Time Electronics
Guitar and bass amplifier repair and mods.

Angela Intruments
Tubes, speakers, transformers, and other parts for vintage guitar and bass amplifiers. Also instrument parts.

Nashville Amplifer Service
Repair, restoration and modification of solid state and tube amps.

Plexi Palace
Repair and restoration of vintage amplifiers. Sales of amplifier parts. Site contains additional information and photos of vintage amps.

Amp Technician Registry
Clickable map of countries and US states from Weber Speakers leads to lists of repair technicians for amps, speakers, microphones and effects. Contact information, links, approximate fees, free submissions.