometimes dark amplifier that has endless reserves of power. Endless. So the warm/darkness feels quiet tubey in some respects. But in terms of power, it is 100%, pure Class A at all levels...no Class A/B whatsoever. From 100watts per 8ohm load, it will double down to 3200 watts (peak) power per 0.5ohm load. (The Antileon Signature which is newer is 150watts class A...and also doubles all the way down... i believe one is on A'Gon now)
It made an enormous change to my bass (upper, mid and lower). It also dramatically opened the soundstage. And yet it bettered the midrange of my CJ MV60 which is a well respected mid-powered amp, particularly in the midrange and treble.
I have heard Krell evo 402 with Strads...liked and respected but did not love. OTOH, i thought Krell Evo 2 was stunning with the Cremonas...i think the Homage series need something a little different (to my ear).
I think you will find the Ref 3 to be quite a good match with the STrad...depends on the amp of course. In the case of Gryphon, Aldavis on A'Gon uses Ref 5 with his Gryphon and likes it. Plus I have heard the Ref 3 with Strads and ARC 110s on the Strad, and it was very good though i prefer Gryphons for tighter bass delivery. hope that helps. good luck! and keep us posted.