Thermionic - Valve

By adding a "grid" between the two, engineers found they could control this flow with tiny voltage changes, effectively turning the valve into a powerful or a switch . A Legacy of Innovation

The Warm Glow of the Past: Why Thermionic Valves Still Matter thermionic valve

Invented by in 1904, the first valve (the diode) was inspired by the "Edison Effect" observed in early light bulbs. This invention paved the way for: Finding meaning in the Thermionic valve - UCL Blogs By adding a "grid" between the two, engineers

At its simplest, a thermionic valve is a device that controls the flow of electric current in a vacuum. It works through : a filament or "cathode" is heated until it’s hot enough to literally boil electrons off its surface. These electrons then fly through the vacuum toward a positively charged plate (the anode). It works through : a filament or "cathode"