https://pdf1.alldatasheet.com/datasheet-pdf/view/423632/KEC/C9014.html
here the datasheet of the C9014 which is a low-power general-purpose npn transistor, below I attach a preamp stage in which you can use these transistors, obviously you should look for the C9014 COMPLEMENTARY and the other components there is an excellent circuit power.
http://electronica.ugr.es/~amroldan/modulos/proyectos/amplificador_100w/archivos/etapa_de_potencia_para_100w1.htm
successful and I hope you like this preamp stage