28-08-2019, 06:41 PM
Hi Tim, the resistor is 30 Ohms, it doesn't have to be wire wound as long as it is rated at 1 Watt or greater. You could leave it out completely and change the bulb from a 2.5V 0.2A to a 9v 0.2A or 0.3A as was used on early coil ignition chummys (e.g. my 1929 tourer).