Audio Power Amplifier for AM Radio

This is an AM radio power amplifier circuit. What is different with other general amplifier is that this circuit has a low-pass filter (passive type), built using R1C1 to limit the input-output frequency response. Additionally, a ferroxcube K5-001-001/3B with 3 turns of wire is used as ferrite bead  at output filter. All components should be spaced very close to  the IC. The ground and speaker lead must be twisted tightly. The supply lead and supply ground also must be twisted very tightly. Here is the schematic diagram of the  circuit: