do you have time constraint to look for what you are looking for? right here in this forum under "projects" is the audio amp you are looking for. although it says there that the supply is 14.4v you can still power that with 12v :shock:
okay, so how about naming a few of those power transistors, also do you mean to say that the pow. trans. that you have does not correspond to the power transistors used in the circuit diagrams that you have seen? remember that maybe the transistors that you have can be a substitute to some of parts used in any particular circuit.