When [Thomas Scherrer] wanted to test some tubes, he made the same kind of assumption. While tubes can develop wacky failure modes, the normal difference between a working tube and a failing tube ...

But how to know whether your find is any good? [Rob’s Fixit Shop] took a look at a tube tester, once a fairly ubiquitous item, but now a rare sight. To look at it’s a box with an array of tube ...

Judy Carr is wheeled out of the hospital holding her daughter Elizabeth Carr. More than eight years had passed since America’s first attempt at a test tube baby. Amid controversy and limitations ...