So I've got this amp. It was bought at a yard sale and has some switch added that does nothing, and a Master Volume knob added. I plan on having it unmodded and overhauled. Anyone have any soundclips of one of these or what I should expect? It also has the matching cabinet. Not sure if it is 2x12 or 2x15s but the speakers need replacing as well. What speakers came from the factory with this amp? I want to try to keep it as original as possible so any info will be helpful.