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ID = 28785
Brand: Triotron (tubes) = Brand of Schrack, Austria
Tube type:  Triode, vacuum   Detector 
  Ca. 1925 up to 1945 very rare. ***
Identical to SS_Triotron
Similar Tubes
Other base:
First year Oct.1924 Der Radio-Amateur Wien, 1924, H.25
First Source (s)
1926 : Saga of the Vacuum Tube, Tyne page 463

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 2.3 Volts / If 0.07 Ampere / Direct / Battery =

Later this type had a filament voltage of 3 and a filament current of 0.06 Amp.

Tyne writes on page 463:: „Triotron tubes were made by Radiowerk E. Schrack, of Vienna, beginning about 1926.“ But the fact is that we ahve evidences for 1924, like for instance the model TE9.

Dimensions (WHD)
incl. pins / tip
x 85 x 44 mm / x 3.35 x 1.73 inch
Weight 60 g / 2.12 oz
Information source - - Manufacturers Literature   Undated catalogue c. 1925

3_b4~~13.png SS_Triotron: own collection
Peter den Boer

Just Qvigstad
SS_Triotron: own collection
Peter den Boer

More ...
Usage in Models 1= 1924

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1


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