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https://www.instructables.com/id/ILC1-18L-Clock
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https://github.com/audiyofan/jx12-project
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http://www.tubecad.com/2006/08/blog0075.htm
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http://audiyofan.org/forum/viewtopic.php?f=4&t=7378
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http://tubedevices.com/alek/pwl/lampy_j_e.htm
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http://www.elektrohobby.de/Bauelemente/Transformatoren/?cur=1
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http://hackaday.com/2010/03/09/tube-clock-database
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http://www.ladyada.net/rant/2009/01/tubes-t00bs-and-tubez
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http://diyaudioprojects.com/Tubes/12AX7-12AU7-Tube-Preamp
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http://www.techtubevalves.com/about_us/film_reels.php