Nad capacitor

[try to fix]

Hello,
My NAD t973 amp has just developed a hum on all 7 channels. so because the problem existed on all channels, I looked for the common component which was the power supply. Upon disassembly, I visually inspected the power supply but found no issues. Would anybody know which component should I zoom in?

Regards

 

[soundguruman]

does the amp hum with all the inputs disconnected?

 

[try to fix]

does the amp hum with all the inputs disconnected?

Thanks for your reply,

Yes the hum exisistes with all the inputs disconected.

Regards