Original poster: "Steve Conner" <steve.conner-at-optosci-dot-com> >putting IGBTs in a >machine-gun ammo belt arrangement LOL! Seriously though, I don't see any fundamental barrier to getting good reliability. It just means not running the IGBTs as hard as we like to currently, and so getting somewhat less inches of spark per dollar spent on silicon than we are used to just now. Steve C.