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H4D

Information - Help 
ID = 14246
       
Country:
Great Britain (UK)
Brand: Ferranti, GB
Tube type:  Double Diode-Triode 
Identical to H4D
Similar Tubes
Normally replaceable-slightly different:
  AC/HLDD

Base British-7-Pin, old (M7A)
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   
 
h4d.jpg
H4D: own collection
John Koster

 

Usage in Models 5= 1933 ; 3= 1934 ; 3= 1936 ; 2= 1937

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):13


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