I'm interested too as the 350A has been the cornerstone of my system. While other components have changed in my system, the 350A has remained (although I would like to try one of those Krell KSA150s).
Belles 350A Reference Version upgrade
Any 350A owners contemplating sending their 350A back to Dave to have the Reference upgrade performed?
Link to the upgrade news:
http://www.powermodules.com/newdev.html
Link to the upgrade news:
http://www.powermodules.com/newdev.html