Quad II Classic
The property which set the Quad II amplifier apart from other amplifiers of the time was its output stage. It was arranged such that the cathode coupled circuit emulated the performance of triode operation, but with the size and efficiency characteristics of pentode operation. It was this breakthrough that ensured the Quad II was to remain in continuous production until 1970. Peter’s circuit, notably the design of the output transformer, has become the stuff of legend amongst electronics engineers. Studied and analysed by the finest minds in the industry, the elegance and coherence of the design is still regarded as a reference today.
Given the quite modest components of the day, he was able to engineer something which was quite literally greater than the sum of its parts. The Quad II-Classic has been recreated accurately with output valves and input valves the equivalent of those used in the original design. The same balancing act has been employed to ensure the same wealth of detail and gentle tone of the original. The output valves produce around 15watts per channel, operating in Class A which, although slight by modern standards, allows a gloriously sweet and refined sound with appropriately matched contemporary loudspeakers.
Power Output 15WRMS
THD(@700Hz) 0.3% @12w
Residual hum and noise better than -90dB
Frequency response 10Hz - 20kHz (+0.2dB)
Damping Factor 11.75 @ 700Hz
Power Consumption 90Va maximum
Loudspeaker Taps 8 Ohm
Input valves 2 x EF86
Output valves 2 x KT66
Rectifier valve 1 x GZ34
Sensitivity 1.4V RMS
Es handelt sich hierbei um Stückpreise.