I'm not sure if this qualifies as building or repair, but for some time now I've been working on a project to completely restore my VERY crusty 1959 Superlead from 1973. I'll be adding photos to this topic later but for now, just a quick introduction and rundown. I bought a rather sad looking Marshall Superlead a couple months back that still had the original filter capacitors in it. Or more properly, after scraping off an amazing amount of filth and grime and dust, I found old capacitors hiding underneath. The cabinet isn't in great shape and, now I know, had been recovered at some point. And then immediately sprayed in white enamel on top of that. I tried everything and nothing would take the paint off that wouldn't also wreck the tolex. So eventually I just stripped the cabinet. In doing so that's when I discovered clear evidence that it had been recovered once already . The gold trim line below the small Marshall logo was the wrong size and type and was just glued in on top of the original trim line, and original tolex was still under that trim line. There are damaged spots all around the edges of the cabinet that were patched with filler. It had some unusual plastic corner protectors on every corner, a type I've never seen before or since. The feet, corners, and handle had all been painted brown and I'll have to say that the spray paint work was well done. But all the gold piping and trim was only gold because it had been hand painted with a brush with gold paint. It probably looked pretty good after being freshly painted and put together...but when I got it, it just looked like a mess. I'll redo the cabinet myself, when I have time for it. I just decided that for my purposes I'd have Sourmash build me a new cabinet for it. I'm going to hold back on what I got for a later post. It's nice, I'll say that. Sourmash does GOOD work. Highly recommended! Judging by the amount of dust, dirt, and grease that was stuck hard to the chassis, I'd have to say that this amp must have spent the last 20 years in a garage and a very dusty one at that. Both the front and rear gold panels have lots of pitting corrosion on them. That takes a pretty abusive environment to do that. And most of the lettering and legends was worn/weathered off. That actually is what started my project and new venture to create and offer brand new replacement metal panels for JMP metal face Marshalls. A project that is about to put my first production examples in my hands in just a few more days. At first, I replaced the capacitors and serviced the amp. And I ran it for a while. Got familiar with playing through the beast. Loved it. Will love it again soon. It had a master volume mod added to it, but added in place of an input jack. I approve, no holes added. The saving grace of this very dirty old amp was that aside from being positively filthy, it was all original with no irreversible mods done to it. The impedance selector jumper socket was disabled, with the individual transformer taps being assigned to specific output jacks, which were labelled, albeit with a permanent marker. Fine, that's not unreasonable and actually very functional. I'll probably opt to stick with that setup and make a special back panel that is marked to match, thus making it look like a rare factory option that never existed. To clean the chassis took nothing less than a scraper to get the gunk off it. And under the gunk I found a few rusty spots and ALL the zinc galvanizing had gone dark grey to black. This was just not going to satisfy me. So I made the choice to do the full restoration. The chassis has been COMPLETELY stripped out, going so far as to drill out the rivets holding the tube sockets in. The chassis has been sanded clean and smooth with just a little bit of rust pitting left on it to bear witness to its history, and it has been re-galvanized and yellow zinc chromated, to original factory specifications. The transformers were partially disassembled (covers taken off) to reveal that they'd been serving as roach motels for many years. They got a good cleaning and I had the covers blasted clean and they also got re-galvanized and clear zinc chromated to original specs. The transformers were sent off to Mercury Magnetics to be tested, baked out to remove moisture from the coil formers, revarnished, and have their leads replaced with new, leaving generous lead length to allow room for a really good lead dress job. They should be back soon. All the small metal parts such as tube clamps and the transformer screws and clamps have also been blasted clean and galvanized to original specs. Some of the original brass screws were already broken or broke when I went to remove them due to metal fatigue. All new brass hardware has been obtained to replace them. This amp, being a late 1973 build, just missed the days of point to point wiring. It has a first generation ST1 board. It was filthy but not as dirty as the top of the chassis. The board was removed, carefully cleaned, and the capacitors that had been replaced in the past that would originally have been mustard caps were replaced with original mustard caps. (Just five on the board, the rest were still there.) The solder traces were carefully cleaned and resoldered with good flux, and cleaned again. Due to corrosion some traces had to be repaired by bridging wires soldered across those traces. The repairs are sound. It's getting all new tube sockets of the original type (NOS examples) and mounting system, with snap rings. I have lots of those in stock. The new preamp tube sockets will be upgraded to ceramic types, and will be riveted in as per original factory style. If I have a need to replace any components, every effort will be made to source original types, such as Piher resistors. Once the transformers arrive and I get the chassis back from the plater's next Tuesday, the reassembly will commence. The goal is to bring this amp as close as possible to being as it was in 1973. I've only made one change, a cosmetic choice, but one that was an available option in 1973. I'll leave that as a surprise when I post photos.