This wonderful vacuum tube chess set, by maker Paul Fryer, actually has electricity running inside the board so that the tubes can draw power and glow as you move them from square to square. It is ...

The Dynaco CDV-1 CD player is a glowing endorsement of a technology so old that it predates even the Volkswagen Beetle. Before the mighty transistor, vacuum tubes brought sound into the American home.

Some of the tubes, though, cooperated in spades, quickly taking on a very unhealthy glow. One tube, a 6BZ7 dual triode, really put on a show, with something getting so hot inside the tube as to ...

But really, you’ve got to check this out. Making vacuum tubes with all the proper equipment — glassblower’s lathe, various kinds of oxy-fuel torches, all the right hand tools — is hard enough.

The vacuum tubes are already pre-mounted, ... The tubes glow with a warm orange light that is a welcome respite from LEDs. Solis also included a Magic Eye VU meter with the SO-8000.

Nothing can travel faster than the speed of light in a vacuum. However, in other mediums, particles can potentially move faster than light. ... Whenever that happens, a blue or violet glow occurs.

The image above shows the small blue jet of the thruster framed in the white-blue porthole of a vacuum chamber where it is being tested at NASA’s Jet Propulsion Laboratory in Pasadena, California.