The A3 has a dual mono configuration, with a separate power transformer for each power amp, and separate windings for the preamp and remote control.
When Fremer reviewed the Outlaw RR2150 for Stereophile, he tried a number of different speakers and they all faired pretty well. I think that your Concertinos would go with either amp. I just find the MF a notch or so better overall. If this were for my main system, I would go with the MF. For a second system, the Outlaw would be fine.
Regards,
Rich