The use of a single wire to make dual coils is called a sleeper, would be the same with two wires for a parallel build.
In my opinion its the only way to do dual coils on some rebuildables due to positive post limitations for wire size.
I'm nearly 100% sure there is an advantage in conductivity due to the setup being far simpler and having less extra wire in the build.
If I can manage to make enough 32 on 32 Clapton wire I want to do a parallel dual vertical coil on my Stillare. I'm just not quite there yet.
Maurice
In my opinion its the only way to do dual coils on some rebuildables due to positive post limitations for wire size.
I'm nearly 100% sure there is an advantage in conductivity due to the setup being far simpler and having less extra wire in the build.
If I can manage to make enough 32 on 32 Clapton wire I want to do a parallel dual vertical coil on my Stillare. I'm just not quite there yet.
Maurice