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.

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