I have done a few conversions from 6 volts to 12 volts and these work fine in the main. Last one I used a 12 volt battery with a 6 volt tapping put on by the battery maker. The 6 volts were just for the fuel gauge and the semaphore solenoids. All worked automatically with relays. I even got the semaphore bulb flashing. Moving on, I want to do away with the 6 volt tapping so I can use a modern sealed battery without the lead bars on top. I have been looking at 12v to 6v regulators using a power transistor and a few other electronic bits. Has anyone here had any dealings with such a regulator or made one up? I have an article by Steve Delanty which spells it out pretty clear and describes one that will cope with over 10 amps which should cover my solenoids but before I go ahead and make one - is there one on the market at a reasonable price?