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ID = 28800
Brand: Triotron (tubes) = Brand of Schrack, Austria
Tube type:  Triode, vacuum 
  Ca. 1925 up to 1945 rare.
Identical to SV7
First year 1926 ?? Saga of the Vacuumtube, Tyne page 462

Base Europe 4-Pin (A, 4A, B4, since 1914)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.5 Ampere / Direct / Battery =

Printed on the glass: Schrack, SV7, 4 Volt-0,5A, 70 V.

Dimensions (WHD)
incl. pins / tip
41 x 98 x 35 mm / 1.61 x 3.86 x 1.38 inch
SV7: own collection
Peter den Boer

SV7: own collection
Peter den Boer


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