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ID = 10154
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Tube type:  Vacuum Pentode   Universal 
Identical to MSP4
Similar Tubes
Normally replaceable-slightly different:
  AC/HP ; CV1341
Other base and data slightly different:

Base British-7-Pin, old (M7A) (Codex=Fc) Top contact with a cap.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Parallel, (AC/DC)
Description For use in the RF/IF stages and also as a detector and AF amplifier
In the 5 pin version the suppressor grid is not available separately but is tied to the cathode. 
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
MSP4: W.E.
Wolfgang Eckardt

MSP4: Telefunken Werkstattbuch
Wolfgang Bauer

MSP4: Marconi Advertisement
Anonymous 15 Collector

from Just Qvigstad

Usage in Models 1= 1933? ; 8= 1933 ; 6= 1934 ; 1= 1935 ; 3= 1936 ; 1= 1937? ; 1= 1938? ; 1= 1938

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):22

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