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  • Ground Bus

    Hi,

    I'm planning to build my first tube amp with Tag Strip boards. But I have a question about ground bus bar and ground loops. If I mount some tag stripes board, and one of the tag goes to chassis with a screw and I solder the bus bar and goes to another ground tag... this is a ground loop?
    Attached Files

  • #2
    I would need to see whole picture/grounding scheme and points.

    Ground loops are created when there is more than one path between grounded nodes, thus providing undesirable loops for currents in the grounding system. .
    Last edited by Helmholtz; 09-15-2020, 04:26 PM.
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    • #3
      Originally posted by Davebassman View Post
      Hi,

      I'm planning to build my first tube amp with Tag Strip boards. But I have a question about ground bus bar and ground loops. If I mount some tag stripes board, and one of the tag goes to chassis with a screw and I solder the bus bar there and goes to another ground tag and again solder it there and so on ... this is a ground loop? (red text added for clarification)
      Yes, definitely.
      For the thicker wire bus bar to work as such, it must be floating from chassis an d only touch chassis ground at one point: main power supply ground.

      That said, itīs not hard to do.


      Juan Manuel Fahey

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      • #4
        Originally posted by J M Fahey View Post
        Yes, definitely.
        For the thicker wire bus bar to work as such, it must be floating from chassis an d only touch chassis ground at one point: main power supply ground.

        That said, itīs not hard to do.

        Yes. That was I always thinking. But I have a tube book that the author uses this way.
        Attached Files

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        • #5
          Any redundant chassis connection produces a ground loop. Large area loops are worse than small ones. Small area loops may go unnnoticed.
          Last edited by Helmholtz; 09-15-2020, 08:29 PM.
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          • #6
            Originally posted by Davebassman View Post

            Yes. That was I always thinking. But I have a tube book that the author uses this way.
            What book is that from?
            nosaj
            Binkie McFartnuggets‏:If we really wanted to know the meaning of life we would have fed Stephen Hawking shrooms a long time ago.

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            • #7
              Originally posted by nosaj View Post

              What book is that from?
              nosaj
              Vacuum Tube Amplifier Basics by EJ Jurich

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              • #8
                The book implies that a copper (ground bus) provides a lower resistance path than the chassis. This is not generally true. While copper has around 60% better conductivity than aluminum and about 600% better conductivity than steel, the much larger cross section of the chassis typically more than compensates for that.
                Last edited by Helmholtz; 09-16-2020, 01:16 PM.
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