Yeah, what he said. The 6505 is the 5150, the 6505+ is the 5150 II, the cabs are the same. All they've changed is the cosmetics on them. They added the new (old) Peavey logo, and changed the number from 5150, to 6505, I think its in a different spot too. Oh, and no EVH signature on them. Otherwise, same amp.