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MHL4

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ID = 2775
       
Country:
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  Triode, vacuum   Audio Frequency 
  Ca. 1925 up to 1945 rare.
Identical to MHL4 = CV1038 = VT91_GPO
Similar Tubes
Normally replaceable-slightly different:
  244V ; 41MHL ; 4HLAC ; S415N_Fotos ; TE244
Other class quality (otherwise equal):
  CV3547

Base Europe 5-Pin (O5A, B5) (Codex=F)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Parallel, (AC/DC)
Literature - - Manufacturers Literature   
Taschenbuch zum Röhren-Codex 1948/49   
The Saga of Marconi Osram Valve
 
gecovalvemhl4.jpg
MHL4: Gecovalve UK
Jose Vigil

 
7_70.png
MHL4: Telefunken Werkstattbuch
Wolfgang Bauer

 
m.hl4_osram.png
MHL4: osram wireless guide 1931
Giuseppe Antonio Tusini


Usage in Models 2= 1929 ; 1= 1930 ; 1= 1931? ; 18= 1931 ; 15= 1932 ; 1= 1933? ; 5= 1933 ; 1= 1934 ; 1= 1935 ; 2= 1937 ; 1= 1945?

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):48


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