I had a heavily modded 72 Super Bass that had belonged to
Billy Duffy. THAT amp was the closest "plug in and play" Van
Halen lead tone I've heard. I sold it, but have a real love for
nicely modded early 70's JMP's. I love it when the tech was smart enough to put any new pots in existing holes, rather than mess up a chassis. The best mods sound killer, and can be removed without a trace. I see a lot of collectors wanting bone stock Marshalls, but honestly, some of the nicely modded ones
smoke the stock ones. I've seen some nice plexi mods that keep the stock tone, but add features like footswitchable masters, and good master volumes. I like those ones a lot.