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ID = 30803
Tube type:  SPECIAL TUBE, other or unknown   SHF/EHF (>3 GHz) 
Identical to N821B/38B1
Similar Tubes
Other shape (e.g. bulb type):

Base SPECIAL TUBEBASE in general 2 Top contacts.
Description Bolometer for RF power Measurements.
Mainy used at mm wavelengths and less where other methods are difficult. 
Information source -- Collector info (Sammler)   
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N821B/38B1: Private collection
Emilio Ciardiello


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