Powerful Tube Amp for SF Strads?

CAT JL2 or 3 for sure, I think they can handle most any load and with 100 watts of Class A, Triode power they avoid what Raquel alludes to regarding high-power tube amps, they tend not to sound as good as their lower-power bretheren (assuming the lower power remains sufficient power to drive the speakers).

I must say that is quite a challange. A tube amp with moderately resistive speakers but not near the tubes output impedance, instead it drops precipitously and creating a worsened output mismatch and less power.
Hmmm.
There is an easy fix. Simply buy the tube amp with a monster power supply and if possible an output coupler. In common terms this means get a tube amp with the biggest transformers you can and ignore total or rms wpc. Those watts mean nothing. My 60 wpc Jadis DA-60 just doesn't clip although I haven't tried to make it explode it handles everything I want it to. Also The Kilovolt power trannie 211 or 845 PP amps provide plenty of foundation. Honestly That is where the music is -in the trannies once the major obstacles are met then subtleties can come in and do their thing.
Thus I congratulate you on the wisdom of thinking Wavac and LLam. Those are perfectly good examples of "transformers make the music."

Forum mate Downunder is using McIntosh MC2102's monoblocked with the SF Strads, check with him.

I have heard the Mac 275's in mono with the SF Elipsa's and it was truly beautiful. With the Strads, I would think the Mac 2301's a better choice.

The Art Audio quartet monoblock are hook up with the
Andra I Eggleston,the power is more than enough,and they
excel in palpability, and musicality,they have good bass
too.You can email Joe Fratus from Art audio.You can also
email Markr1,who own the system,Ive heard.