“Factor out nostalgia. Forget the miracle of Quad making valve amps in the 21st century. Look at the Quads in terms of a current pre/power tube combination. Then look at the opposition. Now factor in gorgeous styling, superb build quality, perfect ergonomics, ample grunt, genuine heritage and the kind of sound which allows valve enthusiasts to show two fingers to transistor users.”

– Ken Kessler, Hi-Fi News

The Quad II-forty power amplifiers are much more than a tribute to one of the most famous designs in audio - they are both refined and powerful in the modern sense of the terms.

Although the circuit topology has changed little from the original, significantly better components and a brand new transformer design - still delicately balanced - means that they are fast, crisp and detailed, whilst producing an output current, more than capable of driving modern loudspeaker loads, even our own ESL loudspeakers are well within their capabilities.

The champagne finished chassis is strong and heavy, internally wired with solder tags - not PCBs. The KT-88 output valves in push-pull configuration are visually

stunning, sitting safely within a cage to protect them. Gold-plated phono connectors replace the ‘Jones’ plugs of the original - with a choice of 4ohm or 8ohm taps, allowing for the widest possible choice of loudspeakers. Every product we make is hand-built by craftsmen for a lifetime of duty. Quad products rarely, if ever, need replacing and we regularly service and maintain products over fifty years old.

This means many of the original Quad II amplifiers have been passed down, into the hands of the children - and even grandchildren - of the original owners, something that is uniquely Quad in essence. A product that is relevant today and will remain so for generations to come.

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QUAD Vaccume Tube Amplifier Systems manual Ken Kessler, Hi-Fi News
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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.
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