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ID = 49378
Brand: Standard Radiofabrik A.B.; Ulvsunda
Developer: Siemens; D (S.& Halske / S. Electrogeräte) 
Tube type:  Triode, vacuum   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to 3S21 = Da

Base EU-Telephone 5-pin (G5K)
Was used by Telephony
Filament Vf 5.8 Volts / If 1.1 Ampere / Direct / Parallel, (AC/DC defined voltage)

Manufacturer: ABSR A.B. Standard Radiofabrik Ulvsunda Sweden

Text in other languages (may differ)
Information source Babani, International Radio Tube Encyclopaedia   Page 6
- - Manufacturers Literature   Sept 1950
3S21: Fin Stewart
Fin Stewart

3S21: Babani 1949-1951
Patrice Zeissloff

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