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ID = 28787
Brand: Siemens (& Halske, -Schuckert Werke SSW, Electrogeräte); Berlin, München
Tube type:  Screen-grid Tetrode   Audio Frequency 
  <1925 very rare. ***
Identical to SSII = 97
First year 1917 Saga of the Vacuum Tube, Tyne page 253, 254
Predecessor Tubes SSI   SSI_G5K  
Successor Tubes SSIII  

Base EU-Telephone 5-pin (G5K)
Was used by Military and/or Government
Filament Vf 2.2 Volts / If 0.25 Ampere / Direct / Battery =

Bei nur 10,5 V an Schirmgitter und Anode 30fache Verstärkung.
Das Schirmgitter -zwischen Steuergitter und Anode- soll die unerwünschte Anodenrückwirkung reduzieren. Es wurde damals Schutznetz genannt.

Information source Saga of the Vacuum Tube, Tyne   

Just Qvigstad
SSII: Riepka, Die Röhre, 1926
Anonymous 15 Collector

Collection of



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