In my main system now I use Class D amplification. I do rotate between the different kinds of amps to just get different flavors of sound. Right now I have my Jolida JD502P with Tung Sol KT150 tubes powering my Ohm Walsh MicroTall SE. The Jolida does fine with powering them and is a nice space heater in these cold days. With the system/speakers I have I found Class D works best.