Hum at gig

Discussion in 'The Workbench' started by Weldaar, Jul 14, 2019.

  1. Weldaar

    Weldaar Member

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    I played a gig last night and there was a pretty bad hum coming through my Friedman.
    I'm thinking that the lights that were back of the stage where we set up. Christmas type lights in the shape of an American flag. Loved the lights, but not the hum. Is it wise to use a ground lift on these circumstances? I never thought that was a good idea. I do use a Furman power strip. Opinions?
     
  2. ricksconnected

    ricksconnected Well-Known Member

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    which Friedman
     
  3. Weldaar

    Weldaar Member

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    Runt 20 X S.jpg Runt 20 head.
     
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  4. ampmadscientist

    ampmadscientist Well-Known Member

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    Start the reactor... Free Mars!
    Tell us about ALL the connections to the amplifier, in detail.

    You need to describe with more details where the power is coming from, and what equipment is plugged into "which" power receptacle.
    You may have a ground loop, but you need to identify where the ground loop occurs first.

    It really has nothing to do with the amplifier itself.
    You do not lift the ground on the amplifier power.
    Carry one of these in your guitar case.
    [​IMG] This tells you that the power is wired correctly, and that there is a real ground at the receptacle you are plugged into.
    Test all power receptacles that your equipment is plugged into, if there is a wiring error do not use the receptacle(s) that tests bad.

    2. Use an extension cord to move audio power to a different power receptacle and check again for hum. Try to isolate the lighting power from the amplifier power.

    3. Power strips / power conditioners do nothing to prevent a ground loop. These devices do nothing to correct bad power.
     
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  5. Weldaar

    Weldaar Member

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    Yes, most places are suspect to how they are wired. it's not all places, seems to be certain smaller venues.. I do have a tester like you show. Maybe I will start bringing it with me. Great idea. Most place only have one or two outlets and probably on the same circuit. The only thing on my power strip is my amp and the PA head. Unfortunately the other outlets maybe on the circuit as well and they do use lights in front of the band (which I hate BTW) I know that florescent lighting can wreak havoc with musicians.
     
    Last edited: Jul 14, 2019
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  6. ricksconnected

    ricksconnected Well-Known Member

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    i want one very bad lol. you can gig with this beast no problem?
     
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  7. Weldaar

    Weldaar Member

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    Yeah, has lots of punch. Wish I could play louder than I do LOL play smaller venues. Got plenty of volume left
     
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  8. tallcoolone

    tallcoolone Well-Known Member

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    I play some small places but 1 or 2 outlets?

    That’s a “She-Shed” lol!
     
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  9. Weldaar

    Weldaar Member

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    I am playing at a place with one outlet. Should be a trip. Not a small place either
     
  10. ricksconnected

    ricksconnected Well-Known Member

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    a gig is a gig.
     
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  11. ampmadscientist

    ampmadscientist Well-Known Member

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    Start the reactor... Free Mars!
    You need to show how it's all hooked up.
    There is not much troubleshooting without information it's just guessing.
     
  12. ampmadscientist

    ampmadscientist Well-Known Member

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    Start the reactor... Free Mars!
    Then start by testing your stage power outlets with the tester and find out first if that power source has a ground to it.

    In this building there MUST be other power outlets.
    Use a 100 ft cord extension to reach another power source that is separated from the lighting.
     
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  13. KraftyBob

    KraftyBob Well-Known Member

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    When I first read your post my mind thought 'Hummer at gig" and I was thinking 1) good for you, and 2) this post really belongs in the Backstage forum. Then I re-read it...

    Good idea bringing a tester to gigs!
     
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  14. ricksconnected

    ricksconnected Well-Known Member

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    like a best friend or something?
     
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  15. KraftyBob

    KraftyBob Well-Known Member

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    That’s funny lol
     
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  16. Jethro Rocker

    Jethro Rocker Well-Known Member

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    We have a venue here that always has some hum out of 1 oitlet. Picked another and it's fine. The big neon sign in back that goes off when you play really does it too.
     
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  17. Weldaar

    Weldaar Member

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    I use a Power Werks or a Furman power strip to power my home made DSCN7487.JPG small effects board that has onboard power that my amp plugs into. My board has, Memory Man Analog Delay, Ibanez Flanger, Boss Harmonist)
    and the PA head also goes into my strip. This is the homemade board. It's actually an attache case LOL. Works for me.
     
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  18. ampmadscientist

    ampmadscientist Well-Known Member

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    So does the noise go away when the stage lights are shut off completely?
     
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  19. Weldaar

    Weldaar Member

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  20. ampmadscientist

    ampmadscientist Well-Known Member

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    Start the reactor... Free Mars!
    Then buy the noise filters install on both the lighting power and on the amp power.
    Or separate the power sources from each other.

    [​IMG]
     
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