On the rig exchange you can find many profiles of an amp called Kingtech VA15H, made by JOHNSON DU.
I dig them!!!! Especially the ones with SM57 on axis.
Anybody here who knows more about that amp? google is as clueless as I am....
Some nasty fellow gave all of these profiels a 1star rating - bullsh*t!!!! Give ´em, a try!
Cheers to JOHNSON DU!