One classification of thermionic vacuum tubes is by the number of active electrodes.
CATHODE LIGHT TUBE GENERATOR
Gas-filled tubes are similar devices, but containing a gas, typically at low pressure, which exploit phenomena related to electric discharge in gases, usually without a heater.Ĭlassifications Radio station signal generator with vacuum tubes Not all electronic circuit valves / electron tubes are vacuum tubes. Thermionic tubes are still employed in some applications, such as the magnetron used in microwave ovens, certain high-frequency amplifiers, as well as high end audio amplifiers, which many audio enthusiasts prefer for their "warmer" tube sound, and amplifiers for electric musical instruments such as guitars (for desired effects, such as "overdriving" them to achieve a certain sound or tone). However, the cathode-ray tube (CRT) remained the basis for television monitors and oscilloscopes until the early 21st century. Beginning in the mid-1960s, thermionic tubes were being replaced by the transistor. In the 1940s, the invention of semiconductor devices made it possible to produce solid-state devices, which are smaller, more efficient, reliable, durable, safer, cooler, and more economical than thermionic tubes. Although some applications had used earlier technologies such as the spark gap transmitter for radio or mechanical computers for computing, it was the invention of the thermionic vacuum tube that made these technologies widespread and practical, and created the discipline of electronics. They were crucial to the development of radio, television, radar, sound recording and reproduction, long-distance telephone networks, and analog and early digital computers. These devices became a key component of electronic circuits for the first half of the twentieth century. Adding one or more control grids within the tube allows the current between the cathode and anode to be controlled by the voltage on the grids. Electrons can flow in only one direction through the device-from the cathode to the anode. It contains only a heated electron-emitting cathode and an anode. Fleming valve), was invented in 1904 by John Ambrose Fleming. The simplest vacuum tube, the diode (i.e.
CATHODE LIGHT TUBE SERIES
Not shown are the impedances ( resistors or inductors) that would be included in series with the C and B voltage sources. Hot tubes in an audio power amplifier, emitting their distinctive red-orange glow Illustration representing a primitive triode vacuum tube and the polarities of the typical DC operating potentials. In both types, the electrons are accelerated from the cathode to the anode by the electric field in the tube. Non-thermionic types such as a vacuum phototube, however, achieve electron emission through the photoelectric effect, and are used for such purposes as the detection of light intensities. The type known as a thermionic tube or thermionic valve utilizes thermionic emission of electrons from a hot cathode for fundamental electronic functions such as signal amplification and current rectification. Later thermionic vacuum tubes, mostly miniature style, some with top cap connections for higher voltagesĪ vacuum tube, electron tube, valve (British usage), or tube (North America), is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied. For the transport system, see Pneumatic tube.
CATHODE LIGHT TUBE FREE
For experiments in an evacuated pipe, see Free fall. Our 27 years of experience demands that we focus on color consistency, energy efficiency, the most minimal dimensions available and the most trouble-free, long-lived light source that has ever been conceived.This article is about the electronic device. Slight differences in the hue of the light source are amplified manifold when the illumination is viewed as reflected light upon the surfaces of an indirect cove. Please browse through our website where you will find a variety of phenomenally clever luminaire designs which perform beautifully and as always, are very contractor-friendly.Ĭove lighting is most demanding application for any lamp source. Our concept of the low wattage, ultra-long life cold cathode luminaire has garnered us a 2011 Progress Report award for our model HFCLS-Slim. Our cold cathode luminaires have no equal in the superiority of the lighting effect, color consistency, evenness of illumination or dimming compatibility.Īll of our luminaires are small in profile, modular and are powered by integral high-performance, electronic ballasts. Mainly, but not exclusively, used for indirect cove lighting, our innovative product line utilizes the unique end-to-end illumination feature of time-proven cold cathode lamp technology. We design and manufacture the highest quality cold cathode lamps and luminaires in the world.
0 kommentar(er)
