Hi Jerome, have you been thru the Stagg thread there are I blelieve others that have had a similar problem. Ground issue I believe. Did you purchase it online for from a store or an individual? If you purchased it from a store bring it back and have them sort it out, if you can watch what they do and learn about your new instrument. There is a wealth of information about moding the Stagg EUB. Here is the link to the hum article:
http://www.talkbass.com/forum/f101/stagg-eub-megathread-344951/index5.html
I hope this helps you sort it out.
http://www.talkbass.com/forum/f101/stagg-eub-megathread-344951/index5.html
http://www.talkbass.com/forum/f101/stagg-eub-megathread-344951/index5.html
I hope this helps you sort it out.

http://www.talkbass.com/forum/f101/stagg-eub-megathread-344951/index5.html
