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ID = 6611
Great Britain (UK)
Brand: Ferranti, GB
Tube type:  Triode, vacuum   Audio Frequency 
Identical to DA = C30B
Similar Tubes
Normally replaceable-slightly different:
Other characteristic (electr. data):
First Source (s)
1935 : History of the British Radio Valve to 1940 p. 178

Base British-7-Pin, old (M7A) (Codex=Nw)
Was used by Radio/TV-reception etc.
Filament Vf 13 Volts / If 0.2 Ampere / Indirect / Specified current AC/DC ~ = (Series working)

In the Röhren-Codex it is falsely stated that it is a double-diode.

Typical:- Va 200; Ia 3.7mA; Vg -2.6; Ra 20,000; gm 2.2mA/V
The Mullard HL13C is similar but may need a bias change to about -3.5 volts (Mullard Service data 1951)

Text in other languages (may differ)
Information source History of the British Radio Valve to 1940   p. 146 & 178
- - Manufacturers Literature   
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49

s_415_g_4.gif DA: W.Sprick: Austausch-Röhren-Lexikon 1947
Günther Stabe † 19.8.20

Just Qvigstad

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