can someone give me 30w guitar amp circuit diagram?

i have this project in school, a 30w mic amp. i want to make use of it better after im done. so i decided to make a guitar amp out of it, instead of buying one. the speaker is 30w, but its max is 60w. and when i get a summer job ill buy my electric guitar (sweet! but thats another story). please help me! and please give me transistor diagrams, not valve tube. that would be expensive im only poor. but thanks anyway!