H9 yields bad hum when plugged in effects loop

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    • November 30, 2013 at 12:58 am #111231
      jackbrighton
      Participant

        I love the sound of my new H9, and everything's fine when connected in-line between guitar and amp. However, when I plug it into the effects loop of my L.R. Baggs Venue D.I. pedal, there's a bad 60 cycle hum. I checked all the cables and they're fine. There's no weird RF stuff going on, and the amp itself is grounded. Seems like this shouldn't be happening! Any ideas about why?

      • November 30, 2013 at 2:49 am #125063
        AAgnello
        Moderator
        Eventide Staff

          Sounds like a ground loop. If the amp's power cord is plugged into a socket that has a ground connection and the H9's power cord (or any other gear for that matter) is plugged in somewhere else, there could be a ground differential. One possibility is that the effects loop is grounding the H9 at the signal ground and that ground is different than the power ground. Have you tried plugging the H9's power into the same place that the amp's power is connected?

        • November 30, 2013 at 2:52 am #125064
          jackbrighton
          Participant

            I agree it sounds like a ground loop issue, but the H9 and the amp are both plugged into the same power source.

          • November 30, 2013 at 3:01 am #135849
            AAgnello
            Moderator
            Eventide Staff

              hmm. It seems like you'll have to do some experimenting and use the process of elimination. It's really unlikely that it's the H9 but you can eliminate that possibility if you have another piece of gear that you can use in the effects loop instead of the H9. Can you try a different power supply or try the power in some other place? Does the amp have a 'ground lift'? Here's a link that might shed some light on the problem. http://www.guitarworld.com/how-eliminate-guitar-buzz?page=0,1

            • November 30, 2013 at 3:08 am #135850
              jackbrighton
              Participant

                Thanks for the quick replies! I'll check the effects loop with some other gear, etc., and report back when I can. LOVE the sound of the H9, so this is going to get resolved.

                Cheers,

                Jack

              • December 1, 2013 at 1:13 am #135851
                jackbrighton
                Participant

                  Well shoot: the hum in the effects loop happens with my H9, but not with other effects devices. Could it be a hardware defect in the power supply or the H9 itself?

                • December 1, 2013 at 7:29 am #135852
                  jackbrighton
                  Participant

                    Resolved: It turns out to be the H9 power supply is the source of the hum. I found a spare 9v/500milliamp power supply, tried it with everything connected the same and there's zero hum, just H9 beauty. Just reporting back in case this happens to someone else. 

                    Cheers,

                    Jack

                  • December 2, 2013 at 6:16 pm #135858
                    AAgnello
                    Moderator
                    Eventide Staff

                      Sorry that you had a problem but happy to know that it's resolved. Please send an email to support@eventide.com so that we can arrange to get the defective supply back for analysis and so that we can send you a replacement.

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