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ID = 7444
Great Britain (UK)
Brand: Cossor, A.C.; London
Tube type:  High-vacuum Rectifier   Power-supply 
Identical to 225DU = 10E/525 = ZA5611 = CV1454
First Source (s)
1937 : History of the British Radio Valve to 1940 p.170

Base British-7-Pin, old (M7A) (Codex=Nw)
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.5 Ampere / Direct

Two separate 0.5A filaments for use in a voltage doubler circuit.

<750V piv and <20mA mean current.

Information source Taschenbuch zum Röhren-Codex 1948/49   

507.png 225DU: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad
Usage in Models 1= 1939?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

Collection of



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