Original poster: "Steve Conner" <steve.conner-at-optosci-dot-com> >Does toroid on a SSTC improwe output? It just about doubles the output of mine. Without toroid http://www.scopeboy-dot-com/tesla/dwsstc/arcstill.jpg With toroid http://www.scopeboy-dot-com/tesla/dwsstc/0zzt.jpg Steve C.