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http://members.chello.nl/~m.heijligers/DAChtml/dactop.htm
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http://en.wikipedia.org/wiki/Valve_audio_amplifier_-_technical
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http://www.triodeel.com/schindex.htm
Small headphone amp with 12AE6A
http://www.ibiblio.org/tkan/audio/millett.html
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http://www.subatomicglue.com/mintymic/#protoboard
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http://www.angelfire.com/electronic/funwithtubes/Amp-Phase.html
Lot of good articles on tube amps (meanly distortion oriented)
http://www.angelfire.com/electronic/funwithtubes/index.html
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http://www.troelsgravesen.dk/Diy_Loudspeaker_Projects.htm
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http://www.musikding.de/index.php/cat/c138_Sheet-metal-enclosures.html
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http://www.georgegardner.info/electronics/class-d-avr.html