OA 91, Tube OA91; Röhre OA 91 ID34052, Solid-State-Diode
OA91 Fiches technique(PDF) - List of Unclassifed Manufacturers
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OA91 Germanium Diode NOS | eBay
Peak Electronic Design Ltd 💙🇪🇺 on Twitter: "@KangaSales The OA91 is actually my favourite germanium diode (built my very first crystal set with one). I must have one somewhere here at Peaky