| A Sound Amplification | Retailer |
| Aanvil audio | Retailer |
| Abe Music | Retailer, Tubes |
| Acoustic Image | Retailer |
| Acoustic-Dimension | Retailer |
| Ali Audio | Retailer, Forums |
| Alium Audio | Retailer |
| Alva Musical Instruments, LLC. | Tubes, Tube Amplifier Service |
| Ambrosia Audio & Video | Retailer |
| Amp Shop | Retailer, Tube Amplifier Services |
| Amplifier Reviews at audioreview.com | Audio equipment website |
| Analog Tube Audio | Phono Tube Preamplifier |
| Audible Illusions at Walrus Systems hifi | Good description of the Modulus 3a Ph. pre. |
| Audio Advancements | Earmax OTL Headphone Amp |
| Audio Advisor | Retailer, Tubes |
| Audio and Visual shop Ashikaga | Retailer for Ex-pro Sound and SD Sound Tube Amplifiers |
| Audio bricolos | Retailer |
| Audio Connection | Retailer |
| Audio Gold Online | Retailer |
| Audio limits | Retailers |
| Audio Note | Retailer |
| Audio Note France Haute fidélité ŕ tubes | Retailer |
| Audio Oasis.com | Retailer, Tubes |
| Audio Odyssey | Retailer |
| Audio Outlet | Retailer |
| Audio Shopper | Online retailer, Equipment Review Archive |
| Audiofool | Retailer, Tubes |
| Audiogon | High end audio auctions, classifieds, hifi chat |
| AudioProphile | Retailer |
| Audiosales Pro Audio Equipment | Retailer |
| Audiospecialist | Retailers |
| Audioweb | Reviews, links, discussions, ... |
| Auditorium 23 | German retailer for Shindo Tube Amplifiers |
| Axiss Distribution | Retailer for Air Tight Tube Amplifiers |
| Aydn | Retailer |
| AYDN Vacuum Tube Audio | Tubes, Retailer |
| Bass Northwest | Retailer |
| Bertrand Audio Imports | Retailer |
| Black Forest Audio | Retailer |
| Canadian Hi-Fi Exquisite Used Audio | Retailer |
| Cary Audio Design | Yahoo store |
| Cary Audio Design, Inc. | Tube Amplifiers |
| CE Distribution LLC Tube Accessories | Parts, Tubes |
| CF media | Retailers, Beard Tube Amplifiers |
| Charisma Audio | Retailer |
| Class A High Performance | Retailer |
| Classic Audio, Hi-Fi, Stereo, Tubes | Classic Audio, Hi-Fi, Stereo, Tubes, Speakers |
| Classic Audio, Hi-Fi, Stereo, Tubes, Speakers | Classic Audio, Hi-Fi, Stereo, Tubes, Speakers |
| Club l'Auditorium | Retailer |
| Conrad Electronik | Retailer |
| Consonance Home | Retailer |
| Corda Audio | Tube Amplifiers, Retailer |
| Cosmos Hi-Fi - El Arte | Retailer |
| Custom Sounds | Retailer |
| Daiyoung | Retailer |
| Deja Vu Audio - Amplifiers | Retailer |
| Dinleti Music | Retailer |
| Divertech.com | Retailer |
| Dynamic Audio | Retailer |
| eCoustics.com - Everything Hi-Fi Online | Online Hi-Fi |
| Eifl | Japanese site about audio and tube amplifiers |
| Elderly Instruments Elderly Instruments | Books, Instruments Retailer |
| ELV online | Tube Amplifier Kits, Parts |
| Emission Lab | Japanese Tube Amplifiers |
| Energiaki | Retailer, Tube Electronics for Professionals |
| enVogue 24 | Retailer |
| Eufonia | Retailer |
| Ex-demo hifi - hi-fi & audio | Used Gear |
| Fine Audio | Retailer |
| FL-electronic HiFi | Tubes, Audio retailer |
| FM Transmitter | Tube Electronics for Professionals, Retailers |
| Fredmusic | Music Shop for Tubes, Guitar Tube Amplifiers |
| Fricco Referenz Audio | Retailer |
| FS Audioweb | Retailer for Croft, EAR, TRI Tube Amplifieres |
| Full Compass Systems | Professional Audio, Video, Lighting Equipment |
