How to Parallel Final Transistor Power Amplifier

How can parallel the final transistor power amplifier circuit? comes to a question from a visitor elcircuit.com. And whether the function of the parallel final transistors? 



First, how to paralleling final transistor power amplifier you must know the supply voltage, Emitter line, and Base transistor line, from power amplifier circuit. Then connect it to the parallel transistor, you can see