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0W4/350

 
    
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The 0W4/350 is a full wave rectifier. The filament is an inverted V. The spots on the envelope suggest a mercury vapour device.
Thanks to Bob Hopkins for sending the image.
The classic envelope is  mm in diameter, and excluding the B4 base pins is  mm tall.
Reference: Observation.

 

Updated April 27, 2013.
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