Accuphase
Acer
Acoustat
Acoustic Research
ADC
Adcom
Aiwa
Akai
AKG
Altec
Alpinr
American Audio
Apex
Arcam
Arena
Audio Research
Audio Technica

Bang & Olufsen
Barthe
Benytone
BIC
Blaupunkt
Bluenote
Bogen
Bose
Boston Acoustics
Bouyer
Brandt
Braun
Breuer Dynamic
Bruel and Kjaer
Bryston
BSR
BST
B&W

Cabasse
Cambridge Audio
Carver
CEC
Celestion
Connoisseur
Continental Edison
Continuum Audio
Coral
Creek
Crosley Radio
CS Audio
Cyrus

Denon
Dual
Dynaco
Dynamic Sound Devices
Dynavector
Dynavox

Eico
ELAC
Elipson
Empire
ERA
Esart
Expelec

Ferguson
Ferrograph
Filson
Fisher
Fluance
Focal

Hafler
Harman Kardon
Heathkit
HH Scott
Hitachi

Infinity
Inkel
ION Audio
ITT

Jbl
JMlab
JVC

Kef
Kenwood
KLH
Klipsch
Knight
Körting
Krell

Lafayette
Leak
Leep
Lenco
Linn
Luxman

Marantz
Mark Levinson
McIntosh
Megasonics
Micro Seiki
Micro-Acoustics
Mitsubishi

NAD
Nagaoka
Nagra
Naim
Nakamichi
National
NEC
Nikko
Nordmende
Numark

Onkyo
Optonica
Ortofon

Perpetuum-Ebner
Phase Linear
Philips
Phonia
Pickering
Pierre Clement
Pink Triangle
Pioneer

QED
Quad
Quadraflex
Quasar

Radford
Radiola
Radio Shack
Realistic
Red Rose Music
Reed
Rega
Revac
Revox
Roberts Radio
Rogers
Rotel

SABA
SAE
Sansui
Sanyo
Satin
Scientelec
Scott
Setton
Sharp
Sherwood
Shinola
Shure
SME
Sony
Stax
Studer

Tandberg
Tangent
Tannoy
Tascam
Teac
TEC
Technics
Tectronic
Telefunken
Teleton
Tensai
Thomson
Thorens
Threshold
Toshiba

Uher

Vector Research

W Electric
Wharfedale

X-Quisite

Yamaha
Yves Cochet

Zenith

3A
47 Laboratory