Vacuum tube | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-23

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Vacuum_tube


00:03:15 1 Classifications
00:05:58 2 Description
00:12:59 3 History and development
00:15:36 3.1 Diodes
00:18:15 3.2 Triodes
00:27:13 3.3 Tetrodes and pentodes
00:32:17 3.4 Multifunction and multisection tubes
00:37:18 3.5 Beam power tubes
00:40:15 3.6 Gas-filled tubes
00:41:18 3.7 Miniature tubes
00:43:19 3.8 Improvements in construction and performance
00:45:13 3.9 Indirectly heated cathodes
00:47:29 3.10 Use in electronic computers
00:49:58 3.10.1 Colossus
00:51:39 3.10.2 Whirlwind and "special-quality" tubes
00:54:11 4 Heat generation and cooling
00:57:18 5 Tube packages
00:59:46 6 Names
01:03:33 7 Special-purpose tubes
01:07:36 8 Powering the tube
01:07:45 8.1 Batteries
01:10:28 8.2 AC power
01:13:33 9 Reliability
01:19:39 9.1 Vacuum
01:23:48 9.2 Transmitting tubes
01:26:08 9.3 Receiving tubes
01:26:54 9.4 Failure modes
01:27:03 9.4.1 Catastrophic failures
01:29:43 9.4.2 Degenerative failures
01:32:31 9.4.3 Other failures
01:34:02 10 Testing
01:34:18 11 Other vacuum tube devices
01:35:38 11.1 Cathode ray tubes
01:37:41 11.2 Electron multipliers
01:41:16 12 Vacuum tubes in the 21st century
01:41:28 12.1 Niche applications
01:43:47 12.1.1 Audiophiles
01:44:46 12.2 Vacuum fluorescent display
01:46:37 12.3 Vacuum tubes using field electron emitters
01:48:02 13 Patents



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SUMMARY
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In electronics, a vacuum tube, an electron tube, or valve (British usage) or, colloquially, a 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.
The type known as a thermionic tube or thermionic valve uses the phenomenon of thermionic emission of electrons from a heated cathode and is used for a number of fundamental electronic functions such as signal amplification and current rectification.
Non-thermionic types, such as a vacuum phototube however, achieve electron emission through the photoelectric effect, and are used for such as the detection of light levels. In both types, the electrons are accelerated from the cathode to the anode by the electric field in the tube.
The simplest vacuum tube, the diode invented in 1904 by John Ambrose Fleming, contains only a heated electron-emitting cathode and an anode. Current can only flow in one direction through the device—from the cathode to the anode. 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 grid or grids. These devices became a key component of electronic circuits for the first half of the twentieth century. They were crucial to the development of radio, television, radar, sound recording and reproduction, long-distance telephone networks, and analogue and early digital computers. 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.In the 1940s the invention of semiconductor devices made it possible to produce solid-state devices, which are smaller, more efficient, reliable and durable, and cheaper than thermionic tubes. From the mid-1960s, thermionic tubes were then being replaced with the transistor. However, the cathode-ray tube (CRT) remained the basis for television monitors and oscilloscopes until the early 21st century. Thermionic tubes still have some applications, such as the magnetron used in microwave ovens, certain high-frequency amplifiers, and amplifiers that audio enthusiasts prefer for their tube sound.
Not all electronic circuit valves/electron tubes are vacuum tubes. Gas-filled tubes are similar devices, b ...