| Anthony De Maria Labs | Professional Tube Studio Equipment |
| ART ProAudio | Professional Tube Electronics |
| ASI - Amplifier Systems, Inc. Home Page | HF Tube Amplifiers |
| Audio Technologies | Tube Electronics for Professionals |
| Behringer International GmbH | Professional Tube Studio Equipment |
| Bellari - Professional Tube Sound Equipment | Professional Tube Electronics |
| Bext Corporation | Radio & Television Transmitters |
| Bitco Electronics | Custom build Pro Tube Audioamplifiers |
| Bonn Elektronik GmbH | Broadband RF Power Amplifiers |
| Broadcast Sofrate | Tube Electronics for Professionals |
| Canadian Communication Consortium | Broadcasting equipment |
| Coleman Audio | Tube Electronics for Professionals |
| Covimag | Tubes |
| Crystal Illusion Ltd. | Two channel Tube Compressor |
| D.W. Fearn Vacuum Tube Microphone Preamplifiers | Tube Microphone Preamplifier, Equalizer |
| DaviSound | Tube Preamplifiers, Tube Electronics for Professionals |
| DB Elettronica Telecomunicazioni S.p.A. | Tube Electronics for Professionals |
| dBm Pro Audio-Music Services! | Tubes, Tube Amplifier Services |
| Demeter Amplification | Guitar and Bass Tube Amplifiers |
| Drawmer | Professional Tube Electronics |
| Electronic Service | Radio Broadcast Tube Amplifers |
| Elenos broadcast experience | Tube Electronics for Professionals |
| Empower RF Systems | Tube Electronics for Professionals |
| Energiaki | Retailer, Tube Electronics for Professionals |
| Fairman Handcrafted in Denmark, main page | Professional Tube Studio Equipment |
| FM Transmitter | Tube Electronics for Professionals, Retailers |
| Funky Junk France | Tube Electronics for Professionals |
| Groove Tubes | Tubes and Eqipment for Musicians |
| Gyraf Audio | Tube Electronics for Professionals |
| HDB audio | Tube Electronics for Professionals |
| I. G. Electronics | Professional Audio Equipment |
| IFI | RF Tube Amplifiers |
| Jule Amps | Tube Guitar Amplifiers |
| Leeds & Northrup | Tube Type Amplifier for Measurements |
| London Power Amplifiers | Tube Amplifier Kits and Books for Musicians |
| Low Power Radio | Tube Electronics for Professionals, AM Transmitter |
| Lucas Engineering | High end professional audio equipment |
| Manley Labs | Tube Amplifiers |
| Mart | Tube Electronics for Professionals |
| Mercenary Audio | Retailer |
| Millennia Music & Media Systems | Music & Media Systems, Tube Mic Preamp |
| Music Valve Electronics | Tube Electronics for Professionals |
| Odyssey Pro Sound | Pro Audio Recording Equipment |
| PAiA Electronics Inc. | Tube Electronics for Professionals |
| Peavey Electronics | Tube Guitar Amplifiers and Electronics |
| Pendulum Audio | Class A Vacuum Tube Signal Processors |
| Prais S.r.l. | Tube Electronics for Professionals |
| Prana R&D | Tube Electronics for Professionals |
| Presonus | Tube Electronics for Professionals |
| ProRec | Tube Electronics for Professionals |
| Prostudio Audio | Broadcast, Replication, Media, Content |
| QEI | FM Transmitter Tube Amplifiers |
| Quarterwave | High Power Traveling Wave Tube Amplifiers |
| R.V.R. Elettronica S.p.A. Home Page | Broadcast Equipment |
| Red Rocks Audio | Tube Electronics for Professionals |
| Reference Tube | Tube Amplifiers, Tube Electronics for Professionals |
| Requisite Home Page | Professional Tube Electronics |
| Ridge Farm Studio | Tube Microphone Amplifier |
| SIEL Sistemi Elettronici | FM Single Tube Amplifiers |
| Sound Performance Lab | Tube Vitalizer |
| Summit Audio | Professional Tube Electronics |
| SWR Sound Corporation | Professional Tube Electronics |
| Thales Electron Devices | Vacuum Tubes Manufacturer |
| TL Audio | Tube Electronics for Musicians |
| TMD Technologies Limited | Microwave Tube Amplifiers |
| Universal Audio | Tube Electronics for Professionals |
| Vacuum-Tube Synthesizers | Metasonix |
| Vec s.r.l. | Tube Electronics for Professionals |
| Venus Hi-F | Retailer |
| Vintec Röhren Tube Valve Mischpult Console | Professional Tube Mixing Consoles |
| Xicom | Tube Electronics for Professionals |