Thanks for the advice. I don't think it is because of the interconnect though. I got the noise since the first day I got this preamp, then I upgrade the interconnect, and the noise is still there. Maybe some capacitor are old? Inside, there is a sticker says it is checked in 96. So, it is a 14 years unit. Is it about time to have a service and replace some capacitor?
I did some more listening, the Main 2 out seems work for me. It remains musical with good sound stage, and the harshness or glare is improved.
I did some more listening, the Main 2 out seems work for me. It remains musical with good sound stage, and the harshness or glare is improved.