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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:
  TCH24 ; TH4B_Tungsram
First year Aug.1937 Wireless World (The), 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 / Specified voltage AC/DC
Information source History of the British Radio Valve to 1940   p. 150 & 199
Babani, International Radio Tube Encyclopaedia   p. 146 & 147
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49

s_401_g.gif TH4A: W.Sprick: Austausch-Röhren-Lexikon 1947
Günther Stabe † 19.8.20


Just Qvigstad
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

Collection of

 
tungsram_th4a.jpg

TH4A
 

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