My friend offered me his Vox AC30 2x12 with greenbacks for $450. He says he thinks it's fixable, but he is tired of dealing with it and doesn't want to put any effort in fixing. There's no LOCAL amp repair places....Is this worth taking a chance on? Here's what I know- It powers on. There is no sound / very quiet sound coming through. Then it will cut in full volume randomly. I assume since there IS sound, this isn't a terminal problem. What else should I find out about it before I think about buying it? Any suggestions welcome !