surprised it will work well with Kabers. Only 15 watts in class A and that is probably optimistic. I suppose if you don't need to crank it will manage.

You want a speaker that is sensitive and a fairly easy load to get the best out of it. 'Kabuki' speakers should be a good match. Or Wharfedale E series. Or if you want to get spendy some classic JBL - Century L100 would be my pick, about the right era too.