The Tube Driver and TK999 are apples and oranges. The TK999 has an active EQ for starters. And yes in the "Genz" Era they were imported (as were the rest of the pedals and rack gear). The new and original Tube drivers are virtualy identical other than the new bias tweak BK added as an option. As far as the US vs Import TK999's.... they are almost identical, although the components are better in the US version... and with any of BK's designs the tube make a HUGE tonal difference. Steve, PM me if you want all of the in depth details... Cheers!