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MHD4

Information - Help 
ID = 2911
       
Country:
Great Britain (UK)
Brand: MO Valve Co. Ltd.; GB
Tube type:  Double Diode-Triode   Audio Frequency 
Identical to MHD4

Base British-7-Pin, old (M7A) (Codex=Nb)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Parallel, (AC/DC)
Literature Taschenbuch zum Röhren-Codex 1948/49   
  mhd4_circuits_examples~~1.png
  MHD4: Gecovalve technical bull. june 1933
Xavier Lemercinier
 
mhd4001.jpg
MHD4: Sammlung GJ
Anonymous 544 Collector

 
523_7.png
MHD4: Telefunken Werkstattbuch
Wolfgang Bauer

 
mhd4_spec.png
MHD4: Marconi Advertisement
Anonymous 15 Collector


Usage in Models 8= 1933 ; 2= 1934? ; 20= 1934 ; 2= 1935? ; 21= 1935 ; 14= 1936 ; 7= 1937 ; 1= 1938? ; 3= 1938 ; 3= 1939 ; 1= 1946??

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):82


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