Many of us have seen spectrum tubes in school. Those of you more serious about studying spectrum tubes should invest in a decent power supply. The Steiner Enterprises Spectrum Tube Carousel Power Supply has you covered. It lets you study discharge tubes in a safer fashion. It can hold up to 8 tubes.
The unit has a magnetic interlock system that prevents voltage application to the tube contacts unless the tube is properly positioned. It also has a polymer shell to protect the body of your tubes.