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VHT4

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ID = 9358
       
Country:
Great Britain (UK)
Brand: Ferranti, GB
Tube type:  Pentagrid-Converter (Heptode)   Pentagrid (old)   Controlling (mu) 
Identical to VHT4
Similar Tubes
Heater different:
  VHTS
First year 22.Nov.1935 Wireless World (The), London (WW, 79)
First Source (s)
11.Aug.1933 : Wireless World (The), London (WW, 79) p107
1933 : History of the British Radio Valve to 1940 p. 146 & 198

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

This is the first British Pentagrid Frequency Changer.
Not P8A (Roehren-Codex) base but B7.

 
Information source Babani, International Radio Tube Encyclopaedia   p. 154& 155
Wireless World (The), London (WW, 79)   nov 1934
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49

ferranti_vht4_circuit.png
VHT4: Ferranti Valves, List Wb. 560
Achim Dassow

ferranti_vht4_socket.png VHT4: Ferranti Valves List Wb. 560
Achim Dassow


Just Qvigstad
ferranti_vht4_data.png
VHT4: Ferranti Valves List Wb. 560
Achim Dassow

More ...
Usage in Models 3= 1933 ; 4= 1934 ; 1= 1935? ; 3= 1935 ; 6= 1936 ; 5= 1937

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):22

Collection of

 
ferranti_vht4.jpg

 

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