My amplifier is receiving a humming sound from the audio signal what should i do
Separate the input ground and power ground, also use shielding wires at audio input and volume control. This will definitely solve your problem. The humming can be eliminated if the input ground is directly connected to the main ground. Mostly a ground loop does the hum go away when the sources are disconnected.
You might have a high ripple on the dc, check your filter capacitors. I normally just replace them. Thereafter check that the dc voltage is within tolerance. Secondly, check your input signal cable, ensure that the cable is screened and connected to the negative properly and not near the AC transformer or the mains cables. There might be other factors as well