Injecting 2nd order THD into the audio stream to bring "warmth"

[ogs]

The essence of it all comes when Paul McGowan describes the character of FET's vs other transistors or tubes. Integrated op-amps is generally a no-no due to reliance of aggressive internal feedback. Most modern circuit design use op-amps, however, because of simplicity. The late Charley Hansen of Ayre fought this practice all his audio-life. Most 'old' audio designers know this, (like John Curl) but the knowledge is slowly disappearing. This only relates to analog circuits by the way. Digital is different (but has it's own set of sensitivities).