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H4D

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

Base British-7-Pin, old (M7A) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC
Description

Early version of this tube had an unshielded bulb and screw type top cap.

 
Information source History of the British Radio Valve to 1940   p. 146 & 179
Babani, International Radio Tube Encyclopaedia   p. 108 & 109
Taschenbuch zum Röhren-Codex 1948/49

ferranti_h4d_circuit.png
H4D: Ferranti Valves, List Wb. 560
Achim Dassow

ferranti_h4d_socket.png H4D: Ferranti Valves List Wb. 560
Achim Dassow


Just Qvigstad
ferranti_h4d_data.png
H4D: Ferranti Valves List Wb. 560
Achim Dassow

More ...
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

Collection of

 
h4d.jpg

H4D
 

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