When I converted the 41 to 12 V, I went to an external coil. The kit included a condenser.
Car runs fine, but I had ignition noise through the 12v radio, so I installed a noise filter and it stopped. 8 months later it's come back, so I'm guessing the filter has died young.
Before I start to monkey with it, it occurred to me it might be the condenser. I don't hear great things about the ones that come in the kits. What say you?
Note I'm down under so I can't just pop into a NAPA, and were in lockdown
so I can only buy online.