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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):

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

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)
Literature Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
DA: W.Sprick: Austausch-Röhren-Lexikon 1947
Günther Stabe


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