As a semi normal consumer (paranormal?) I can’t carefully listen to boatloads of amps but the two amps I rotate in my gear heap are a 12 or so watt per side Dennis Had tube "SEP," and a Pass XA-25 that actually sound somewhat similar. The Pass amp may not be powerful enough for your tastes but they make plenty of Class A amps that are. Try Uncle Ralph’s (Atmasphere) Class D amps and see if you agree with his utterly unbiased opinion.