Humming and static noise, Plinius SA 100 MkIII

Plinius amps do have a very high background noise. All of them! I had my combo sent back, they lowered the gain. They also told me, if they lower gain at power amps(rca 32/ xlr 38), the sound they strive for, is not possible. No preamp can change this.
I used SA-102 and SA-250mk4. They sound very good, but this is either something you have to live with, or sell and buy another brand. Oh, the transformers hum, is also typical but not constant.

I noticed all suggestions, i am sincerely honest. This is not a problem outside the amp, it is the amp. I had so much argumenst with mty amps, the store even bought one back. It is accoring to email respons with Plinius, same with new amps. They told me, if i could not accept the SA-120 and 250mk4, i would not accept SA-103 and Ref amp. I bought krell after. But i have moved on. Krell is not not close in signum. maybe you should listen to older Classe gear or Macintosh. Your call!

I appreciate everyone's input. I could accept the noise is from the amps and move on, but I have tried 2 different brand amps and they all produce the same noise at different levels, so something in my system such as power source, is introducing the distortion and the amps amplify the noise. The only thing I haven't been able to try is to use the XLR connections. But my current preamp does not have balanced outputs and I don't want to invest in a new preamp, cables, etc and still have the noise. I have a home theater room with dedicated 20 amp circuit. I'll move the Plinius to that room to see if it makes a difference. After that, I have to decide to keep the amps and live with the distortion or sell and buy something like Pass Labs or Classe. The reason I originally purchased the Plinius was because it is the only amp that I know of which has a clas A and A/B selector.

BTW, when I was using my other amps to test the noise level even my wife noticed the very poor sound quality compared to the Plinius. So the chalenge continues. Thanks

Are you using balanced or RCA inputs?

Hi with my mk3,rca gives a hum and a small power surge,when i turn on the pre.Balanced it dissapears.I couldnt sell my 250.