If you were thinking of buying Eddie Van Halen’s Diver Down/1984 Kramer Frankenstrat but were holding off until you could find just the right amp to pair it with, look no further: Steve Vai is auctioning his Marshall 100 watt Plexi modified by the legendary Lee Jackson and used on David Lee Roth’s Eat ‘Em And Smile album, with some of the proceeds going to his Make-a-noise foundation.

There’s plenty of info at GuitarTV and on the eBay auction page itself, but here’s a snippet:

“The 100 watt Marshall JMP was given to Ted Templeman by Steve Stevens during the NYC recording sessions for “Eat Em and Smile.” The amp was then modded to Steve’s liking by Lee Jackson, famous for performing sought after custom modifications to Marshall amplifiers for top artists in the 1980′s and 1990′s. It was Steve’s main amp for the “Eat Em and Smile”sessions and used on the entire David Lee Roth tour. The 100 watt plexi head features an extra gain stage, frequency adjust control, effects loop & master volume. The head has been well maintained in Los Angeles and features matching Drake transformers, KT88 quad-matched power tubes & hand-selected pre-amp tubes to Steve’s liking.”