Northeastern Audio Corporation, operating as Tonetronix Boutique Guitars in Hubbard, Ohio, is a full-service guitar and amplifier repair shop that also carries a carefully curated selection of boutique gear. On the repair side, the shop handles electronic repair and amp repair as a factory authorized service center for a long list of major brands including Fender, Marshall, Mesa Boogie, Ampeg, Peavey, Korg, Yamaha, and many others. Vintage tube amp restoration is a specialty here, with technicians experienced in bringing classic amplifiers back to life. The shop also handles stringed instrument repair and pro audio equipment repair.

Speaker repair and reconing services round out the technical offerings, covering vintage guitar amplifier, organ, hi-fi, and PA applications. Reconing is available for Jensen, Celestion, JBL, EV, Altec Lansing, Eminence, and numerous other speaker brands, with custom reconing options available to change ohm ratings or power handling. For customers shopping for gear, the store carries boutique guitars from LSL, amplifiers from Bogner, Bad Cat, and 65AMPS, and effects pedals from Eventide, Way Huge, and Wampler.