Audio by Van Alstine: Preamplifiers, amplifiers, digital-to-analog converters, and phase inverters, engineered and hand built in USA.

Ayre Acoustics, Inc.: Full line of audio and video components, hand-assembled in Boulder.

Big Lick Amps: Reproduction tube amps, inspired by the original Fender Tweed and Marshall JTM designs.

Brookwood Leather: Custom handcrafted leather guitar straps and amp handles.

Carr Amplifiers: Guitar amplifiers, made by guitarists for guitarists.

CI Audio: Headphone amplifiers, monoblock amplifiers, and power supplies.

Couch Guitar Straps: Guitar straps made from automotive and upholstery vinyl or recycled seatbelt material, made by a small company of working musicians.

Dean Markley Strings: Strings for classical and electric guitars, made in Kalamazoo, MI.

Elixir Strings: Coated strings for acoustic and electric guitar, bass, banjo and mandolin.

Fargen Amps: All tube guitar and bass amplifiers, handcrafted in USA.

KCS Loudspeakers: Custom horn loudspeakers, made in Wisconsin.

Manley Labs: Hi-Fi and professional recording gear, including mixers, preamplifiers, equalizers, limiters, and microphones.

Moog Music: MiniMoog Voyager analog monosynth, MoogerFooger guitar pedals, and Etherwave theremin, made in their NC facility.

Peaceland Guitar Rings: Guitar slides made from brass, stainless, or glass-coated metal combination for a range of tonal possibilities.

SanGreal: Acoustic instrument amplifiers designed for true reproduction of notes associated with acoustic instruments such as guitars, harps, violins, and pianos.

Scratchpad USA: A removable pad that clings without adhesive to protect guitar finish from scratches and dings caused by belt buckles, zippers, etc.

Synthesizers.com: Modular analog music synthesizers, assembled in USA with domestic and imported components.

Wedgewalls: Sound-absorbing and sound-diffusing panels, handmade in USA from American hardwoods.

Zinky Electronics: Electric guitar amplifiers and accessories including tube amps, speaker enclosures, and signal processors.