I just got a new Matchless Avalon 30 head and cab, and I don't know how to plug the head's AC power cord. Specifically, the power cord is not the normal two- or three-socket cord that plugs into the wall of a normal house. Rather, it's got two round prongs and it says 16A 250V on it. What do I need to power this amp? Sorry for the stupid question, but I'd really like to play with my new toy today and over the Christmas holiday. Many thanks in advance!