One of the best overall technical reviews of what Ed used on the 78 VH tour was from a guy named Robin L on the Metro Amp forum years ago like around 2009/2010. I recommend finding that account and reading it in it's entirety. We broke all of this ground in the EVH section of the Metro amp forum almost 20 years ago. Too many guys on YouTube wailing through stock Germino, Metro, Metroamp kit, Suhr, and Friedman 68 plexi's showing the amp was mostly stock with no extra gain stages period.
https://forum.metropoulos.net/viewtopic.php?t=45834
Whoever the guy was... some thought it was Rudy Leiren but it seems he was not, he did appear to have some insight about the tour possibly another roadie, it was interesting nevertheless.
I can only say I've tried every iteration of Ed's setup, from Friedman's to Suhr descriptions and the Robin L slaving setups and they all work to get Ed's core tone using everything that is publicly known in his pedal board effect, no magical dust except what and how he used it plus his playing.
Ed was getting Ed's core tones from stock Marshall Superleads after 12301 was lost coming back from Japan and his tone was still awesome. If you watch the videos from the Selland arena Niagara Falls in the September of 78 all the amps were regular Superleads and Musicman HD130's and 65's. I currently own a 67 Bandmaster and Musicman HD130 and I guarantee you Ed's was not using them as a main amp but they are on stage and turned on. There are already lengthy threads on this RT forum about the Selland arena show if you want to look them up but here are videos of live shows that show what amps he was using at these shows.
Neither of these shows had 12301 plexi, it's all Superleads NO 12301 or plexi's. I'm not sure when he got 12301 and the wooden headbox plexi which was a Superbass(acccording to Dave Friedman and Robin L) back but he did get them back.
Niagara Falls Convention Center, NY September 8, 1978
Selland Arena September 22, 1978