Update:
The dealer sent me another unit, this one worked well for 6 hours. Then the remote receiver stopped working, not the remote, I have 2 because I still have the other pre.
Sincerely I’m really sad about of this kind of quality control, one is out of standard… noise and whining, and 200 ohm load is not working, the other one without remote receiver… and is very bad in an unit that you cannot use without!!!