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W306_Marathon

Information - Help 
ID = 20359
       
Country:
Netherlands
Brand: Marathon (tubes), Radio-Marathon, N.V. Rave; Amsterdam, Eindhoven
Developer: RCA (RCA Victor Co. Inc.); New York (NY) 
Tube type:  Triode, vacuum   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to W306_Marathon
Similar Tubes
Normally replaceable-slightly different:
  F704 ; T730
Other base:
  F704_UX4 ; UX250
Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 7.5 Volts / If 1.25 Ampere / Direct / Specified voltage AC/DC
Description

There is an error in tha datasheet of this tube where is stated that it has a B5 base. This tube (other brochures) has a B4 base and the tube is heated direct.

 
Information source - - Manufacturers Literature   1935
Universal Vade-Mecum, Electron Valves and Semiconductor Devices   Section 138, p. 186
Röhrencodex , Röhren-Taschenbuch 1950 23000 Röhren
Röhren-Vademecum; P.H. Brans; Antwerpen
w306_marathon_so.png W306_Marathon: rtt
Anonymous 10 Collector

Just Qvigstad 		w306data.png
W306_Marathon: own collection
Peter den Boer
 
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Data Compliance More Information