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G442

Information - Help 
ID = 18380
       
Country:
Netherlands
Brand: Longlife, the Hague
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
  Ca. 1925 up to 1945 rare.
Identical to G442
Similar Tubes
Normally replaceable-slightly different:
  B442
Production stop Feb.1938

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Er) Top contact screw type.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.1 Ampere / Direct / Battery =
Description

The Röhren-Codex (Germany) lists this tube as Thermion brand, but actually it's Longlife.

Used for HF amplification.

 
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   1-2-1935
 
g442_pic.jpg
G442: Courtesy of Wieslaw BOGDANOWICZ
Anonymous 15 Collector

 
3_5~~3.png
G442: Telefunken Werkstattbuch
Wolfgang Bauer

 

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