The schematic has been altered to allow a higher charge current flow
The first version of the CoilMaster has a 150W bulb as charge resistor, at the time I was pretty fond of the (relatively) short charge time. But I recently realized that it could be improved by a LOT. This upgrade takes charge time to the next level. In stead of one 150W bulb now 2x1000W halogen tubes are used, the entire charge circuit had to be upgraded to handle the peak currents.