Buy 12ax7 tube

I read in my dac guide that if i connect directly to a power socket it will have a better sound quality
But im using and old and cheap electric tee for my amp and dac
Maybe the power is the problem?!

*electric tee(electric multi plug)

Can you hear noise (with no music) from your listening position or only up close to the speaker? It could easily be noise from tubes, but your power setup is far from optimal.

 You should use a quality power strip or a strip with power conditioning, not a multi-plug. It's like you're choking the flow of  electricity (AC) going to your system.

In addition to the Vincent, what are your components?

I just hear noise when im near the speakers,off course i should buy a good multi plug,can you recommend me anything?

Dac: burson da160(i think its best part of my system)
Speaker: dls r55
Speaker cable vdh gold water
Rca cable ifi(i have a tchernov standard series too)
Usb cab 2$ dayio cable!

Volume up or down dont effect in the noise background

Its quite same!