| Alpha-Core Inc. | Cables, inductors |
| Digitex | Tube Amplifier Kits, Tubes, Speakers, Parts |
| Hifisound der Lautsprecherspezialist | German Speaker Distributor |
| Intertechnik | Speakers and Components |
| Jantzen Audio | Foil inductors for crossovers |
| Mundorf-Online | Parts not only for speakers |
| North Creek Music Systems | Speakers |
| RF Parts Company™ Amateur Radio Catalog | Tubes, Parts |
| Schuro - Elektronik | Parts |
| Solen | Capacitors, Speakers, Inductors |
| Steinmusic | Parts, Tubes |
| Surplus Sales of Nebraska Index | Parts, Tubes |
| THEL Audio Engineering | Tube Amplifier Kits, Tubes and DIY Parts |
| THL Audio | Parts |
| Welborne Labs | Tube Amplifier Kits, Tubes and Parts |