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ID = 19060
Brand: Siemens; D (S.& Halske / S. Electrogeräte)
Tube type:  Space Charge Tetrode 
  <1925 very rare. ***
Identical to R_Siemens
Successor Tubes OR  

Base Telefunken 4 Pins + 1 Socket (Codex=Telefunken 5 ( 4 Stifte, i Buchse))
Filament Vf 4.3 Volts / If 2.1 Ampere / Direct / Parallel, (AC/DC)
Description Tungsten filament.
Tyne page 431: "S&H's earliest developments were based on the results attained with some special double-grid tubes which had been evolved during WW1. The triode V27 was the progenitor of the tubes developed for telephone use in the postwar era." ...

"In the line of tetrodes for repeater applications the R was the first type, designed for the new multiplex telegraphy system. The R-Type was soon superceded by the OR. Main difference is that the OR has a oxyde coated cathode." 
Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
48 x 210 x 48 mm / 1.89 x 8.27 x 1.89 inch
Weight 133 g / 4.69 oz
Tube prices 1 Tube prices (visible for members only)
Literature Saga of the Vacuum Tube, Tyne   
Radios von gestern, 2. Auflage   
R_Siemens: Eigenes Bild
Anonymous 971 Collector

R_Siemens: W.H.
Wolfgang Holtmann

R_Siemens: Riepka, Die Röhre, 1926
Anonymous 15 Collector

You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]