Penta Laboratories, a manufacturer in Newbury Park, Calif., makes vacuum tubes for radio transmitters and other purposes.

Careful design and reused parts helped Arizona AM station KNUV keep its transmitter relocation project on budget.

Second generation écoute vacuum tube wireless noise cancelling headphones improve comfort and sound in a slightly modified design. What if headphones were not trying to imitate a hi-fi system but ...

China is developing a next-generation maglev system designed to reach 1,000 km/h by combining magnetic levitation with low vacuum tube travel. This video breaks down how it works, why it goes far ...

Although we do often see projects that take antiques and replace some or all of their components with modern equipment, we can also sympathize with the view that (when possible and practical) certain ...

If 2026 is the year you’re vowing to travel more yet pack less, we’re totally on the same page. Lugging around an overstuffed ...

Discover how to get your hands on the best vacuum cleaner for your needs with our expert advice and Best Buy recommendations. Our rigorous, independent lab tests have found the worst vacuum cleaners ...

AT the last meeting of the Chemical Society, Sir William Ramsay, Prof. Collie, and Mr. Patterson described some experiments which they regard as proving the transmutation of other elements into helium ...

Abstract: The vacuum tube train can break through the difficulties of wheel-rail resistance, air resistance and noise of traditional wheel-rail railways. It can reach ultra-high speed of more than 600 ...