Buy 12ax7 tube

Volume up or down dont effect in the noise background

Its quite same!

It's good that you only hear noise when up close to the speakers. The fact that the noise is constant even with volume down either means your amp is the problem, or more likely it's due to noise on your power line. This is the noise floor of your system, the goal is to lower it until you have a "black background." 

 Your AC line comes from the power grid in your city/town and is shared by everyone in your neighborhood, then it's wired into your service panel, then travels thru all the circuits in your home. At this point your electricity is contaminated, or polluted may be another way to describe it.

A power conditioner is typically recommended and/or a dedicated line to lower the noise floor by  isolating your system from the rest of your devices and appliances.

Your budget will determine what kind of power conditioner to use. A basic unit would be a Furman power strip/conditioner.

Mehdikh423-Following up on Lowrider57's suggestion. I purchased Brick Wall audio surge protector and this helped lower floor noise on my Cayin 50T amp.

https://www.brickwall.com/products/eight-outlet-audio-surge-protector

The New Sensor Svetlana 12ax7 is a very good sounding tube.  I have yet to try a Gold Lion 12ax7  in my amp's input but I have tried a bunch including some nos and the Svetlana is one of the better sounding current production.  JJ ecc83 were dark in my amp, Sovtek LPS were ok but not great,  mullard repop good, tungsol repop good but a little too much energy on top.  The Svetlana is currently in the input of my amp 

Thanks everyone for your advices
I have another question,can bad electricity reduce dynamic of sound and cause bloated bass?