[TCML] vacuum tube coil

[Clive Hansen]

Hello,
   Does anyone know what the distinct advantage of a vacuum tube tesla
coil? I have seen a lot of hype regarding these and cannot spot the
advantage. I am thinking about building one, however, I just want to
know why they are better (or worse) than a traditional coil design
with a spark gap. I found this schematic which is the one I am
considering. http://research.microsoft.com/~swinder/sparks/tes2circuit.jpg

-Clive