Onix OA-21s low level hum

[quickie]

Hi,
I've just bought an Onix OA-21s amp which is sounding superb,but i'm getting a low level hum through the speakers at the same level regardless of input or volume.

I have exactly the same problem on a Densen Beat 100,yet an OA-22 I also have is near silent.Any thoughts?

Regards,
Paul.

 

[quickie]

^

 

[Gasho]

Onyx is low NFB design so you probabaly hearing amps electronic hum. It happends in high gain circuits