Yeah, I know Dawk (Ritchie's old amp tech), so does Groundhog Ken. Dawk actually looked over the last Major I bought. He used to work for Macintosh and single handedly figured out the problems with the Major for Marshall, brilliant guy. He fixed all of Deep Purples amps from 1972 on, then did all the amp mods to Ritchie's Majors from about the end of MKIII and Rainbow on. He also did the scallop work on the necks of his Strats, modified the Fender wang bar setup so it would not go out of tune (even with a 1/4" diameter bar), and also invented a master tone control that was a big part of Ritchie's Rainbow Strat sound. He has a warehouse with about a half dozen of Ritchie's old modded Majors and cabs, and tons of broken guitar parts (courtesy of Ritchie over the years). I wonder what all that is worth.... I've got a picture he gave me of the amp (re-covered) that Ritchie famously blew up at the California Jam and tossed off stage. Not a thing broken other than a tube - built like tanks. He also did all of the work on Jon Lord's B3, Roger Glover's Ric bass mods, and also did work for Tony Iomi in the early 80's during the Dio Sabbath years.
There are some things taken out of context by the author of that article you posted. He (Dawk) knows the old GEC KT88's are rated to 800v. He used to bias them so hot Ritchie's Majors were pumping 280watts (they don't make tubes like that anymore). This amp was already on the ragged edge and RItchie liked the tone when it was pushed even more. Dawk spent a lot of time on planes flying around the world putting the smoke back in! They would last about a month. The rest of the story is accurate concerning the issues with UL design, HV spikes, and transformer problems. Dawk is in the process of writing a book concerning all the work he did for DP, Marshall, Ritchie, and others, with detailed schemo's and all. I am waiting in line.....
Jim