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The 426 is a battery triode.
The valve is silvered over most of the top of the envelope and the inside of the anode is not visible.
The balloon envelope is 44 mm in diameter, and excluding the UX5 base pins is 99 mm tall.
Reference: Observation.


Updated April 14, 2013.
shape:balloon construction:pinch type:triode age:1920.1930 base:ux5 pins:5 pin:
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