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

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

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)
Information source Babani, International Radio Tube Encyclopaedia   p. 116 & 117
Universal Vade-Mecum, Electron Valves and Semiconductor Devices   Section 207, p. 407
Taschenbuch zum Röhren-Codex 1948/49

11_4.png L4138D: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad
L4138D: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

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

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

Collection of



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