Dual Condensers?

It depends on the primary supply voltage, the individual coil, capacitor and the rpm (interrupt frequency) what the voltage spike will actually be. I have measured 300+ on a scope.

If you are worried about capacitor quality, try one of those brass things Tubman makes. They seem to match most coils found on model A's.

Thanks Pete. You got the numbers, you're the man! :)

I always worry about product Quality...it's fused into my DNA.
I'm not familiar with Tubman. They make caps?
 
He reproduces the type made by Mallory for it's aftermarket ignition systems. Some call them the trash can type due to it's size and shape. This is what they look like.
https://www.jalopyjournal.com/forum/threads/vintage-look-brass-trash-can-condensers.1037842/

They are pretty large for a model A application. The Vertex Scintilla magneto condensers are another well made cap that folks sometimes use but all of these are expensive. Napa Echlin still manufactures fairly decent condensers but I don't know how much longer that will last after they were bought out by Standard Motor Parts. I always buy two or three to make sure I get at least one good one.
 
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