My V1C torroid will easily produce 60kv. With 800 turns aiding bifilar, 8 turn primary and 200 turn secondary. As you can see, it doesn't follow the standard turns ratio of a transformer. Only the seconary and primary do, while the bifilar boosts it much greater. Both bifilar and secondary are 24ga and primary is half in flat copper strip. I don't have a diode yet for rectification. Since the potential is too high. In fact, I will either have to power it with 5v or less or or remove another 100 Turns off the secondary winding in order to lower the output before I Damage the transformer. Bifilar in aiding fashion is the way to go if you want high potentials with only a Moddest number of windings. Something no single wrap coil could ever achieve With the same number of windings.