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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 ; HL4_Tungsram ; S415N_Fotos ; TE244
Other class quality (otherwise equal):
  CV3547
First year 1929 -- Original prospect or advert Marconipbhone 47
Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=F)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC
Information source - - Manufacturers Literature   1936-1937 catalogue
Taschenbuch zum Röhren-Codex 1948/49   
The Saga of Marconi Osram Valve
- - Manufacturers Literature
7_70.png MHL4: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad 		m.hl4_osram.png
MHL4: osram wireless guide 1931
Giuseppe Antonio Tusini
More ...
Usage in Models 2= 1929 ; 1= 1930? ; 1= 1930 ; 1= 1931? ; 18= 1931 ; 15= 1932 ; 6= 1933 ; 1= 1934? ; 2= 1934 ; 1= 1935 ; 3= 1936? ; 4= 1936 ; 2= 1937 ; 1= 1945? ; 1= 1946
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):59

Collection of

Jan Poortman (NL)
Christian ADAM (F)
Patrice Zeissloff (F)
Georges Van Campenhout † 28.4.22 (B)
Collection of a member from FIN
Jose Vigil (RA)
 
gecovalvemhl4.jpg

MHL4
 

Variants

MHL4 with dome bulb
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