Class A amplifiers are widely considered the purest sounding designs. They are also inefficent and expensive to buy commerically.
They are however relatively simple to build with some electronics experience. This lens provides some diy resources for anyone wanting to have a go at building their own bipolar class A amplifier.
Useful Links
get the good oil from the horses mouth
- The Class A Site
- A site primarily dedicated to the John Linsley Hood Class-A amplifier design, originally published in 1969 and later updated in 1996.
Many of JLH's original articles are available here as well as updated designs. - Graham Maynards update of the JLH design
- Graham published a number of interesting articles in Wireless World last year (2005)describing his amplifier. He is interested to hear of people's experiences from listening to this design.
- DIY audio
- A very active forum of audio experimenters, this link is to the solid state section. Worth a look. Try the search features to help find what you are interested in amongst the "noise".
- The Death of Zen Class A amplifier
- This is a very popular design from Rod Elliot whose esp web site contains tons of valuable information for any diy audio nut. Rod makes excellent PC boards for many of his projects, including the DOZ.
- Class A @ Wikipedia
- Always worth having a look at the information in this collective repository.
DIY audio books from Amazon
Audio Power Amplifier Design Handbook
Doug's book is the bible for the analysis and reduction of distortion. Highly recommended
Amazon Price: (as of 12/27/2009) 
Valve and Transistor Audio Amplifiers
This and JLH's other books explore a wide range of amplifier designs including several of his classics.
Amazon Price: $57.56 (as of 12/27/2009)
Audio Electronics, Second Edition
Amazon Price: $64.56 (as of 12/27/2009)
Art of Linear Electronics, Second Edition
Amazon Price: (as of 12/27/2009)
Amazon Recommends
The Audiophile's Project Sourcebook: 80 High-Performance Audio Electronics Projects
Amazon Price: $19.77 (as of 12/27/2009)
Electronic Audio Circuits Sourcebook Volume 1
Amazon Price: $20.99 (as of 12/27/2009)
Digital Audio Workstation
Amazon Price: $30.62 (as of 12/27/2009)
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