I got one of these from battradio for use in a guitar amp (although I'm planning a mono ipod dock corner speaker thing and it might end up in there) and I'm about to get started. There are quite a few posts on these here and I think I looked at all of them, but I have not been able to spot the original schematic for one. Can anyone help me out there? It is simple enough that I would prefer to first restore it to the original functioning condition, and then go from there.