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Old 03-03-2010, 03:41 PM   #1
 
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guitar amp hum


I am getting a bad hum/buzz in my guitar amp. I believe it is because my house isn't grounded. I am going to confirm it tomorrow with an outlet tester. If it isn't grounded....what are my options.

1. Should I get a dedicated circuit put in
2. Would plugging the amp into an isolation transformer work.

Thanks
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Old 03-03-2010, 05:33 PM   #2
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It could be a problem *with* a ground as well...
http://www.epanorama.net/documents/groundloop/
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Old 03-03-2010, 06:43 PM   #3
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Also could be flourescent lights

Running a ground depends upon existing electric setup
You can run a grounding wire...depends upon setup for what you need to do



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Old 03-03-2010, 08:20 PM   #4
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Have you tried turning down the gain on your distortion pedal?
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Old 03-03-2010, 09:18 PM   #5
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First see IF you have a ground. If you do, great. Also make sure polarity is correct.
Second, (as mentioned) see what else is on the circuit. Fluorescent lights can introduce hum.

I didn't catch whether or not is was humming with guitar plugged in. If it is humming with instrument in, then check your guitar cord. Shield touching the conductor will introduce hum in a big way. If it's humming without instrument, it will be a power question.
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Old 03-03-2010, 09:27 PM   #6
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Originally Posted by goose134 View Post
First see IF you have a ground. If you do, great. Also make sure polarity is correct.
Second, (as mentioned) see what else is on the circuit. Fluorescent lights can introduce hum.

I didn't catch whether or not is was humming with guitar plugged in. If it is humming with instrument in, then check your guitar cord. Shield touching the conductor will introduce hum in a big way. If it's humming without instrument, it will be a power question.
Or interference by a high-powered RF Transmitter!
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Old 03-04-2010, 07:03 AM   #7
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Could be a filter capacitor or rectifier (components inside) gone bad. Particularly if the hum is the same regardless of volume or input selector settings.

It is not a bad idea to ground electronic equipment externally particularly if the equipment does not have 3 prong power cords. Run a 14 or so gauge wire from one piece to the next, screwing it on in a manner that contact (bonding) is made with the chassis via the screw if not directly. Connect the far end of the wire to a known ground, which in some cases can be the screw that holds the cover on a wall receptacle.

Even with proper or added grounding, a bad filter capacitor or rectifier must still be replaced to get rid of hum.
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Last edited by AllanJ; 03-04-2010 at 07:13 AM.
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Old 03-04-2010, 08:13 AM   #8
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I've always heard things hum because they don't know the words
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Old 03-04-2010, 10:08 AM   #9
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Try the amp


at a friend's house that has a modern grounded electrical system. Then you will know whether it 's a problem with the amp or your electrical system.
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Old 03-04-2010, 10:12 AM   #10
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At church we use DI boxes to help get rid of the hum on a few things - acoustic guitar and the keys. It seems to help.
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Old 03-04-2010, 10:15 AM   #11
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I have an old kalamazoo amp that doesnt have a polarity switch on him. when it is plugged in and makes a hum I unplug it, turn over the plug and stuff it back in. It doesnt always cure all the noise but sometimes it does. Floresent fixtures and refrigerators are sometimes the culprit as well.
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Old 03-04-2010, 12:22 PM   #12
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Originally Posted by AllanJ View Post
Could be a filter capacitor or rectifier (components inside) gone bad. Particularly if the hum is the same regardless of volume or input selector settings.

It is not a bad idea to ground electronic equipment externally particularly if the equipment does not have 3 prong power cords. Run a 14 or so gauge wire from one piece to the next, screwing it on in a manner that contact (bonding) is made with the chassis via the screw if not directly. Connect the far end of the wire to a known ground, which in some cases can be the screw that holds the cover on a wall receptacle.

Even with proper or added grounding, a bad filter capacitor or rectifier must still be replaced to get rid of hum.
Just for the record. And (limited) personal experience. Even a Full-Wave (A/O Half-Wave) Rectifier will yield a "Humming" DC circuit. A Filter Capacitor of sufficient Capacitance (different from Capacity) (mfd.) will "Smooth" the circuit, eliminating the "Hum". When hooking up DC Relays for a Control circuit, where the power is derived from AC, is one of the cases where the difference is most visible.!
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Old 03-04-2010, 12:46 PM   #13
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From my years playing bars and weddings and parties, I've found 9 times out of 10 it's a loose connection in the guitar jack itself and usually just swapping to a better (I like ProCo) cable fixes it. I use Excaliber for my bass.
When you get the time, re-solder the loose wire in the jacket. Second culprit is loose connection inside the guitar socket, a bit harder to fix, but still simple.
Any musician knows the cables get yanked a LOT when you jam, this is the main reason I hard-wired a NADY101 to the back side of my Gibson CSE bass.
I LOVE PLAYING WIRELESS!!!

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Old 03-04-2010, 01:21 PM   #14
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Quote:
Originally Posted by DangerMouse View Post
I LOVE PLAYING WIRELESS!!!
I have always wanted to get a wireless adapter for my guitar, would be so much fun....I probably should have gotten one while I was actually in a band. It wouldn't do much good sitting in my basement
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Old 03-04-2010, 01:31 PM   #15
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I talked Tommy into getting one for his lead, he also uses a zoom.
We love dancing with the gals while we jam out front....

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