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ID = 83701
Tube type:  Triode, vacuum 
Identical to UY221
First Source (s)
Jun.1929 : Radio Retailing (Radio & Television R.)

Base UY-Base, 5 Pins (USA, April 1927)
Was used by Radio/TV-reception etc.
Filament Indirect

With renewable heating unit.

Text in other languages (may differ)

Just Qvigstad
UY221: Internet
Peter Kahlich

Collection of



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