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AL4S

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ID = 51613
       
Country:
Europe
Brand: Common type Europe tube/semicond.
Tube type:  Vacuum Pentode   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to AL4S
Similar Tubes
Multiple differences or of other kind:
  AL4 ; E463
First Source (s)
Sep.1937 : - - Manufacturers Literature
Base Europe 6-Pin B6 (Hx B) 1933
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 2 Ampere / Indirect / Specified voltage AC/DC
Description

This is a common AL4 on an European B6 6-Pin base. Designed to replace older output tubes like the E463 in older sets with the purpose to enhance performance. The cathode resister should be 150 Ohms, and in the wire to the grid a resistor of 400 Ohm should be added to prevent oscillation. The tube was made by Thermion in the Netherlands. See data taken fram Thermion nieuws of Sept-Oct 1937.

 
11_3~~3.png AL4S: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad 		al4sdata.png
AL4S: own collection
Peter den Boer
 
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