Help to identify valve tube

Jacob Roschy Ernst Erb Martin Renz Bernhard Nagel 
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Forum » Valves / tubes - Semiconductors » Very rare valves or unknown (not in RMorg) » Help to identify valve tube
Jose Maria Maseda
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16.Nov.20 04:02

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   Please, help to identify this tube. Thanks


Otmar Jung
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16.Nov.20 06:40

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It is this tube: Ste1300/01/05