Electronics
- 562
- Butler Audio
- Manufacturer of tube class A monoblock amplifier and "Thermionic" vacuum tube multichannel power amplifier.
- 563
- Canor Audio
- Development and manufacture of audio components. Design and production of audio tube amplifiers. Slovakia.
- 565
- Channel Islands Audio
- Specialized in mono, stereo, headphone and phono amplifiers, and active and active pre-amplifiers. USA.
- 567
- Coda Technologies
- FET line stages and phono preamplifiers and bias class A power and integrated amplifiers such as Unison integrated amplifier.
- 569
- DB Systems
- Manufacturer of home audio equipment, including preamps, power amps, electronic crossovers, tone control, phase inverter, and accessories. USA.
- 571
- DeHavilland Electric Amplifier Company
- Manufacturer of two class "A" tube amplifiers: the Aries 845-G and the GM70.
- 573
- E.A.R. USA
- Makes tube and solid state stereo and phono preamplifiers and amplifiers, and headphone amplifier. USA.
- 574
- Edge Electronics
- Power, multi-channels, integrated amplifiers, pre-amplifiers using the proprietary Laser Optical Bias Circuitry technology.