Quad QII-Eighty Mono Power Amplifiers (Pair) A Modern Tribute to a Classic Design The Quad QII-Eighty Mono Power Amplifiers (pair) reimagines the iconic Quad II amplifier, blending vintage aesthetics with contemporary engineering. Designed by Tim de Paravicini, this amplifier maintains the original's cathode-coupled circuit topology, ensuring a harmonious balance between warmth and clarity. Robust Valve Configuration Equipped with four KT88 output valves, two 6SL7 input valves, and a 6SN7 driver valve, the QII-Eighty delivers 80W RMS in pure Class A operation. This configuration provides ample power to drive modern loudspeakers, including Quad's own ESL series, with ease and precision. Enhanced Performance The QII-Eighty boasts impressive specifications: Total Harmonic Distortion (THD): 0.5% at 30Hz–15kHz, 1.0% at 20–20kHz Frequency Response: 10Hz to 30kHz ( 0dB, -0.5dB), 3Hz to 50kHz (-3dB) Residual Hum and Noise: Better than -94dB Damping Factor: 16 at 1kHz (referred to 8 Ohms) These figures reflect the amplifier's ability to reproduce audio with exceptional clarity and minimal distortion. Versatile Loudspeaker Compatibility The QII-Eighty offers selectable 4 and 8-ohm loudspeaker taps, providing flexibility to match a wide range of loudspeakers. This versatility ensures optimal performance across different speaker impedances. Feature Details Power Output 80W RMS Total Harmonic Distortion 0.5% at 30Hz–15kHz, 1.0% at 20–20kHz Residual Hum and Noise Better than -94dB Frequency Response 10Hz to 30kHz ( 0dB, -0.5dB), 3Hz to 50kHz (-3dB) Damping Factor 16 at 1kHz (referred to 8 Ohms) Power Consumption 240VA maximum Loudspeaker Taps 4 and 8 Ohms Input Valves 2 x 6SL7 Driver Valve 1 x 6SN7 Output Valves 4 x KT88 Input Sensitivity 1V RMS Dimensions (H x W x D) 185 x 200 x 390 mm Weight 18.3 kg
