Power amp for Reference 3A speakers?

Not knowing your budget, I agree with Saki70's recommendation. By all accounts it is a fine amp and they tend to be easy to re-sell if you don't love it.

I drove my De Capos with Quicksilver Mini Mite Monos for several years. Sounded great. The Mini Mites can typically be found used for around $650/pr.

I hear jazz, classic and rock. My budget between 2000 and 3000 dollars. Thanks for your answears.

First find foam/felt surrounds for the tweeters as they tend to splash. Next bi-wire. Clear Day Solid Core Speaker Cable- silver shotgun. Finally get rigid stands and Herbies BFDs to couple

Check out Wyred4Sound smallest stereo amp, or a PS Audio amp modified by Cullen Circuits

There is a Pass labs Aleph 5 on the GON right now for 1400.00 and a Pass labs Aleph 3 for 1000.00 I would suggest either one with your De Cappo's
Also Antique Sound Labs 845 tube amp.