ZV7T : how to make distortion analyzer?

Had no time and no room to build projects since 2007, retired now I have a lot in my boxes... The IM Distortion Analyser, a pair F Seven monobloc balanced, just got the aluminium sheets to cut, a pair of mono blocs F5X Turbo, a pair of speakers with Audio Nirvana 6.5" in Triple resonator enclosures, a Wyn Palmer Phono Stage V2 to finish, and a pair of UGS preamplifiers with supplies to finish... swap my Martin Logan Aerius i in 230VAC, so with my A75 ... just need a 'few' more weeks.... if my wife does agree on my schedule! 😎

PS: I missed a Time mark generator on hold... http://www.davidbridgen.com/calbox.htm