Lot of good articles on tube amps (meanly distortion oriented)
http://www.angelfire.com/electronic/funwithtubes/index.html
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http://www.dd-wrt.com/wiki/index.php/LaFonera_Hardware_Serial-Cable-Port
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http://members.chello.nl/~m.heijligers/DAChtml/dactop.htm
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http://users.tkk.fi/~jwagner/electr/minidisc-spdif
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http://web.jfet.org/inGrid
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http://instruct1.cit.cornell.edu/cour...ts/s2006/bcr6/final_report/index.html
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http://www.triodeel.com/schindex.htm
Small headphone amp with 12AE6A
http://www.ibiblio.org/tkan/audio/millett.html