🚨Jah tubbys 4way pre repair

when it arrived first thing i did was plug in power, there right away i noticed all the led light where lit full peak range on the highs and mids $ and halfways on the bass sections.. And nothing was yet plugged in except power... What came to tought is maybe is normal tuing so i continued to set up the pre to my speakers. And turntable full range method..  Once "on" the loudest high pitch screechin peaking feedback noise occured.. And this is with volume all the way down! No music at all just feedback screech.. Then tried it 4way to the sound and same thing.. Supposedly being "new preamp" i thought i was doing somethong wrong , so after reaching out to a few bredrin with a jts pre aswell for advice.. None knew what was causing that noise. Although this preamp was not bought from tubbys direct i did link him for repair and service info but is laaging on responce...  Asking anyone with the knowledge of the preamp what this issue might be. .....get a refund? Send for repair?? Easy fix??? 

My guess is the power supply is the problem..

That's just the maximum current and voltage rating for the plug socket.

Follow the rating label on the box:

Stick to 110/120v