A pair of home-made Plasma Tube systems.

A copy of the Spectrotek Plasma Tube system.
IMG 20170906 161653 (resized)  This researcher built a nice copy of the Spectrotek Plasma Tube system.  He built two systems, each operating with a different carrier frequency. This unit uses a 1.8 MHz carrier wave. IMG 20170907 112154 (resized)  Plasma tube operating at 1.8 MHz. IMG 20170910 162450 (resized)  This unit uses a 3.1 MHz carrier wave.