Tube PHONO preamp interference - RFI, EMI, bad grounding?

@filipm , making a phono pre-amp is not rocket science. Good low noise design, good quality transformers (if they are MC and use them), precision parts for the RIAA curve, and some other basic engineers concepts. When it comes to tubes as well, your cartridge likely has enough distortion that the distortion of the tubes almost does not matter.

In my experience, most of the "sound" from a phono preamp comes from the matching between the cartridge and the preamp, and not some inherent advantage or disadvantage of the preamp. If it does not at a minimum have several matching resistor choices for MC and MM, I would not want to use it. Even then, for an MC, a mix of capacitor and resistor matching will yield the flattest response. I am not saying that is your personal goal, just it can be.

Why this matters is don't get hung up on your particular preamp. I would be taking it to a friends house and verifying there is not noise in a completely different location so that you can sell it. Then I would buy a preamp with a good range of matching resistor selections so that you can tune the sound for your cartridge.

Thanks for letting me know what model.

Was wondering about  provisions for a MC cart.

Asking to see what else is inside the box that might be picking up the signal?

And the unit is solid state rectified, all three tubes are used in the signal path

Heres an obvious, and silly question, but are the tubes properly seated in the sockets? Could they have been jostled with all the moving about?

Definitely WiFi or cell phone antenna too close to inputs. I've added a small RF filter to the front of my stages to combat this.

@hagtech What RF filter are you using? There's many and don't know anything about these. 

Looking at the guide, it's definitely not hum or buzz. I know what to do to make them appear.

This is a very sharp beeping sound with a pulsing bass driver, I have posted the sample afterall. It's the same every time. 

What's interesting I can hear the same noise coming from my laptop charger sometimes. Of course it's not the source, one of the first things I unplugged.

@lewm I have taken the cover of the EAR off, with the tubes exposed, the noise doesn't get any stronger. Do you think the interference could get into the Faraday cage and be stopped by these aluminum hats? Maybe I could use an aluminum foil instead, just to see if it makes any difference. 

I'll try different tubes next week, even tho I have read they cannot be returned. Mullard CV4004 or Tung Sol gold pin.

@perkri yes, the tubes are sitting well in the sockets. I have taken them out and changed their positions too. 

@theaudioamp The building isn't the tallest in the area. I have checked the google map, recently updated by the way and there's nothing visible on our roof or on any roofs near by. 

An electrician is gonna stop by with a 12V battery that can power up the phono preamp. That should definitely eliminate a possibility of a noise coming from the electrical network. 

I'm sorry if I am beating a dead Horse. I feel you shouldn't have to sacrifice good quality sound. I must restate that you should look for the source after a reasonable effort to protect your equipment. In doing so I would first follow up on your failed effort of putting a pan over your equipment and actually try to build an impromptu 'faraday cage'. the theory isn't that hard and some light reading should provide you with some inexpensive solutions. Once you find where the noise is entering your system, you can research what type of source might create this type of spurious signal. Also though unlikely look into all of your equipment power supplies to see if you have a failed filter. Even a $1,000 power supply could have an occasional bad capacitor.