| Butler Audio's Latest Amp For Your Car! == TUBE DRIVER BLUE == | Car Tube Hybrid Amplifiers |
| Hssfidelity | Car Tube Preamplifiers, Capacitors |
| Milbert Amplifiers | Tube Amplifiers for Cars, Tube X-Over |
| Poweramper Manufacture of Car Audio | Car Tube Amplifers |
| Precision Power | Car Tube Amplifiers |
| Tube Driver! | Car Tube Hybrid Amplifiers |
| U.S.Amps | Car Tube Amplifiers |