SonicTrance
Member of the Trade: Custom Amp Builder
I have my lowest setting resistors connected to the poles of the switch, from ground side of Ra. The other R's, on B+ side of Ra, are then connected in series to that pole resistor. Can't remember why I did it like that but it doesn't matter. You can also just solder a wire to the poles, from either side of Ra, and then your different "addit Ra" from the other side of Ra to the different positions on the switch.