I have had 15 different tube amps . This amplifier is indescribable. It came with new Western Electrics. I put in NOS WE's from the 1950's it went to another level of solidness and reality. I put in late 1930's WE's engraved bases and it conjured Miles into my listening room. I played with different WE 310a's the mesh plates are the best, then the small hole, the the large hole. Older ones are just better sounding. I don't know why it just is. I have Ferguson Hill speakers, 114 db efficient , one driver from 160 Hz to 16 KHz. Anyone with a crossover in the higher ranges is missing the point source that I have. You are getting phase shift and smear that vary by frequency. The driver is effectively the size of the opening of the horn (about 5' high 3' wide). The dampening factor of that set up is 2 orders of magnitude better than tradition speakers. that means 100 times less overhang. The DX3 Lowther driver . The whole thing is spooky . This amp made them sing. Flawless. First row. Air and space around the rock solidly placed instruments. You hear nuances of voice and instruments that I've only heard live . it's not just a good sounding violin it's THAT VIOLIN.