Editing Nuvistor (section)

==Dissection of a Nuvistor triode tube ==
{| class="wikitable"
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!Parts of a small Nuvistor triode 
!Pictures
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|7586 Nuvistor triode. Two lugs (one large and one small) adjacent to pins 2 and 4 locate the valve in its socket, which is shown alongside.
|[[File:7586 Nuvistor triode tube.jpg|150px]]
|-
|7586 Nuvistor triode. Twelve pins protrude through the ceramic base, some of which are long and form the connections to the heater, cathode, grid and anode electrodes. These short pins support the internal structure, along with the long ones.
|[[File:7586 Nuvistor triode tube - bottom view.jpg|150px]]
|-
|The metal envelope has been removed. View of the tube base, [[anode]] or plate and support pins.
|[[File:7586 Nuvistor triode tube - internal top view.jpg|150px]]
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|View of the tube base, [[anode]] or plate and support pins. Note that there are no mica spacers used to support and separate internal structures, as in normal valves. 
|[[File:7586 Nuvistor triode tube- internal bottom view.jpg|150px]]
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|The [[anode]] has been removed. The vertically oriented, mesh wire electrode is the [[control grid]].
|[[File:7586 Nuvistor triode tube - the grid.jpg|150px]]
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|The [[control grid]] has been removed. The vertically oriented electrode is the [[cathode]]. The indirectly heated cathode surrounds the heater. The electron emitting portion of the cathode is the white-colored [[Hot cathode|oxide coating]], typically barium oxide or strontium oxide.
|[[File:7586 Nuvistor triode tube - the cathode.jpg|150px]]
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|The cathode has been removed. The heater is [[tungsten]] [[wire]] coated with a refractory dielectric material of high thermal conductivity.
|[[File:7586 Nuvistor triode tube - the heater.jpg|150px]]
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|}