Quad II - Eighty Valve Mono Power Amplifiers

QII-Eighty

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 philiosophies 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.

Technical Specifications:-
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