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