[rotorwrench]

The Mallory design coils used in the early V8 era were a good bit different than the can type coils used in the model A/B and 8BA eras. They used a formula to calculate for capacitor rating for each different design of coil. The Mallory designs also required a ballast resistor to control the current to the coil. It functioned better on a lower current than the average can type coil. This also affected the capacitor rating needed.