The Quad

II-classic

A faithful reproduction of the original, the new Quad II Classic offers audiophiles the chance to recreate the spirit and atmosphere produced from one of the most famous amplifiers in audio history.

The original Quad II was first launched in 1953, designed by Peter Walker. At the time, many of his contemporaries were also producing good quality valve amplifiers. The Quad II looked, in comparison, very simple and unassuming, but its performance was far beyond that which its diminutive dimensions might suggest.

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 15w per channel, operating in Class A which, although slight by modern standards, allows a gloriously sweet and refined sound with appropriately matched contemporary loudspeakers.

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QUAD Vaccume Tube Amplifier Systems manual II-classic

Vaccume Tube Amplifier Systems specifications

QUAD Vacuum Tube Amplifier Systems represent a remarkable blend of vintage audio engineering and modern technology. Known for their warm, rich sound and characteristically smooth midrange, these amplifiers appeal to audiophiles and music enthusiasts alike. The heart of these systems lies in the use of vacuum tubes, a technology that offers unique audio qualities distinct from solid-state components.

One of the main features of QUAD Vacuum Tube Amplifiers is their power output versatility. Typically, these amplifiers provide outputs ranging from a few watts to over 30 watts, suitable for driving a variety of speakers effectively. This low-power design is particularly advantageous for small to medium-sized listening rooms, where subtle nuances in music can be appreciated in high fidelity.

The construction quality of QUAD amplifiers is another standout characteristic. These devices are meticulously handcrafted using high-grade materials, ensuring durability and longevity. Many models feature eye-catching designs that harken back to classic tube amplifiers, complete with robust chassis and vintage-style knobs, creating an aesthetic appeal that complements any audio setup.

In terms of technology, QUAD employs advanced circuitry to enhance sound quality. Their amplifiers often incorporate low-feedback designs, which preserve the dynamic range and authenticity of recordings. This approach reduces distortion, allowing the listener to experience music as it was intended. Certain models also utilize push-pull output stages to maximize efficiency and deliver clearer sound reproduction.

QUAD is also committed to ensuring user-friendliness in their vacuum tube amplifiers. Typically equipped with intuitive controls and indicators, these systems make it easy for users to adjust volume levels and input sources effortlessly. Additionally, many models allow for tube rolling, where audiophiles can experiment with various vacuum tube types to tailor the sound to their personal preferences.

Overall, QUAD Vacuum Tube Amplifier Systems offer a unique listening experience characterized by their rich tonal qualities, impressive power capabilities, and elegant craftsmanship. Their dedication to high-quality acoustics and advanced technologies positions them as a coveted choice in the realm of high-fidelity audio equipment, ensuring that music lovers can enjoy their favorite tracks with unparalleled warmth and depth.