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ID = 25472
United States of America (USA)
Brand: RCA (RCA Victor Co. Inc.); New York (NY)
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Double Diode   Detector 
  Late but very rare. ***
Identical to 1638 = EB34 = VR54 = CV1054 = 10E/11400 = ARDD5 = VT202_GPO
Similar Tubes
Other base:
First Source (s)
1941 : Tube Lore (I)
Production stop 1945

Base Octal (Int.Octal, IO) K8A, USA 1935
Filament Vf 6.3 Volts / If 0.2 Ampere / Indirect / Specified voltage AND current AC/DC
Description RCA production of British types, furnished to British government via U.S. Signal Corps (by L. Sibley) 
1638: RCA 1638
John Hupse † 28.9.20

More ...
1638: Manufacturer's Literature
Emilio Ciardiello

1638: Babani 1951-1954
Patrice Zeissloff

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