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ID = 38633
Tube type:  TR-switch 
Identical to 1B25
Similar Tubes
Other characteristic (electr. data):
First Source (s)
20.Aug.1943 : - - Manufacturers Literature
03.Nov.1944 : Electron Tube Registration List 391
Predecessor Tubes 1960  

Was used by Radar

Sealed gas filled spark gap, intended as UHF TR switch for use in coaxial transmission lines. Spark-gap spacing can be adjusted by means of a threaded tie-rod between two base flexing fins.
160V max breakdown, 30A max.

Information source -- Original-techn. papers.   
Tube Lore (I)   
1B25: Private collection
Emilio Ciardiello

1B25: Manufacturer's Literature
Emilio Ciardiello

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