trinityamps.com

In the Trinity kits I see some copper wire for bus ground. In some amp layouts I do not see this.
Here is an example

https://www.dropbox.com/s/5og36yddsy63bsi/SL68.jpg

How is the grounding done in this case?

The "buss" could be on the underside of the board. Also not all layouts use this style of grounding. There are star ground systems and galactic grounds. Some run a buss across the pots, soldering to the pot bodies and grounding to that.
In the picture you can see a ground points at the bottom end of the 2 black electrolytic caps near the left side. I suspect there is a wire joining those 2 points under the board. Then from there probably to a ground lug near the power supply. ..just an example..

Only on the 18s did we ever do a Buss Bar. We have recently dropped that in favour of the new layout. For Trinity Amps, there is a jumper on the board between the pre amp grounds and another for the power grounds. They go to different grounding locations.

On the amp in the picture, I expect something similar. It looks pretty but it might be tough to service it if the board needs to be lifted !!

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

This is a Plexi bei John Suhr BTW

Interesting does he use SOZO coupling caps or any carbon comps in there? Doesnt look like it.

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Interesting does he use SOZO coupling caps or any carbon comps in there? Doesnt look like it.
Don't think so. I have his Badger also. I chould check what he uses if you are interested.

If you Google tube amp grounding you'll get a ton of material. There is many ways to implement a grounding scheme in an amp, some very well done and some poorly executed. There is no one right way either, every style/scheme has it's pros and cons (as noted here).

Nice looking amp in the pic.

_________________
http://pdfelectronics.com