-
http://www.musikding.de/index.php/cat/c138_Sheet-metal-enclosures.html
-
http://www.angelfire.com/electronic/funwithtubes/Amp-Phase.html
-
http://paillard.claude.free.fr
-
http://en.wikipedia.org/wiki/Valve_audio_amplifier_-_technical
-
http://www.diyforums.org/MAX/MAXoverview.php
-
http://www.audiotub.fr/site1.htm
-
http://www.bonavolta.ch/hobby/en/audio/audioel.htm#Amps
Lot of good articles on tube amps (meanly distortion oriented)
http://www.angelfire.com/electronic/funwithtubes/index.html
-
http://members.chello.nl/~m.heijligers/DAChtml/dactop.htm
-
http://www.triodeel.com/schindex.htm