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ID = 49066
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Tube type:  Triode, vacuum 
Identical to CV1000 = NR55 = AR7 = VR109A
Similar Tubes
Heater different:

Base British-7-Pin, old (M7A) Top contact with a cap.
Filament Vf 13 Volts / If 0.15 Ampere / Indirect
Description Same specs as CV1109, but lower heater current. 
Information source -- Original-techn. papers.   

nr5.png CV1000: Manufacturer's Literature
Emilio Ciardiello

Just Qvigstad
CV1000: Manufacturer's Literature
Emilio Ciardiello

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