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Information - Help 
ID = 4221
Tube type:  Damper, booster, flyback diode 
Identical to 2CN3B
Similar Tubes
Normally replaceable-slightly different:

Base Octal (Int.Octal, IO) K8A, USA 1935 Top contact with a cap.
Filament Vf 1.8 Volts / If 0.9 Ampere / Half indirect
Information source Essential Characteristics, GE 1973   

3cn3_sockel~~1.png 2CN3B: Essential characteristics
Peter Hoddow

Just Qvigstad

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