QII-Forty
Power Amplifier
The Quad II-forty power amplifier is much more than a tribute to one of the most famous designs in audio – but refined and powerful in the modern sense of the terms. Although the circuit topology has changed a little from the original, significantly better components and a brand new transformer design have been engineered. While still being delicately balanced a fast, crisp and detailed sound is achieved, whilst producing an output current suitable for modern loudspeakers, including our very own ESL. KT-88 output valves work in a push-pull configuration, while a choice of 4 Ohm or 8 Ohm taps allows for a wide choice of loudspeaker configurations.
| Power Output | 40W RMS |
| THD @ 700Hz | 0.3% @ 40W |
| 0.03% at 1W | |
| Residual Hum and Noise | Better than -80dB |
| Frequency Response | 10Hz - 30kHz (+0dB, -0.5dB) |
| Damping Factor | 20 @ 700Hz (referred to 8 Ohms) |
| Power Consumption | 180VA maximum |
| Loudspeaker Taps | 4 and 8 Ohms |
| Valves | 2 x 6SH7 Input |
| 2 x KT88 Output | |
| 1 x 5U4G Rectifier | |
| Input Sensitivity | 1V RMS |
