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Old 05-10-2011, 11:50 AM   #1
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Electrical Hum

I'm not sure if this is the right area to post this, but here goes, I play Bass guitar, I have a new guitar and new bass amp, everything I play through developes a hum, In the Amp, through the Personal Aviom mini mixer, the sound tech says that it is either my guitar or my amp, when iI use the headphones on the Aviom there is a bad buzz that starts, when I play through the amp only and do not use a DI out box there is no hum, Question, can a ground look problem cause the buzz, I don't know how to find the problem or fix it, Thanks, Leaderman


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Old 05-10-2011, 11:53 AM   #2
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Ground loop = majorly annoying and can be VERY hard to locate. Maybe some of the sound guys can suggest an isolator.

After a recent DIY car stereo install we've got such a nasty ground loop hum that usually the stereo stays off (until we can take the whole darn thing apart)


If I could only remember to THINK about what I was doing before I did it.
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Old 05-10-2011, 01:15 PM   #3
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What happens if you take your equipment to a different location, a whole other building?
Start a process of elimination and only change one thing at a time.
With just the amp plugged in, try a different bass using the same cord.
Try a different cord
Try your bass in a different amp.

You said the amp and bass are new so I can assume the amp has a grounded plug. What about the wiring in the building?

Years ago, before grounded receptacles and polarized plugs, just flipping the plug 180 deg sometimes reduced or eliminated hum.
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Old 05-10-2011, 01:24 PM   #4
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Is the hum still there if you unplug the guitar from the amp?

Does the hum get louder and softer as you adjust the amp volume control?
The good conscientious technician or serviceperson will carry extra oils and lubricants in case the new pump did not come with oil or the oil was accidentally spilled, so the service call can be completed without an extra visit.
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Old 05-10-2011, 01:35 PM   #5
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Is there any dimmers for lights by chance? Those cause more of a buzz than a hum though, but worth checking. If they are off or full it wont do it but if it's half way it will. Start unplugging other stuff around the house too to see if you can isolate it to something causing noise on the line. also try on different outlets as suggested. If you can isolate the situations where it does/does not do it then you can go from there.
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