It would be interesting to find out how they sound as I looked into building a TRImodal and/or Load Invariant when the article first came out but couldn't get the pcbs at the time .
A mate of mine also modified one of his amps at the time with Self's modifications and wasn't impressed in the least.
From notes I've seen around Self designed an Amp with the object in mind of having lowest possible distortion and that the amps 'sound' took second place. Of course this is subjective and could start a mini war.
All this aside I then found Marshall Leach's 'Leach Amp' and
have built one .Best sounding amp I have heard in a while and a 'Proven' design originally published in the late 70's and improved over time till now. I personally liked the idea that ''ALL the BUGS'' have been weeded out and if you read the stories of what UNI students who have built the amp have put the amp through you may be impressed .Like the idea that you can bung a 2uf cap directly across the speaker terminals and the amp won't go nova .
John