This video suggests one easy and economical approach to a power supply for large electrodeless plasma tubes.  Such devices operate from high-frequency, high-voltage electricity that must be obtained from a suitable circuit containing a switchmode inverter and a high-turns-ratio step-up transformer.  (Alternatively, CW Tesla coils are very effective).  The supplies in small commercial plasma globes cannot drive many of the larger custom and artistic displays, necessitating a DIY approach to the power supply...or spending a lot of money.  I describe the use of a small encapsulated commercially-available transformer (the HVT-01 from Images Scientific, <a rel="nofollow" class="external free" href="http://www.imagesco.com/high-voltage/transformers.html">http://www.imagesco.com/high-voltage/transformers.html</a>), being driven by a DC-powered inverter, the PVM-12 sold by Information Unlimited (www.amazing1.com/), to provide about 60W to a variety of plasma loads.  The PVM-12's circuit is based on the SG3525A PWM chip switching a couple mosfets in push-pull mode, and the schematic may be found here: <a rel="nofollow" class="external free" href="http://www.capturedlightning.org/hot-streamer/temp/Old2002Files/2002-02/PMPglobe.pdf">http://www.capturedlightning.org/hot-streamer/temp/Old2002Files/2002-02/PMPglobe.pdf</a>
<a rel="nofollow" class="external text" href="https://www.youtube.com/user/Thallium208">Carl Willis</a>
CC BY 3.0
<bdo lang="en" dir="ltr"><a href="//commons.wikimedia.org/wiki/Commons:YouTube_files" title="Commons:YouTube files">YouTube</a>: <a rel="nofollow" class="external text" href="https://www.youtube.com/watch?v=g5RSndK5Fto"><bdi lang="">Power supplies for decorative plasma displays</bdi></a> – View/save archived versions on <a rel="nofollow" class="external text" href="https://web.archive.org/web/*/https://www.youtube.com/watch?v=g5RSndK5Fto">archive.org</a> and <a rel="nofollow" class="external text" href="https://archive.today/https://www.youtube.com/watch?v=g5RSndK5Fto">archive.today</a></bdo>