I've had tube amps from Fisher, Scott, Dynaco, Dared, Bada, Yaqin and solid state amps by HK, Pioneer, Kenwood, Sherwood, Marantz and Classe but the best sounding so far are these 2a3 SET Bottlehead mono blocks. Wouldn't be a good choice for most folks on this forum as they make 3.5 wpc. But with the right speakers those few watts can be special.