- AB International
 - Professional sound reinforcement & equalization products. - Amplifier Technologies, Inc.
- High-power, multi-channel amplifiers for audio and home theatre applications.
- Atma-Sphere Music Systems
- Designs and creates preampliers and amplifiers, using balanced differential design.
- Audire, Inc.
- Manufacturer of high-end audio hardware.
- Avalon Design
- Discrete/vacuum tube preamplifiers, compressors, equalizers power amplifiers and consoles.
- Ayre Acoustics, Inc.
- Pre and power amplifiers.
- Balanced Audio Technology
- Vacuum-tube and solid-state electronics including neutral, musical, and BAT products.
- Bedini Electronics, Inc.
- Includes product reviews, dealer information, and more.
- BONNEC Audiosystems
- Designing amplifiers with a unique circuit design.
- Boostaroo
- Portable audio amplifier that works with CD/tape players, computers, laptops, helmet headsets, and more.
- Boulder Amplifiers
- Produces audio products for the home enthusiast and the professional market.
- Joule Electra
- Produces hand-crafted, pure tube, high-end audio amplifiers and preamplifiers.
- Lab.Gruppen
- Makers of power amplifiers that are light, small and yet extremely powerful.
- MTX Audio
- Makers of high performance car, home, and professional audio products.
- Spectron
- Makes digital switching amplifiers.
- Tripath@
- VTA
- Hand crafted manufacturing and direct sales of high-end audio vacuum tube amplifiers.
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