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ID = 60457
United States of America (USA)
Brand: DeForest-Tubes
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Transmitting Triode, air cooled   Universal 
  Ca. 1925 up to 1945 very rare. ***
Identical to D402_deForest = 402 = UV202 = C302
Predecessor Tubes DM  

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Was used by Transmittertube (Radio)
Filament Vf 7.5 Volts / If 2.35 Ampere / Direct / Battery =

5 watt transmitting tube fitted with "Isolantite" base (a type of ceramic). First made 1928

Dimensions (WHD)
incl. pins / tip
55 x 135 x mm / 2.17 x 5.31 x inch
Information source 70 Years of Radiotubes and V.   
- - Manufacturers Literature   

uv4_11~~1.png D402_deForest
Peter den Boer

Just Qvigstad
D402_deForest: KoBi
Konrad Birkner † 12.08.2014


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