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938OS

 
    
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The 938OS is a mystery triode. Clearly a battery low power device with four filament strands passing through the grid.
Thanks to Bob Hopkins for sending the image.
The balloon envelope is  mm in diameter, and excluding the B4 base pins is  mm tall.
Reference: Observation.

 

Pin Connections
B4
1
2
3
4
a
g1
f
f

 

Updated April 27, 2013.
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