PT hum noise [resolved]

[peterq]

Hi,
I can hear some PT hum although it's very low, but it's still there. The hum noise could be decreased a lot when I touch the panel, is there a way to solve this issue? I see the amp properly connects power ground wire. Thanks.

 

[Paul Birkeland]

Are the screws nice and tight?

 

[peterq]

Hi Paul,
I didn't expect you to reply this late time. It's my bad, I put amp on a small desk, when I put a heavy item on the amp, the noise stopped. It looks like there are something has resonance when I turn on the amp.

 

[Paul Birkeland]

I would suggest tightening the power transformer screws.

 

[peterq]

I put the amp on a more robust shelf and pt hum is away. Thanks PB.