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TH4A

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ID = 8680
       
Country:
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Triode-Heptode   Frequency converter 
Identical to TH4A
Similar Tubes
Normally replaceable-slightly different:
  TH4B_Tungsram
First year Aug.1937 The Wireless World, London (WW, 79) Show report

Base British-7-Pin, old (M7A) (Codex=Nao) Top contact with a cap
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1.5 Ampere / Indirect / Parallel, (AC/DC)
Literature Taschenbuch zum Röhren-Codex 1948/49   
 
tungsram_th4a.jpg
TH4A: Used valve from my collection.
Gil Silva

 
s_401_g.gif
TH4A: W.Sprick: Austausch-Röhren-Lexikon 1947
Günther Stabe

 

Usage in Models 1= 1937? ; 12= 1937 ; 27= 1938

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):40


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