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ID = 20359
Brand: Marathon (tubes), Radio-Marathon, N.V. Rave; Amsterdam, Eindhoven
Tube type:  Triode, vacuum   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to W306_Marathon
Similar Tubes
Normally replaceable-slightly different:
  F704 ; T730

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
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
W306_Marathon: rtt
Michael Schlör

W306_Marathon: own collection
Peter den Boer

from Just Qvigstad

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