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ID = 85054
Brand: Siemens (& Halske, -Schuckert Werke SSW, Electrogeräte); Berlin, München
Tube type:  Screen-grid Tetrode   Audio Frequency 
  <1925 very rare. ***
Identical to SSI_G5K
Similar Tubes
Other base:
First year 1917 Saga of the Vacuum Tube, Tyne page 253, 254
Predecessor Tubes SSI  
Successor Tubes 1917   SSII  

Base EU-Telephone 5-pin (G5K)
Was used by Military and/or Government
Filament Vf 2.5 Volts / If 0.38 Ampere / Direct / Battery =

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
SSI_G5K: Riepka, Die Röhre, 1926
Anonymous 15 Collector

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