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ID = 2535
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
Identical to MS4
Similar Tubes
Normally replaceable-slightly different:
  AS494 ; CV1164 ; DW6 ; E442 ; I4091 ; S4150 ; TE42
Other base:
Successor Tubes MS4B_Catkin  

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Er) Top contact screw type.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Parallel, (AC/DC)
Information source Taschenbuch zum Röhren-Codex 1948/49   
MS4: Own collection
Georges Van Campenhout

MS4: rtt
Michael Schlör

MS4: osram wireless guide 1931
Giuseppe Antonio Tusini

from Just Qvigstad

Usage in Models 1= 1929 ; 2= 1930? ; 9= 1930 ; 1= 1931?? ; 15= 1931 ; 1= 1932? ; 12= 1932 ; 4= 1945?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):45

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