Anyone know how to solve the hum problem from SP10?

Hi DIY friends,

I builded my SP10 few months age, but I still can't fix the humming from it.
Anyone can share the experiences for solving hum problem for SP10 kit here, It must can help the people who bought it and with hum problem.


Thanks

Hi losin: I was checked the pcb ground connections and rearrange the power connection for selector and output protector again, then I found the hum sound was decreased. Thanks