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AL3

Information - Help 
ID = 3486
       
Country:
Netherlands
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Vacuum Pentode   Power/Output 
Identical to AL3 = TL3 = TAL3 = VAL3 = TL34 = UAL3
Similar Tubes
Heater different:
  AL4
Heater and shape different:
  EL3
Other base and data slightly different:
  PenA4
First year 1935 Tube leaflet collection E.Erb Analysis by original leaflets = 1936
First Source (s)
10.Mar.1935 : Histoire de la lampe de radio
Predecessor Tubes E443H  
Successor Tubes 1936   EL3   EL3N   AL4  

Base Europe side contact base P (P8A) (Codex=Sfo)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1.85 Ampere / Indirect / Parallel, (AC/DC)
Description

After high-gm output penthodes were launched in the UK as early as 1933, this new genre of tubes came to continental Europe in 1935, as the AL3 appeared by Philips, with a round (cylindrical) cathode and a gm of 9 compared to 2,5 mA/V of earlier types as a new standard in Europe which remained until the end.

As in 1936 Telefunken launched the almost identical AL4 with an improved profiled cathode, Philips, Tungsram and other companies then renamed their existing AL3 also into AL4 and continued producing it unchanged. The type AL3 was withdrawn and replaced by the AL4. [J.R. Jan. 5, 2017]

 
Text in other languages (may differ)
Literature Histoire de la lampe de radio   (adv.
Taschenbuch zum Röhren-Codex 1948/49   Design = Philips
  umgebungsschaltbild_al3.png
  AL3: Röhrenkartei Drenkelfort
Peter Hoddow
 
al3_038r.jpg
AL3
Jacob Roschy

 
38.png
AL3: Telefunken Werkstattbuch
Wolfgang Bauer

 
al3_spec.png
AL3: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector


Usage in Models 1= 1935?? ; 4= 1935? ; 20= 1935 ; 1= 1936?? ; 2= 1936? ; 17= 1936 ; 1= 1937? ; 22= 1937 ; 1= 1938? ; 11= 1938

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):80


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