Hi 0461.
I owned STrads for a number of years, but i have not heard them with Jadis...however, i have heard the Strads with a number of different tube amps (2 CJs, ARC Ref, Pathos, Unico) and have not been disappointed once. Based on my experience, I would definitely be prepared to bet it is a remarkably good sound in the areas where the Strad is strong - voices, spaces, life, musicality. I do not know the Jadis and their ability to control bass...despite the bass on Strad being very good, it responds extremely well to high current to control its drivers.
Good luck and please report if you hear them. even though i no longer own the Strads, i would be curious to know about how well they pair with Jadis.