I'm anticipating some upcoming gigs with my band at some venues where we will be hooking up to a PA. The amp I'm currently using, the Ampeg B-50R, does not have any external outputs of any kind, besides the headphone jack. So my question is, is it possible to hook up to a PA through your headphones jack? I'm pretty sure it is, but I'd like to be certain. If not, I guess I'll be buying a new amp sooner then I originally anticipated.