Ah yes they used a valve amp with KT88's
. The Jadis had KT88's and KT120's. For what its worth I found the Primaluna valve amp underwhelming on mine.
Your amp should be fine but personally
I think to get the best out of them like in all things in life you need a beefy amp. But that can come later. See if they have an expensive valve amp in the shop and try it hooked up to that. Also make sure you get the speakers spread out to ensure they are both at the same level.
Definitely as I mentioned earlier 57 panels can sound really nice even when the panels are well down on output so difficult to discern unless you hear a perfect pair.
Good luck with your quest.