GENERAL KNOWLEDGE

Detailed explanation-1: -In which decade were the first successful diode and triode vacuum tubes invented? Explanation: In 1904, John Ambrose Fleming invented the first practical electron tube called the ‘Fleming Valve’, which is a diode rectifier.

Detailed explanation-2: -1904: British engineer John Ambrose Fleming invents and patents the thermionic valve, the first vacuum tube.

Detailed explanation-3: -It was invented in 1905, and in January 1906, De Forest filed a patent for diode vacuum tube detector. The Vacuum Tube of John Ambrose Fleming. Sir John Ambrose Fleming (1849–1945) was an English electrical engineer and physicist, known primarily for inventing in 1904 the first vacuum tube.

Detailed explanation-4: -On October 20, 1906, Lee de Forest announced his invention, a triode called audion, at a meeting. Despite having invented the first triode, which served as an amplifying device that changed the face of the broadcasting industry, de Forest was plagued by many failures.