The total line gain is 15dB, with a high quality potentiometer controlling the output levels. Reminiscent of the original QC-22 control module, there is a simple balance control allowing for variation from left to right of up to 12dB.
Amplification is provided courtesy of a twin triode 6111, new old-stock valve - originally designed for use in the guidance systems of missiles and manufactured to exceptionally high tolerances. The remarkably long expected life-span of this valve means we can comfortably build it into the PCB without the compromises usually experienced when using valve seats.
Two buffered tape loops are provided as standard.
Ken Kessler, Hi-Fi News

“Quad has succeeded where few of hi-fi’s gamblers dare: They’ve followed the ESL-989 with not just a worthy amplifier, but with a silent smooth and precise control unit as well.” -

Peter Walker always believed that an amplifier should be as simple as possible - engineer with the fewest possible components and with a performance largely independent of those components.

The QC-twenty-four, a low-noise RIAA curve phono stage has an understated elegant simplicity, although we use high quality components wherever these appear in the signal path.

Bifurcated contact relays (crossing each other at right angles to make a better contact) are used on each input to maintain the best possible signal conduction. Gold- plated connectors and a carefully screened enclosure are further examples of the attention to detail throughout the construction.

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QUAD Vaccume Tube Amplifier Systems manual
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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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