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SSII

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ID = 28787
       
Country:
Germany
Brand: Siemens; D (S.& Halske / S. Electrogeräte)
Tube type:  Screen-grid Tetrode   Audio Frequency 
  <1925 very rare. ***
Identical to SSII = 97
First year 1917 Saga of the Vacuumtube, Tyne page 253, 254
Predecessor Tubes SSI  

Filament Vf 2.2 Volts / If 0.25 Ampere / Direct / Battery =
Description 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. 
Literature Saga of the Vacuumtube, Tyne   
 
ssii_spec.png
SSII: Riepka, Die Röhre, 1926
Anonymous 15 Collector


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