Well Jim, looks like i'll throw a spanner in the works.....
The Walgreen
This tower is just about the smallest i've seen, that doesn't use ferrite. Walgreen, because it's a pill bottle and that's a popular pharmacist chain here in the USA
It comes from thoughts when considering coil to coil inductance and that strange phenomena, whereby a CFL might extinguish if it's right next to a tower.
Of 250 turns, the wire is from a small DC motor. 2 turn bell wire primary of 2x tower diameter.
It does all that my larger towers have done and yet seems more efficient in some ways too on 3.7V. I mean, plasma ?! and fully lighting an energy saver bulb ?!
Transistor is the C3198, the whole circuit coming directly from the Wensleydale tower for an exact comparison - take a look

YouTube - The Walgreen - wireless exciter
.Jonny.
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