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ID = 11546
Great Britain (UK)
Brand: Ferranti, GB
Tube type:  Double Diode-Pentode   Power/Output 
Identical to PT4D = AC2/PenDD
Similar Tubes
Heater different:
First Source (s)
1934 : History of the British Radio Valve to 1940 p. 146 & 189

Base British-7-Pin, old (M7A) (Codex=Nh) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 2 Ampere / Indirect

Pa <8W, 2.5W output into 6500 ohms.

Information source Babani, International Radio Tube Encyclopaedia   p. 130 & 131
Wireless World (The), London (WW, 79)   Data Nov 1934
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49

PT4D: Ferranti Valves, List Wb. 560
Achim Dassow

s_386_g_3.gif PT4D: W.Sprick: Austausch-Röhren-Lexikon 1947
Günther Stabe † 19.8.20

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Just Qvigstad
PT4D: Ferranti Valves List Wb. 560
Achim Dassow

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Usage in Models 1= 1934 ; 3= 1935 ; 6= 1936 ; 3= 1937

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):13

Collection of



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