Unfortunately, it's not the power system (all Jags run on 9VDC), but the video system that needs converting. UK systems use PAL I and USA uses NTSC. Several components on the logic board require replacement to perform this conversion. If you don't use the RF output. I think there is a single resistor that can be moved/swapped/replaced to convert the composite video. Also be advised - the game cartridges may be PAL or NTSC specific.
