LM390 power amplifier schematic

Circuit schematic above is / include power amplifiers that have low power output. 1 Watt output power is only based on the IC , and ic used LM390 , manufactered by NS and ic packaged in DIP-14. For output impedance have 4 OHm. Requires a minimum voltage 4 Volt and Maximum voltage is only 9Volt.
Part List :

Resistor
R1________33K
R2________510R
R3________510R
R4________2.7R

Capacitor
C1________100uF 16V
C2________100uF 16V
C3________10uF   16V
C4________220uF 35V
C5________10uF   16V
C6________100n

IC
IC1_______LM390