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http://www.angelfire.com/electronic/funwithtubes/Amp-Phase.html
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http://www.subatomicglue.com/mintymic/#protoboard
Small headphone amp with 12AE6A
http://www.ibiblio.org/tkan/audio/millett.html
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http://www.triodeel.com/schindex.htm
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http://en.wikipedia.org/wiki/Valve_audio_amplifier_-_technical
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http://members.chello.nl/~m.heijligers/DAChtml/dactop.htm