It is no wonder that the schematics can be miss-leading. I doubt that Mesa used any form of CAD to create the PCB designs. Considering the Roadster, it is evident it is tape on film so the schematic is just for reference. At least they managed to upgrade how they create the schematic. They used to be hand drawn. I should take a closer look at the Badlander boards to see if they were made by CAD or hand-taped on film.
It is hard to tell with the Bad board. It almost looks CAD but there are some signs in the copper pour (large copper areas- typically ground plane) that it may not be CAD. Traces are not rounded like the older designs, instead it uses 45° angles to make bends. (Most CAD programs will use this method, they do have arcs too but not splines, at least not the CAD programs I am familiar with.) What indicates it may be something different are the fine rounded corners on the copper pour, some of the corners are rounded off and some are not. If it was a CAD and if they know how to use it, you can set the minimum distance from nets based on the applied trace voltages. For traces that would have the full plate voltages, in relation to the traces that would be based on the 12V circuits for the relays and such would have a different spacing. So this layout does look like it was CAD driven, not sure if it was though. CAD designs are done in a 1 to 1 scale. Tape on velum or film is done at a much larger scale compared to actual size. Besides, the legend is more readable as it was not hand drawn on a large velum before it got reduced to the proper size by photo reduction onto a film.
Here is a closer look at the MWDR board. I can tell that this was not CAD generated based on the radial curves. They are more or less a spline than what you would get with the arc mode on a CAD. I did not have a good picture of the Roadster to use. The MWDR came out after the Roadster so it is fair game. When taking a closer look at some the layouts, it almost appears as if they are not quite aware of IPC standards. Usually based on the annular rings on the vias or pads on the components. Sorry for the technical stuff here. IPC is an organization that set standards of practice for printed circuit boards, called the Institue of Printed Circuits. A via is an electrical connection that joins different layers, in this case it is top to bottom. Pad was used in poor reference as that is usually associated with surface mount components and patterns. I should have used the word "land" which means the same thing but with through hole parts. Annular ring is the copper area surrounding a via or land to ensure proper solder wetting and sufficient copper to prevent issue with hole offset during the drilling process.
So when it comes to looking at the schematics, I look at them based on what I am familiar with, a net name is one physical connection to a trace or set of traces that connect to component leads or lands. I have been creating layouts for designs for over 30 years. I barely ever came across tape on velum but once or twice and that was for military projects. When the schematic is not tied into the actual layout using a CAD system, things may not be what they seem. FB to me indicated a common net connection and not just a reference where it may go too. I am flawed in character, so I make mistakes like everyone else. I learned form this. I appreciate those who can point that out or explain where I went wrong with my understanding when it comes to the Mesa designs.
Depth/Resonance. I added that to my Stiletto... simple and so effective. I never understood why Mesa didn't add this to their amps.
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