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7D3

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ID = 9531
       
Country:
Great Britain (UK)
Brand:
Tube type:  Vacuum Pentode   Power/Output 
Identical to 7D3
First Source (s)
22.Nov.1935 : Wireless World (The), London (WW, 79)

Base British-7-Pin, old (M7A) (Codex=N)
Was used by Radio/TV-reception etc.
Filament Vf 40 Volts / If 0.2 Ampere / Indirect / Specified current AC/DC ~ = (Series working)
Information source History of the British Radio Valve to 1940   p. 144 & 189
Babani, International Radio Tube Encyclopaedia   p. 16 & 17
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49

551_2.png 7D3: Telefunken Werkstattbuch
Wolfgang Bauer

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Just Qvigstad
7d3_brimar_radio_valves_1936_p1_data1.png
7D3: Brimar Radio Valves 1936
Adrian Riesen

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Usage in Models 6= 1934 ; 1= 1935 ; 1= 1939

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):8

Collection of

 
7d3.jpg

7D3
 

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