acoustic guitar hum

Discussion in 'Guitars' started by Smashh, Jan 9, 2015.

  1. Smashh

    Smashh Active Member

    Joined:
    Oct 12, 2012
    Location:
    Australia
    Hey guys , I'm hoping someone can help here with fixing an earthing hum on my steel string acoustic guitar.

    It has a Fishman infinity pre amp and piezo under saddle pick up installed.

    Observations : If I touch the metal end jack insert the hum goes away ,
    I put one hand on the mixing desk the hum is gone ,

    Can someone chime in here who has been through this and point me to a simple solution.

    I have read posts where they suggest there is a problem with the pick up ,( hope its not )
    I thought about earthing the guitar to the desk with another cable ....lol

    cheers and happy New Year !
     
  2. Makzimia

    Makzimia Well-Known Member

    Joined:
    Aug 20, 2014
    Location:
    Falkirk, Scotland
    Home Page:
    G'day mate :),

    Does the desk hum?
     
  3. Smashh

    Smashh Active Member

    Joined:
    Oct 12, 2012
    Location:
    Australia
    G'day there Skippy Ranger :).
    We are in for the first cyclone of the season next week here in the FNQueensland .

    The desk is fine all channels are quiet , its a passive sound craft , must be 10 years using it now and it all works . knock on wood ...
    The only problem with the desk was a pesky rat or mouse that liked to chew one of the knobs when we left it set up on Dunk Island .
    Funny thing is it went for that same knob and chewed half of it off , I didnt realise what was going down in the middle of the night...lol

    AH ha , I just recall , the hum actually went away when I earthed it ( touching the input jack ) , and came back after about 5- 10 seconds ( after unearthing it )
    Just in case that could help in diagnosis
     
  4. Makzimia

    Makzimia Well-Known Member

    Joined:
    Aug 20, 2014
    Location:
    Falkirk, Scotland
    Home Page:
    Have you tried any other instrument to see if you get a hum?. I am just trying to see if you're getting a loop hum or if in fact the pickup jack is the cause.
     
  5. Smashh

    Smashh Active Member

    Joined:
    Oct 12, 2012
    Location:
    Australia
    I plug other guitars in through the same fx pedal and leads with no hum
     
  6. Makzimia

    Makzimia Well-Known Member

    Joined:
    Aug 20, 2014
    Location:
    Falkirk, Scotland
    Home Page:
    Well mate, looks like you unfortunately, answered your own question. I would be checking the connections on the acoustic now.

     
  7. paulears

    paulears Well-Known Member

    Joined:
    Feb 7, 2014
    Location:
    Lowestoft - UK
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    If earthing the guitar jack to the desk works, then I'd be quite happy, and if swapping the lead shows it isn't a cable fault then it's perhaps the jack - but if connecting an extra ground works, why worry?
     
  8. Smashh

    Smashh Active Member

    Joined:
    Oct 12, 2012
    Location:
    Australia
    Yes I guess Ill run an extra lead from the input jack to the chassis of the desk . It just bugs me that surely it should be working properly without having to go there .:whistle:
     
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