while you weigh your Class-A options, get yourself a pair of these to hold you over... https://www.buckeyeamp.com/shop/amplifiers/purifi/1et7040sa/monoblock
I have their 3channel 400A Purifi and a pair of these 704 Purifi monoblocks.... price to performance ratio is hard to believe once you hear them (or "don’t hear them") I feed them from a BAT/Balanced Audio Technology preamp via XLR and the auto-turn-on feature is a bonus.