You can easily get carried away when trying to test things. For example, if you want to know if your car is working, you could measure the timing of the ignition and put the car on a dynamometer. Or ...

Believe it or not, every Radio Shack – hell, almost every drugstore – once had a tube tester sitting at the back, available for all to use. Pulling a bunch of tubes out of a malfunctioning radio or TV ...

There’s still a mystique around vacuum tubes long after they were rendered obsolete by solid state devices, and many continue to experiment with them. They can be bought new, but most of us still come ...

In August we ran a few photos of Steve Johnson’s excellent collection of radios. This month, we’re tuning in on his tube testers. All information courtesy of Steve’s website. Confidence Special First, ...

Marked: "DAYRAD Tube Checker / Mfd. by the Radio Products Co., Dayton, Ohio. / Licensed Under Weston Patent 1704566 Type B". Includes leather carrying strap. Tube tester designed for A.C. plug in ...

Why you can trust TechRadar We spend hours testing every product or service we review, so you can be sure you’re buying the best. Find out more about how we test. Few areas of hi-fi are as apt for ...

At one time or another, most purchasers, operators and maintainers of closed feedwater heaters ask themselves the following question: “At what wall loss percentage should tubes be plugged to avoid ...