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Mono Bloc Valve Power Amplifier (Pair)

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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% @1W
  • Residual hum and noise: better than -80dB
  • Frequency response: 10Hz – 30kHz (referred to 8 Ohms)
  • Power consumption: 180VA maximum
  • Loudspeaker taps: 4 & 8 Ohms
  • Valves: 2x 6SH7 input; 2x KT88 output; 1x 5U4G rectifier
  • Input sensitivity: 1V RMS




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