31. The dual-gate MOSFET has a tetrode configuration, where both gates control the current in the device. 32. Beam tetrodes have remained in use until quite recently in power applications such as audio amplifiers and radio transmitters. 33. Beam tetrode audio power output valves were introduced in 1937, and quickly replaced conventional pentodes in this application. 34. This was solved by the Neutrodyne circuit, and later the development of the tetrode and pentode around 1930. 35. An important part of the neutralization of a tetrode or pentode is the design of the screen grid circuit. 36. Until recently, little has been written in English of the enigmatic figure of Willem Tetrode / Guglielmo Fiammingo. 37. He is known for the development of the Sackur Tetrode equation, which he developed independently of Hugo Tetrode. 38. He is known for the development of the Sackur Tetrode equation, which he developed independently of Hugo Tetrode . 39. His and Tetrode 's names are also combined to name the Sackur Tetrode constant derived using the equation. 40. His and Tetrode's names are also combined to name the Sackur Tetrode constant derived using the equation.
