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http://diyaudioprojects.com/Tubes/12AX7-12AU7-Tube-Preamp
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http://tubedevices.com/alek/pwl/lampy_j_e.htm
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http://cgi.ebay.com/2-5K-SE-AUDIO-OUT...QQrdZ1QQcmdZViewItem#ebayphotohosting
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http://web.mac.com/scress1958/iWeb/St...e%27s%20Tube%20Trials/EL34%20Amp.html
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http://www.ladyada.net/rant/2009/01/tubes-t00bs-and-tubez
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http://euphoniaaudio.netfirms.com/ea/...Csid=d71714968f5b41bcb0f43b9dbf366b46
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http://paillard.claude.free.fr
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http://www.elettronicanovarria.it/home.html
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http://www.techtubevalves.com/about_us/film_reels.php
Lot of good articles on tube amps (meanly distortion oriented)
http://www.angelfire.com/electronic/funwithtubes/index.html