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L4138D

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ID = 3044
       
Country:
Germany
Brand: Valvo Radioröhrenfabrik GmbH; Hamburg
Tube type:  Vacuum Pentode   Power/Output 
Identical to L4138D = APP4130 = RENS1384 = E463 = P441N
First Source (s)
Mar.1933 : Philips Bulletin
Predecessor Tubes L4150D  
Successor Tubes 1935   AL2  

Base Europe 6-Pin B6 (1933) (Codex=Ld)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1.3 Ampere / Indirect / Parallel, (AC/DC)
Description

Simultaneously with the directly heated E443H Philips offered the equally sized indirectly heated E463 (=L4138D) with the advantage of less hum and easier obtaining of grid bias. Its spreading was far below the E443H, it was not present on the German market.

 
Text in other languages (may differ)
Literature Taschenbuch zum Röhren-Codex 1948/49   
 
l4138a.jpg
L4138D: My collection
Paolo De Pasqual

 
11_4.png
L4138D: Telefunken Werkstattbuch
Wolfgang Bauer

 
l4138d_spec.png
L4138D: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector


Usage in Models 1= 1933 ; 1= 1934 ; 1= 1935? ; 2= 1935

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):5


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