I just received Ken's 45/2a3 amp. I am using it for my compression driver horns from 800Hz up. I was using a 'quite famous' UK brand 300b amp. On replacing the 300b with the 45 Otomon amp, the improvements were immediate (after 30 mins warm up) and evident. Voices and instruments took on a clearer outline and there was more separation. Not only that, the rhythm and timing improved and instruments stopped on a dime (if they were meant to); bongos had more of a tone (havent tried other instrumentals) and also backgrounds seem darker. I am enjoying the music so much. Overall its a great amp for the money - - and all this including using very affordable tubes (used) that I purchased from ebay - Ken, thank you !