"... Van Alstine or Musical Design and thus explored their sites. Anyone have any first-hand experience with either of these designs?"
simao - I had a Van Alstine Ultra 550 power amp driving my EggelstonWorks Fontaines for a while. Very powerful and nice sound. Had grunt when needed, good strong mids and decent top end as well. After swapping out the tubes I realized I wanted more of the sound that tube amps provide so sold it for a pair of all-tube amps. Were I ever to go back to an SS or hybrid I'd consider getting another. Terrific build and service as well.
simao - I had a Van Alstine Ultra 550 power amp driving my EggelstonWorks Fontaines for a while. Very powerful and nice sound. Had grunt when needed, good strong mids and decent top end as well. After swapping out the tubes I realized I wanted more of the sound that tube amps provide so sold it for a pair of all-tube amps. Were I ever to go back to an SS or hybrid I'd consider getting another. Terrific build and service as well.