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ID = 49619
United States of America (USA)
Brand: DeForest-Tubes
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Half-Wave Vacuum Rectifier   Power-supply 
  Ca. 1925 up to 1945 rare.
Identical to D416B
Similar Tubes
Normally replaceable-slightly different:
Predecessor Tubes DR  

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Was used by Radio/TV-reception etc.
Filament Vf 7.5 Volts / If 1.25 Ampere / Direct / Specified voltage AC/DC

Tube fitted with "Isolantite" base (a type of ceramic)

Dimensions (WHD)
incl. pins / tip
55 x 135 x mm / 2.17 x 5.31 x inch
Information source - - Manufacturers Literature   1927
70 Years of Radiotubes and V.   Page 166
D416B: RMG
Robert Gillespie

D416B: own collection
Peter den Boer

D416B: own collection
Peter den Boer

from Just Qvigstad

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