HEY i have a YAMAHA keyboard and looks like we through away the power cord. Woops! i need to get a new one and the keyboard says it takes a PA-3B or a PA-3C AC Power Adapter. Whats the difference. Or i guess the Main question: Which one works better? Ive never really used it before and want to start using it. I have no idea what the difference is but I'm sure they didn't just decide to give something 2 different names. Help anyone?