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KD21

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ID = 29933
       
Country:
Great Britain (UK)
Brand: Ferranti, GB
Tube type:  Voltage Regulator, single 
Identical to KD21

Base Octal (Int.Octal, IO) K8A, USA 1935
Filament --/--
Description 75V 5-30mA 
Information source - - Manufacturers Literature   
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