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ID = 741
Brand: Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH
Tube type:  Vacuum Pentode   Power/Output 
Identical to RES174d = BF43 = PB4 = DU415 = DX3 = Pentodion-Fourvolt = RO4243 = P420 = B443_4pin = W443_4pin = J43 = PP415_4pin
Similar Tubes
Normally replaceable-slightly different:
  L415D ; L43 ; LLD415
Other base:
  LL415 ; ME4_362 ; RES174 ; W443
Other base and data slightly different:
First year 1931 Tube leaflet collection E.Erb Analysis by original leaflets
First Source (s)
Aug.1931 : Funk Bastler 1931 Heft 33

Base Europe 4-Pin B4 + side contact (Codex=Eoo)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.15 Ampere / Direct / Parallel, (AC/DC defined voltage)

RES174d - siehe auch irrtümliche RES174.

Tube prices 5 Tube prices (visible for members only)
Information source Taschenbuch zum Röhren-Codex 1948/49   
RES174d: Sammlung I.M.
Anonymous 557 Collector

RES174d: Telefunken Werkstattbuch
Wolfgang Bauer

RES174d: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

from Just Qvigstad

Usage in Models 2= 1929 ; 1= 1931? ; 3= 1931 ; 1= 1932?? ; 34= 1933 ; 2= 1935

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):43

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