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ElectronTubeStore.com
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1 TUBE 1S5/DAF91/ZD17. M17 EUR 4,99 - PicClick FR
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1U5 (IU5) Diode-Pentode. A vacuum radio tube by Brimar #21074 | M-Ware
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1U5, Tube 1U5; Röhre 1U5 ID2816, Diode-Pentode | Radiomuseum.org
