My ice-based mono-block amps are Audio Magic model 250's that are very tweaked and upgraded. My 300B SET is a John Hogan 6sn7/76/300B with all Webster OPT iron.
My JH 300B SET - strenghts are a heavenly midrange, clarity, air, imaging and layering/depth; weakness are at the extremes (where most low watt SET's are challenged)
My custom AM model 250's - strenghts are everything, they are just the best amps I've heard; weakness is a strong second to the heavenly midrange of my JH 300B (but still excellent)
My JH 300B SET - strenghts are a heavenly midrange, clarity, air, imaging and layering/depth; weakness are at the extremes (where most low watt SET's are challenged)
My custom AM model 250's - strenghts are everything, they are just the best amps I've heard; weakness is a strong second to the heavenly midrange of my JH 300B (but still excellent)