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VX3091

 
    
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The VX3091 is a minute device. Under a magnifying glass one can see a double spiral but it is not clear if this is the grid or the filament. With four flying leads this is probably a sub-miniature triode.
The thin glass tube envelope is 4 mm in diameter, and excluding the flying leads is 27 mm tall.
Reference: Observation.

 

Updated January 14, 2013.
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