usefull articles and websites...let's collect them

[lineup]

Millett Hybrid Maxed - A vacuum tube and solid state hybrid headphone amplifier

http://www.datasheetcatalog.com/

Absolutely!
I use this alternative link several times every day
http://www.datasheetarchive.com/

http://www.pmillett.com/

Agree, ashok.
Pete Millett is a great DIY Audio man.
Only Tubes or Tubes-Solid State Hybrides - his amplifiers / circuits are good

There is plenty of webstuff from the hand & mind of PMillett. Pete Millett.
Millett Amplifier - google.com

See for example this Hifi HeadPhone Amplifier Project.
Documentation and IMAGES in World Spitzen Class:

The Millett Hybrid Maxed
>>> a vacuum tube and solid state hybrid headphone amplifier <<<

audio regards lineup

 

[Cloth Ears]

http://www.coilgun.info/mark2/inductorsim.htm
http://www.colomar.com/Shavano/inductor_info.html
http://www.geocities.com/mghsxo/
http://www.zero-distortion.com/start.htm
http://www.dself.dsl.pipex.com/index.htm
http://www.ethanwiner.com/ and especially http://www.ethanwiner.com/acoustics.html
and an oldie, but a goldie - http://www.thevintageknob.org/
and for when searching for that 'other' album - http://www.allmusic.com/