Al,
Thanks for those kind remarks.
I have also just updated the article, I found a way to eliminate the H linearity error. It simply required adjustment of the S correction capacitor (yoke coupling capacitor) to allow for the longer scan period.
(some multi-standard CRT monitors switch in different values with mosfets) The scan linearity now on 405 vs 625 line mode is practically identical. It also meant the width control/yoke circuit inductance requires no adjustment between modes which frees up a set of relay contacts to switch in the S correction cap.
Updated article :
http://worldphaco.com/uploads/Autode...e_monitor..pdf