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ID = 28788
Brand: Siemens; D (S.& Halske / S. Electrogeräte)
Tube type:  Screen-grid Tetrode   Audio Frequency 
  <1925 very rare. ***
Identical to SSIII = 114
First year 1917 Saga of the Vacuum Tube, Tyne page 253, 254

Filament Vf 3.2 Volts / If 0.55 Ampere / Direct / Battery =
Description 100fache 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   
SSIII: Eigenes Bild
Anonymous 971 Collector

SSIII: Riepka, Die Röhre, 1926
Anonymous 15 Collector

Collection of a member from D

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