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ID = 44795
Brand: Metrum AG; Wallisellen
Tube type:  Transmitting Triode, air cooled 
Identical to SO22

Filament Direct
Description Kleinsenderöhre mit Oxydkatode; Anodenverlustleistung: 15W. 
Information source Schweizer Elektronenröhren 1917-2003, Willi E.   Seite 205
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