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==Tube packages==
[[File:6Z4 var.jpg|thumb|right|Metal-cased tubes with octal bases]]
[[File:GS-9B.JPG|thumb|right|Triode tube type GS-9B; designed for use at radio frequencies up to 2000 MHz and rated for 300 watts anode power dissipation.<ref>[https://web.archive.org/web/20210225190032/http://www.gstube.com/data/1450/ GS-9B Oscillator Ultra-High Frequency Triode] Archived 25 Feb. 2021</ref> The finned heat sink provides conduction of heat from anode to air stream.]]
Most modern tubes have glass envelopes, but metal, fused quartz ([[silica]]) and [[ceramic]] have also been used. A first version of the 6L6 used a metal envelope sealed with glass beads, while a glass disk fused to the metal was used in later versions. Metal and ceramic are used almost exclusively for power tubes above 2 kW dissipation. The [[nuvistor]] was a modern receiving tube using a very small metal and ceramic package.
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