Preamplifier
- Accuphase
- Akai
- Audia Flight
- Audio-Connection
- Audionet
- Audio Team
- AVM
- BASF
- Bose
- Brinkmann
- Burmester
- Camtech
- Canton
- Classé
- Denon
- Densen
- Epicure
- Fisher
- Grundig
- Harman/kardon
- Hitachi
- JVC
- Kenwood
- Krell
- Kücke
- Linn
- Luxman
- Marantz
- McIntosh
- Musical Fidelity
- NAD
- Naim
- Nikko
- Onkyo
- Optonica
- Paragon
- Parasound
- Philips
- Phonosophie
- Pioneer
- Pro-Ject
- QED
- RMS Audio
- Rotel
- Sanyo
- Sony
- T&A
- Technics
- Tensai
- Toshiba
- Uher
- Yamaha