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ID = 50706
Brand: Northern Electric Co. Ltd.; Canada
Tube type:  Triode, vacuum   Universal 
Identical to R221-D = UV201A
Similar Tubes
Other base:
  R221-DX ; UX201A
Successor Tubes R221-DX  

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Was used by Radio/TV-reception etc.
Filament Vf 5 Volts / If 0.25 Ampere / Direct / Battery =
R221-D: By courtesy of Knud Jensen.
Konrad Birkner † 12.08.2014

R221-D: Fin Stewart
Fin Stewart

R221-D: KoBi
Konrad Birkner † 12.08.2014

from Just Qvigstad

Usage in Models 1= 1925

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

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