There is a great video from the Geek Group on YouTube that explains how this works extremely well. It will also give some good tips on how to ensure proper phasing. Check it out!
https://www.youtube.com/watch?v=KSlQjw9OPG4
> Date: Fri, 20 Feb 2015 08:26:17 -0600
> From: tdg8934@xxxxxxxxx
> To: tesla@xxxxxxxxxx
> Subject: [TCML] Dual identical FRANCE neon sign transformers (15000v 60mA each) in parallel
>
> I currently have a France NST at 15kv 60mA and built a nice jacobs ladder
> with it. Yesterday on eBay I found what looks to be identical model NST for
> a good price (no GFI). From what I have read about NST phasing, having
> identical NSTs don't require testing the HV outputs and I should be able to
> connect them up in parallel identically using the same sides. What a jacobs
> ladder at 120mA would be! Anyway I'm assuming that I should start building
> my tesla coil with 1 NST and when it works add the next NST in parallel and
> double the capacitors and change the tap on the primary. Does this sound
> like all I would need to do?
>
> Thanks - Tim
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