Hi all! I am hoping to transform my Warwick Thumb from a 9 volt, to an 18 volter, I at this point don't have the money for a luthier to do this professionally, so I am going to have a friend do the work for me for free. (he is an electrical engineer, whose specialty is to work on amplifiers, who has 30+ years of experience building and testing electronics), but something we both need to know, will the current 3 band electronics handle 18 volts? or will I need to have something done to them? any help will do, thank you!