I dunno about that one. I don't know what RGBs is or what devices use it. A VGA plug uses two synchs: Horizontal and Vertical. A VGA-to-RGBHV plug is just a way of expanding the VGA connector into five RCA plugs for each of those five parts (three color guns and the two synchs). It doesn't have any electronics, just the right RCA wires connected to the right VGA pins. Would RGBs be the same thing but just use only one of the synch plugs?