QUAD Vaccume Tube Amplifier Systems manual Specifications

Page 15

specifications

Model

II-forty

II-classic*

Power Output

40W RMS

15W RMS

THD @ 700Hz

0.3% @ 40W

0.3% @ 12W

 

0.03% @ 1W

 

Residual hum & noise

Better than -80dB

Better than -90dB

Frequency Response

10Hz–30kHz(+0dB/-0.5dB)

10Hz–20kHz(+0.2dB)

Damping Factor

20 @ 700Hz

11.75 @ 700Hz

Power Consumption

180W maximum

90Va maximum

Loudspeaker Taps

4 ohm and 8 ohm

8 ohm

Valves

2 x 6SH7 Input

2 x EF86 input

 

2 x KT88 Output

2 x KT66 Output

 

1 x 5U44G Rectifier

1 x GZ34 Rectifier

Sensitivity

1V RMS

1.4V RMS

*The Quad II Classic power amplifiers are supplied in matched pairs.

Model

QC-twentyfour

 

QC-twentyfour P

Valve Complement

1 x 6111 twin triode

Valve Complement

4 x 6111

THD @ 1V RMS

‹0.2%

THD

‹0.08% (A-weighted)

Frequency Response

20Hz–20kHz (+0dB/-0.5dB)

 

0.02% @ 1W

 

 

Hum and Noise

Better than 60dB

 

 

Input Impedance

 

Frequency Response

5Hz–50kHz (+0dB/-0.5dB)

Moving magnet

47Ω

Moving coil

10Ω

 

 

Hum and Noise

Better than -80dB

Stage Gain

 

Line Stage Gain

15dB

High sensitivity

1.3mV (MM)/130uV (MC)

Medium sensitivity

2.6mV (MM)/260uV (MC)

Recommended Min. Load

50k ohms

Low sensitivity

5.2mV (MM)/520uV (MC)

Nominal output level

 

 

 

 

Inputs

5 x Line level

(ref 5.2mV, MM, Low)

1.0

 

2 x Buffered tape loops

Inputs

Selectable MC/MM cartridge

 

 

Outputs

1 x fixed line level

 

 

 

1 x variable line level

 

 

Power consumption

15 VA maximum

 

 

 

 

 

 

 

 

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Contents C U U M T U B E a M P L I F I E R S Y S T E M S Page II-forty Ken Kessler, Hi-Fi News Page QC-twentyfour Noel Keywood, Hi-Fi World Page Page Page QC-phono stages II-classic Page Page Specifications Tel 0845 4580011, Fax 01480

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.