Help diagnose rig issue

Discussion in 'Pickups, Electronics & General Tech' started by mniel8195, Mar 6, 2019.

  1. mniel8195

    mniel8195 SS.org Regular

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    I have taken the my pedal board out of the equation for this issue. My signal chain is as follows. Suhr modern running into Friedman small box. I have the 8 ohm tap going into a suhr reactive load ir and i am monitoring through headphones.

    I have the amp cranked and I am getting a ton of hum. The hum goes away when i touch anything metal on my guitar or on the reactive load. I never had this issue before. I noticed it when I plugged my eqd erupter in and it made a crazy hum sound when I turned it on. It stopped once i touched the instrument cable jack. I have gone through my guitar and done continuity tests with a multi meter. The only thing that gives me a different reading from all the other test points is the 5 way switch. Some of the readings look like the pickups resistance. Parts of the switch give me a different reading all together instead of all 0's. I have also done continuity checks on all of my cables and have even swapped power cables and instruments cables when checking for issues. I have also tapped all of my tubes to see if anything is micro-phonic. No issues with the tubes that I am aware of.

    I also plugged my guitar into my boss katana and I did not get any of the humming or the grounding issues with the guitar. I did not have it hooked up to my reactive load IR either. I also plugged my guitar into my smallbox and went through my speaker cab. The amp seems to make more idle noise than I remember when I have the volume all the way up on my guitar when I am not playing. But it could also be the room itself. I honestly can't remember. I have also switch power outlets in my house. Everything is using 3 prong outlets so i would assume everything is grounded. Like i said I did not have the issue before.

    Not sure where to go from here. Part of me feels like my 5 way switch has come underground but I am not sure how to check. My amp sounds fine so I am worried that something has become underground in the suhr reactive load IR.
     
  2. Descent

    Descent SS.org Regular

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    Change cables?
    Try different el. outlet.
     
  3. mniel8195

    mniel8195 SS.org Regular

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    I wrote in the post that I have done all of that. The only thing I have not tried it the speaker cable running to the Suhr reactive Load IR
     
  4. MerlinTKD

    MerlinTKD EIght.Fold.Path / Hinge Theory Contributor

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    If it goes away when you touch metal in the signal chain, seems like it has to be a grounding issue. Now, how to fix that, I have no idea :shrug:
     
  5. mniel8195

    mniel8195 SS.org Regular

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    I spoke with Suhr and they said for me to try and duplicate the issue when going directly into the amp at the loudest setting I would normnally play. They said I may not experience the noise through the speaker cab when I have it at a low volume. I need to get it to the level that I have it when going through the reactive load. They also said it is very unlikely it is a grounding issue in a brand new guitar or a brand new reactive load. I am guessing it is something wrong with the amp or my cables.
     
  6. Descent

    Descent SS.org Regular

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    Sorry...I missed that.

    Try different outlet, also make sure you didn't add anything to this el. outlet, like a lamp or such.

    Sounds like grounding issue...possibly guitar ground also got disconnected.

    Does your amp have ground switch on the back? I have some that do.

    Sounds like you might need to try power conditioner if these ^ fail.
     
  7. Descent

    Descent SS.org Regular

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    Also - forgot to mention but it could be tubes. I've had some super cheapo preamp tubes that do that as well.
     

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