JR sent me the original Bob Cordell article "Build a High Performance THD Analyzer" from Audio Magazine Volume 65, July, August, September 1981.
Edit June 8, 2016. A clean copy along with PC Board layouts is located here: https://www.proaudiodesignforum.com/for ... f=12&t=805
Before scanning it I checked to see if it was available online and stumbled upon Bob Cordell's site: https://www.cordellaudio.com/
Here is the link to the THD Analyzer: https://www.cordellaudio.com/instrument ... alyzer.pdf
Cordell: "Build a High Performance THD Analyzer"
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