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== Notable features == [[Image:Duodekar.JPG|thumb|right|The evacuation tip is in the center of the circular pin pattern.]] A distinguishing feature of most Compactrons is the placement of the [[evacuation tip]] on the bottom end, rather than the top end as was customary with "miniature" tubes, and a characteristic 3/4" diameter circle pin pattern. * Most Compactrons ranged in glass envelope diameter from 28 to 70 mm depending upon the internal configuration. Variations of the Compactron design were made by [[Sylvania Electric Products|Sylvania]] and by some Japanese firms.
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