ToneTron Amplifiers is a Minneapolis-based builder and repair shop specializing in hand-built custom guitar tube amps and amplifier repair, restoration, and modification. All work is done by Jeffrey Falla, author of “How to Hot Rod Your Fender Amp” (Voyageur Press), a widely respected book covering tube amp theory, building, and modifications. That hands-on expertise translates directly into the shop’s repair work, which covers vacuum tube and solid state amplifiers from virtually every major brand, including Fender, Marshall, Vox, Ampeg, Peavey, Roland, Orange, Carver, and Music Man. ToneTron also offers specialized rates for Fender Blues Jr. repairs and conversions of Fender Reissue amps from PCB to point-to-point wiring. On the custom side, the shop builds guitar and bass tube amps to order, from vintage clones to original designs, and Vintage Guitar magazine praised the Billy Rocker model for its versatility and pure tone. ToneTron rounds out its offerings with hi-fi tube amplifiers, phono and line preamplifiers, and pro-audio tube gear, serving the greater Minneapolis and St. Paul area.