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ID = 18313
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Wunderlich Tube   Detector 
Identical to 29_Wunderlich
Similar Tubes
Other characteristic (electr. data):
  90_Wunderlich ; KR20 ; WunderlichA_6pin
Other base and data slightly different:

Base 6-Pin-Base U6A, old, USA (Codex=K)
Filament Vf 2.5 Volts / If 1 Ampere / Indirect / Parallel, (AC/DC)
Description A triode with two equal grids and a single plate. Used as a full wave detector (am) with additional LF-amplification. Sylvania type 29 blue: The type 29 was Sylvania's equivalent to the Arcturus Wunderlich A. Apparently, Sylvania bought a few Arcturus Wunderlich A's and rebranded them Sylvania. 
Text in other languages (may differ)
29_Wunderlich: W.H.
Wolfgang Holtmann


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