Electronics
- 801
- Golden Middle
- Makes tubes amplifiers, preamplifiers, vacuum tubes components, sockets and transformers. Based in Saint-Petersburg, Russia.
- 803
- Hagerman Technology LLC
- Design and manufacture tube phonostage, moving coil headamp and professional studio products. USA.
- 811
- LA Audio Electronic
- Manufacturer of mono, stereo, integrated amplifiers and preamplifiers. Taiwan.