![]() Since these sorts of "vacuum tubes" have functions other than electronic amplification and rectification they are described elsewhere. Phototubes and photomultipliers rely on electron flow through a vacuum, though in those cases electron emission from the cathode depends on energy from photons rather than thermionic emission. Tubes have different functions, such as cathode-ray tubes which create a beam of electrons for display purposes (such as the television picture tube) in addition to more specialized functions such as electron microscopy and electron beam lithography.
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