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.

Blue isn’t just the wrong color for a vacuum tube; as everybody who’s worked on tube gear knows, a blue glow means that the tube is gassy, and therefore BAD. Report comment Reply ...

For a little more on how the tubes worked, check out [Al Williams]’ article. Thanks to [Adrian] for the tip. Posted in Misc Hacks Tagged 6E5 , 6U5 , cathode ray , indicator , magic eye , solid state ...

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.