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ID = 11457
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Vacuum Pentode   Power/Output 
Identical to Pen4VB
Similar Tubes
Normally replaceable-slightly different:
  7A3 ; A70C ; AC2/Pen ; N41 ; PT4 ; PenA4

Base British-7-Pin, old (M7A)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1.95 Ampere / Indirect / Specified voltage AC/DC

Unusually high slope = 10mA/V for the 1930s. Rk of 145 ohms needed for a bias of -5.8V with Va of 250 and Vs of 100V.

Information source History of the British Radio Valve to 1940   p. 150 & 190
Babani, International Radio Tube Encyclopaedia   p. 126 & 127
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49

pen4vb_so.png Pen4VB: telefunken werkstattbuch
Anonymous 10 Collector

Just Qvigstad
Usage in Models 1= 1931 ; 1= 1932? ; 3= 1935? ; 20= 1935 ; 9= 1936? ; 9= 1936

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

Collection of



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