Electronics
- 581
- Halcro Amplifiers
- Manufacturers of mono, power, integrated, and pre amplifiers for stereo reproduction and home theater.
- 583
- Klyne Audio Arts
- US manufacturer of System Six pre-amplifier, System Seven pre-amplifier and interconnects.
- 584
- Korato
- Manufacturers of tube and solid state amplifiers and pre-amplifiers. Based in Belgrade, Serbia.
- 588
- London Power / Power Press Publishing
- Power amplifiers and amplifier products, do-it-yourself kits, and power press books by Kevin O'Connor. Canada.
- 589
- ME Sound
- Amplifiers and pre-amplifiers that integrate zero loop feedback and near constant operating temperature technologies.
- 590
- MagnaTec
- Manufacturer of amplifier range of class D intended for use in professional audio systems. UK.
- 591
- Marchand Electronics Inc.
- Manufacturers of equipment such as electronic crossover networks, both solid state and vacuum tube and modular audio amplifiers.
- 594
- Matthew James
- Manufacturer of amplifiers Rhapsody 2 or 3 channels, strings interconnect/speaker cables and podium isolation fee. USA.
- 595
- McAlister Audio
- Specializing in vacuum tube amplifiers. Custom design and build high end audio amplifiers. Repairs and restoration. Canada.
- 597
- NAT - Nikic Audio Team
- Single-ended triode, low- or no-feedback amplifiers and preamplifiers. Hand-wound transformers.