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

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 ...

Chicago, Jan. 16, 2026 (GLOBE NEWSWIRE) -- The global vacuum blood collection tube market was valued at 3.24 billion in 2024 and is expected to reach US$ 4.40 billion by 2033, growing at a CAGR of ...

Older table-top AC-DC radios used a classic line-up of tubes. Think 12SA7, 12SK7,12SQ7, 35Z5GT, and 50L6GT. As I grew into my teens, I got interested in how these radios worked and soon discovered ...

Before transistors or microchips, the earliest computers relied on vacuum tubes — glass bulbs that glowed like small light bulbs and acted as electronic switches. Each tube could represent a one or ...

Given appropriate models for vacuum tubes, circuit simulators such as SPICE make analysis based on such nonlinear models a tractable effort. The Langmuir, Leach, and Koren models are discussed for the ...

Gas flames had been electrically conductive since about the middle of the nineteenth century, and early wireless researchers recognized that the existence of radio waves altered this conductivity. De ...

Linear, small-signal AC models can be useful in the analysis and design of vacuum-tube-based circuits. Under large-signal conditions, nonlinear models are typically required. Almost 120 years ago, ...