Equipment Mods & Repair
- Curcio Audio Engineering - High end audio kits and products. Preamps, Power Amps, Tube Digital Processor. Dynaco Repair, Restoration, & Modification Center. Vacuum tube repair & restoration. Home of The Dynaco Doctor.
- Deltronics Pro Audio Repair - Chicago's premier service center, providing expert repair work for consumers, musicians and audio/video professionals. Expertise includes repair/restoration of vintage audio equipment.
- Empirical Design - A company from Oregon that manufactures high-end audio analog and digital interconnects, speaker and power cables, and computer cables. They sell primarily to end users over the Internet. They also recently started modifying audio components. Their modifications include improving power delivery, signal paths and digital circuitry where applicable. They modify mostly DVD & CD players, DACs and solid-state amplifiers.
- Modwright Instruments - Audiophile-level modifications to amps. preamps CD Players and DACs.
- Musical Concepts/Musical Design - Amp, preamp, CD player mods as well as their own amps, preamps & DACs.
- SDS Audio Labs - Vintage audio equipment refurbishing.
- The Upgrade Company - Leader in High Performance Audio Video Upgrades.