Having heard the A3s at a local dealer they definitely have a sound signature that can be made or broken by amplification according to my sonic preferences.
So the choices become important.
I would suggest a nicely clear and smooth, slightly forward tube preamp that uses 6SN7 tubes- example Cary Audio SLP-05, ModWright LS100. Combine that with a dead neutral power amp e.g. Bryston 4B3, McIntosh MC312 and you'll have a winner.

