Ground Bus

[Davebassman]

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?

[Helmholtz]

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. .

[J M Fahey]

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, it´s not hard to do.

[Davebassman]

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, it´s not hard to do.

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

[Helmholtz]

Any redundant chassis connection produces a ground loop. Large area loops are worse than small ones. Small area loops may go unnnoticed.

[nosaj]

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

What book is that from?
nosaj

[Davebassman]

What book is that from?
nosaj

Vacuum Tube Amplifier Basics by EJ Jurich

[Helmholtz]

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.

[Davebassman]

What do you think about this layout and the ground bus? Some advice?

https://diyaudioprojects.com/Tubes/6...1-SE-Tube-Amp/

Thanks