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ID = 1773
Brand: Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH
Tube type:  Vacuum Pentode   Power/Output 
Identical to RENS1384 = L4138D = APP4130 = P441N = E463 = NP43
First Source (s)
1933 : -- Schematic
Successor Tubes 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

Telefunken - Version of the E463
Most likely never produced by Telefunken, however bought elsewhere and sold under own name and brand.

Simultaneously with the directly heated E443H Philips offered the equally sized indirectly heated E463 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 Taschenbuch zum Röhren-Codex 1948/49   
RENS1384: R.O.
Rudolf Osterkamp

RENS1384: Telefunken Werkstattbuch
Wolfgang Bauer

RENS1384: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

from Just Qvigstad

Usage in Models 2= 1933 ; 1= 1934 ; 1= 1936

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):4

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