| G T Audio | Tube Amplifiers Services, Retailer |
| GMF | Retailer, Tubes |
| GOFF Professional Online | Equipment for Professionals |
| Hairball Music | Tube Guitar Amplifiers |
| Hal | Tubes |
| Harper's Guitars | Tubes, Tube Guitar Amplifiers |
| Hi Fidelity Audio | Retailer |
| Hi-Fi Choice | Tube Amplifiers, Shindo Lab. Retailer |
| Hi-Fi Forum - Distributors of Fine European Audio Equipment | Pathos Hybrid Amplifier |
| HiFi-Analyse | Tube Amplifiers, Retailer |
| Hifizeile | Retailer |
| High End Audio | Retailer |
| Imaico | Japanese Audio Distributor, Dealer |
| Island Audio | Retailer, Books & Software |
| JC Audio | Retailer |
| Jena Labs | Retailer |
| JM Audio | Retailer, Vacuum Tubes Retailers New and NOS Tubes |
| Klubben.net | Retailer |
| kr Audio Products | Retailer |
| Krypton | Retailer, Tube Amplifier Kits |
| Krystal Clear Audio - Video | Retailer |
| L.A. Music Distribution | Retailer |
| L'ATOUT Highend products | Retailer |
| Lautsprecher -Bau-Kunst LA DIVINA MUSICA! | Speakers, Retailer |
| Mercenary Audio | Retailer |
| Michael Audio | Tubes, Vintage Tube Audio Equipment, Retailer |
| O. S. Services Audio Distribution | Audion and Cadence Tube Amplifiers |
| Odyssey Pro Sound | Retailers |
| Odyssey Pro Sound | Pro Audio Recording Equipment |
| Okmusic | Retailer |
| Osborn Loudspeakers | Speakers, |
| OUĎR Lautsprecher der Spitzenklasse | Speakers, Retailer |
| Post-Modern | Retailers |
| Prostudio Audio | Broadcast, Replication, Media, Content |
| RCC | Retailer |
| Response Audio | Retailer |
| Retrodaze Audio Products | Retailer |
| Rik Stoet - Holland | Retailer |
| Sage Audio | Retailer |
| Sascom Marketing Group | Studio Equipment |
| Savant Audio | Retailer for Tube Amplifiers |
| Serlui | Retailer |
| Sibatech | Distributor of Kondo and MCS Tube Amplifiers |
| Signature Sound | Retailer |
| SilvaWeld | German distributor Tube Amplifiers |
| Sound Technology plc | Retailer, Tubes |
| Soundberry | Retailer |
| Soundbox | Retailer |
| Soundlabs Group | Retailer |
| Soundscape | Audio + Video + Art, HIFI, Stereo, Audio |
| Soundsgreatmusic | Club |
| Southern Electric Audio | Retailer, Articles, Altec Ecperimenter Info |
| Speakers Delight | Speakers, Retailer |
| Stoneaudio UK | Sonic Link 211SE Tube Amplifier |
| Studio M | Retailer, Capacitors, Transformers, Resistors, Speakers, Articles |
| Subas Audio Marketing | Retailer |
| Supravox | Distributor of Supravox |
| Take Five Audio | Retailer |
| The Fine Music . | Retailer |
| The Hifi Authority | Retailer, Speakers |
| Tiberigroup | Retailer |
| TMH Audio | Retailer of WAVAC, MIYABi, Köchel |
| TransAmerica Audio Group | Retailer |
| Tri-Cell Enterprises | Retailer |
| Triode & Company | Retailer |
| Tube Audio Professional | Tubes |
| Tubeprofi.com | Tubes |
| Tubesound Audio | Retailer |
| Tubeworld | Tubes, Capacitors, Retailer |
| United Home Products | Retailer, Pics |
| Uptown Audio | Retailer |
| Venus Hi-F | Retailer |
| Vintage King Audio | Vintage Tube Audio Equipment |
| Vintage Sound | Vintage Hifi, NOS tubes |
| Vintage Tube Amplifiers | Retailers |
| Willy Prastana | Retailer |
| WODAudio VAIC Audio | Retailer |
| Yama's Enterprises Inc | Retailer |
| Yoshidaen | Japanese Tube Amplifiers and more |
| Z Audio | Retailer |