Designed by Tim DeParavicini, the QUAD II-Eighty takes inspiration from the original QUAD II amplifier. It is an 80-Watt mono power amplifier following in the tradition and philosophies of Peter Walker. The output section consists of 4 KT88 valves running as two pairs in push-pull with the hallmark QUAD topology of partial cathode loading in the output transformer.
Specification
| Input Sensitivity (nominal) | 1V RMS for full output |
| Power Output | 80W RMS |
| Output Impedance | 4 Ohms or 8 Ohms, selectable |
| THD @ 80 Watts | 2 x EF86 |
| 0.5% – 30Hz – 15kHz | |
| 1.0% – 20 – 20kHz | |
| Residual Hum and Noise | Better than -94dB |
| Frequency Response | 10Hz – 30kHz ( 0dB, -0.5dB) |
| 3Hz – 50kHz (-3dB) | |
| Damping Factor | 16 @ 1kHz (referred to 8 Ohms) |
| Power Consumption | 240VA maximum |
| Valves | 2 x 6SL7 |
| 1 x 6SN7 | |
| 4 x KT88 |
