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ID = 3665
Brand: Tungsram; Budapest (see also British T.)
Tube type:  Triode-Hexode   Frequency converter 
  Late but very rare. ***
Identical to 21TH8 = TX21 = 21TH8G
Similar Tubes
Heater different:
Other base:
First Source (s)
Apr.1937 : Histoire de la lampe de radio
Mar.1937 : L'Histoire Singulière du Tube Radio; G. Duperray 2009
Successor Tubes 1939   ECH3  

Base Octal (Int.Octal, IO) K8A, USA 1935 (Codex=Ua)
Was used by Radio/TV-reception etc.
Filament Vf 21 Volts / If 0.2 Ampere / Indirect / Specified current AC/DC ~ = (Series working)
Information source Histoire de la lampe de radio   
Taschenbuch zum Röhren-Codex 1948/49   

21TH8: Internet
Miguel Angel Trujillo-Rodriguez

oc24_1~~12.png 21TH8: RTT 1974 (Franzis) 13. Auflage
Martin Renz

Just Qvigstad
Usage in Models 1= 1937 ; 3= 1938 ; 2= 1939 ; 1= 1941

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):7

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