Established in 2011 by Mike Congilosi II, Lightning Boy Audio designs and hand-crafts audio transformers and studio equipment in North Collins, New York. The company grew from Congilosi’s early vacuum-tube studio gear and pedals into a transformer-focused operation, with manufacturing, testing, and R&D conducted in its own laboratory. Its equipment is built in the USA around a longstanding interest in high-fidelity sound, tube character, and careful noise performance.
Rogue Audio, IncFrom its factory in Brodheadsville, Pennsylvania, Rogue Audio designs and hand-builds vacuum-tube amplifiers and related high-end audio equipment. Founded on the idea that serious amplifier performance should remain affordable, the company develops its electronics in-house and hand assembles and tests each product in the United States. Its lineup includes the long-running Cronus and Sphinx integrated amplifiers alongside phono and headphone components.BRODHEADSVILLE, PA
Linear Tube AudioFounded in 2015 by engineer and audiophile Mark Schneider, Linear Tube Audio builds high-fidelity tube amplifiers and DACs by hand in its Takoma Park, Maryland workshop. Its designs center on David Berning’s patented ZOTL technology, pairing tube naturalness with the clarity and control associated with solid-state audio. LTA’s equipment is built to order, extensively tested, and burn-in tested for a full week before shipment.TAKOMA PARK, MD
Purple AudioFounded by Andrew Roberts in 1997 after his work repairing high-end studio equipment in Manhattan, Purple Audio designs and manufactures recording equipment for professional, touring, and home studios. Now based in a restored historic fire company building beside Jim Thorpe’s Mauch Chunk Opera House, the Pennsylvania shop is known for the MC77 FET limiter and a broader line of analog studio gear. Live performances next door are also recorded through Purple Audio equipment for release as live albums.JIM THORPE, PA