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ID = 13666
Brand: Kremenezky, Johann (Sator); Wien,(Röhrenhersteller)
Tube type:  Triode, vacuum   Universal 
Identical to A20

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Filament Vf 1 Volts / If 0.09 Ampere / Direct / Battery =
Description Sockeldurchmesser 22 mm; Durchmesser des Glaskolbens nur 15 mm! 
Dimensions (WHD)
incl. pins / tip
22 x 69 x 22 mm / 0.87 x 2.72 x 0.87 inch
Information source Funk Bastler   1927, Heft 1, p.13 u.14

sockel_4stift_6.png A20: g.h.
Gerhard Heigl

Just Qvigstad
A20: g.h.
Gerhard Heigl

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