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The serial number is 3693. The name Cossor has been written in ink. The other information does not fit any known valve.
The filament draws 200 mA at 2 Volts.
The balloon envelope is 44 mm in diameter and, excluding the B4 base pins, is 90 mm tall.
Reference: Observation.

 

Updated June 16, 2020.
shape:balloon construction:pinch type:triode base:b4 pins:4 pin:
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