Ordered Bigger Toroid

I am now ready to start on the primary and secondary coil construction. So I started to look around for a toroid. Checked out a few sites but in some cases I was being quoted more for p+p than for the toroid itself. The plans I am working too (component wise) show the completed Tesla coil with a 12" toroid and an upgraded version with an 18" toroid. The later looked so much better, so I decided it would have to be an 18" diameter toroid. I emailed Alan from Teslastuff.com and he told me than he no longer stocked the larger toroids but would check to see if he could get one. A few days later, he emailed to say he could get me one and quoted me a very reasonable price with delivery from the US.

The above pic shows an 18" X 4.5" fitted to a 4" secondary coil. These toroids are constructed from 2 spun pieces of aluminium welded together then de-seamed. I checked with Alan to make sure that this upgrade would not need an increase to the dimensions of the secondary coil. He informed me that if I were still going to build a 4" diameter secondary then the dimensions would be as quoted in the original plans and no change was needed for the larger 18" toroid. However, if I wanted to upgrade to a 6" secondary the windings would have to be longer. Here we go!

Guess what? Yes. Have decided to upgrade to a 6" diameter secondary.......