Subwoofer Circuit?..

Hi here is the circuit for subwoofer, i tried this it was nice, i just took the output from 8 and gave to another power amp. to drive the woofer, because i couldn't find those transistors.. any idea of substitute for those transistors?.
Also if you some other good circuits for subwoofer upload here..
Thanks in advance.

The very old amplifier circuit you found is a poor amplifier and has an output of only about 60W. Make a newer better amplifier with modern parts that are still available.

If you cannot find those transistors then substitutes won't help you. The transistors specified are available everywhere.