amplifier noise question

Icelander53

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Totally new to amplifiers. I bought a little Vox Mini 5 that runs off either electric or battery. When I'm running off house electricity there is a hum from the amp and when I touch the 1/4 in plug into my Uke it quiets the hum. So I'm acting as a ground I guess. Is there a way I can make the hum go away or is this a defect in the amp? I don't think it's the amp because it isn't there when running on battery. Any help would be appreciated.
 
Don't have cable but do have my computer line in the same room. I have another amp in there and it doesn't do it on that amp?
 
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