Unbekannte Röhre unknown tube /valve
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©
Tube Collection Udo
Radtke,
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Diameters top = 15 mm and lower part = 20 mm. Total hight = 75 mm. Plate connected to top. Grid is a coil, all turns are welded at a pin. Inside the grid is no filament, but a small metal tube. Total No. of wires leading from in- to outside = 3.
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