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ID = 12979
Brand: Triotron (tubes) = Brand of Schrack, Austria
Developer: Triotron (tubes) = Brand of Schrack, Austria 
Tube type:  Screen-grid Tetrode   Audio Frequency   Controlling (mu) 
  Ca. 1925 up to 1945 very rare. ***
Identical to S415N
Similar Tubes
Normally replaceable-slightly different:
  E415 ; H4125D ; NVS4 ; RENS1214

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Fc)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect

Siehe gleich bezeichnete Detektor-Triode von Grammont (Fotos) Frankreich.

Information source Babani, International Radio Tube Encyclopaedia   p. 140 & 141
- - Manufacturers Literature   1935
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49

9_32.png S415N: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad
S415N: Triotron Röhrenkatalog von 1942
Wolfgang Bauer

More ...
Usage in Models 1= 1930??

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

Collection of



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