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SP4B

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ID = 10269
       
Country:
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Vacuum Pentode   RF/IF-Stage   Controlling (mu) 
Identical to SP4B
First Source (s)
22.Nov.1935 : Wireless World (The), London (WW, 79)

Base British-7-Pin, old (M7A) (Codex=Nf) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.65 Ampere / Indirect
Description

Grid from top cap.

 
Information source History of the British Radio Valve to 1940   142 & 196
Babani, International Radio Tube Encyclopaedia   p. 142 & 143
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49

159_12.png SP4B: Telefunken Werkstattbuch
Wolfgang Bauer


Just Qvigstad
sp4b_techdat01.png
SP4B: Mullard Valves 1936
Peter Hoddow

Usage in Models 1= 1935?? ; 1= 1937? ; 2= 1937

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):4

Collection of

 
gb_mullard_sp4brhre_1.jpg

SP4B
 

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