[Bret L]

Ferstler has never done any DIY projects. Nor is there any evidence
that he could.

David Rich is another matter. In the old "Audio Critic" he would g
through commercial designs and essentially critique their component
engineering, always suggesting a better IC or other part for each
stage. Why he didn't simply design one "de novo" and publish a PCB
layout for us proles is my question, and one he never deigned to
answer.