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Vacuum tubes, or thermionic valves, are arrangements of electrodes in a vacuum within an insulating, temperature-resistant envelope.Although the envelope was classically glass, power tubes often use ceramic and metal.Before starting, I must warn you that acquiring vintage gear can be really risky.You can end up buying something that is not what you expected or even something that is damaged or modded beyond repair.The resulting negatively-charged cloud of electrons is called a space charge.

From 1984 to 1992 the model number was first, then the date code, then the serial number.However, tubes are still used in several specialized applications such as guitar amplifiers (also called a valve amp outside the U.S.) and high power RF transmitters, as a display device in television sets and in microwave ovens.Other configurations are also possible including the Pentode, a tube with 5 active elements providing an additional amplification factor.There are a large number of tube varieties and uses.

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