FWIW, Stereophile reviewed those speakers a couple of years ago using three different amps. The reviewer like the Line Magnetic LM-518 IA.
https://www.stereophile.com/content/falcon-gold-badge-ls35a-loudspeaker-page-2
Amp for LS 3/5a Falcon Gold Badge
I just purchased a pair of Falcon Gold Badge LS 3/5a's which I will receive in about a week. My question is what amp to use the the LS35A 's? I currently have a Boulder 866 which is proably a huge overkill with its power. Tube or SS? Watts needed to properly power these speakers? I was thinking a Enleum 23R or Pass Int 25 should work but I am not sure. Any feedback on what amps have worked outstanding with your LS 3/5a's would be aporeciated. I would like to keep it simple and stay with a nice integrated.