evn171 telefunken rhre wwi year 191617 direct heated triodedisk anode nos
evn171 telefunken rhre wwi year 191617 direct heated triodedisk anode nos
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Very Rare 1916 AKG / TELEFUNKEN / Siemens type K1 / EVN-171 tube valve
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EVN171 Telefunken Röhre WWI year 1916/17 direct heated triode,disk anode NOS
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