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1T4, Tube 1T4; Röhre 1T4 ID429, Vacuum Pentode | Radiomuseum.org
Radiotechnique - Wikipedia
One Tube AM Radio
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1 X DF91 / 1T4 TUBE. NOS. RCB102
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Kurzwellen Audion von Klaus Zimmermann
CQ CQ CQ de W0VLZ: 1T4 / 3V4 Regenerative Portable - continued
1T4, Tube 1T4; Röhre 1T4 ID429, Vacuum Pentode | Radiomuseum.org
1942 One Tube “Beginner's Special” Receiver | OneTubeRadio.com
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CQ CQ CQ de W0VLZ: 1T4 / 3V4 Regenerative Portable - continued
