The Class-A Amplifier Site
This site was last updated on 03 August 2014 (moved to ESP website)

The Class-A Amplifier Site



This site is primarily dedicated to the Class-A amplifier designed by John Linsley Hood, which was originally published in Wireless World in April 1969 (with a postscript in December 1970) and later updated in Electronics World in September 1996.  However, other Class-A design articles by Jean Hiraga, James Sugden, Stan Curtis and L Nelson-Jones have been added, along with some more JLH circuits. Schematics for other Class-A amplifiers and for three classic Class-B commercial amplifiers, the NAD3020, the Cyrus 1 and the Sugden A48-II, have been included for reference.



IndexLast Updated
The JLH Class-A Amplifier1 May 2004
Other JLH Amplifier Designs12 January 2002
Other Class-A Amplifiers19 July 2004
Classic Class-B Schematics17 August 2003
JLH Power Amp Schematics18 January 2007
The Published Articles of John Linsley Hood26 September 2009
ESP Main Index



This website was created by Geoff Moss. It is hosted by ESP (Note new address:


01/05/2001 Site created
04/07/2003 Site closed
17/08/2003 Site re-opened with new URL
04/04/2004 Indexing revised
18/01/2007 JLH Power Amp Schematics added
03/08/2014 Site relocated (again) to