2,3 W Mono power amplifier schematic

This amplifier circuit using ic BA534 as a main amplifier, manufactured by ROHM ic, and packaged in SIP1-8. This amplifier circuit has a maximum output of 2.3 Watts with 4 Ohm impedance. Frequency response is between 30Hz to 18KHz. For the voltage needed at least 9 Volt and 13 Volt maximum. For a list of components can be seen below.
Part List :
R1 = 50K trim
R2 = 33K
R3 = 68R
C1 = 2.2uF
C2 = 220uF
C3 = 100uF
C4 = 47uF
C5 = 470uF
C6 = 100uF
C7 = 47uF
C8 = 100n
U1 = BA534