Turn your Marshall Class 5 into a fire-breathing vintage Marshall — at neighbor-friendly volume. Stock, the Class 5 is a cool little amp but it can be too gainy, dark, muffled, and mushy. A few simple mods bring back the crunchy Marshall crunch of yesteryear in a small package you can actually turn up.

• Adds clarity and revoices the tone control to mid-to-late-'60s Marshall spec
• Brings out those sweet, crunchy Marshall mids
• More power-supply filtering to remove the low-end mush
• Runs the (normally very hot) power tube cooler for longer tube life

Want to go all the way? The Supreme version includes everything here plus a beefier output transformer to make the amp all it can be.

We're always sourcing the best-sounding parts, so your kit may look a little different from the photo — the electronic values are equivalent.

Safety note

Working inside a tube amp involves deadly voltages, even when it's unplugged. If you're not fully confident, have a qualified tech install the kit.