QII
20Pages

Quad Valve Systems Perfect Ergonomics and Genuine Heritage

The history of Quad is one of technical achievement in the field of sound reproduction. It is a story that began with the Quad 1 amplifier, which brought the benefits of 15 years knowledge and experience in professional audio and industrial products to the task of making the most accurate domestic audio amplifier the product which set the standard for amplifiers was the Quad II Power Amplifier, the time of Queen Elizabeth's Coronation and the year in which Mount Everest was finally conquered. This amplifier pioneered the principle of cathode coupling through the output transformer to reduce...

Valve Amplification System Quad II power amplifiers are arguably one of the most important products in the history of hi-fi. Now, decades after the original was created by Peter Walker in 1953, we have launched a number of valve amplification systems including the Quad ll-forty and the Quad ll-Classic power amplifier. Not only are these power amplifiers some of the finest sounding valve pre/power combinations available to date, but the genuine heritage and craftsmanship of the original has been preserved in its exquisite styling. For many audiophiles, the age of transistor left a big hole...

This is 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 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 The property which set the Quad II amplifier apart from other amplifiers of the time was its...

hi-fi news "Musicians and recording artists all over the world have long recognised the outstanding quality of Quad products - exquisite engineering, build-quality, Quad II classic ESSa 2. indd

80 WATT MONO BLOCK POWER AMPLIFIER The Quad ll-eighty valve amplifier is the perfect partner to our ESL speakers. Designed by one of the most famous tube-amplifier designers in the world, Tim de Paravicini, the Quad ll-eighty takes inspiration from the original Quad II amplifier. It is an 80-Watt mono power amplifier following in the tradition and philosophies of Peter Walker. The output section consists of 4 KT88 valves running as two pairs in push pull with the hallmark Quad topology of partial cathode loading in the output This method reduces distortion when compared to the usual Ultra...

"Truly a Quad for the 21st Century, and HIGHLY m a more convenient package than you COMMENDED can imagine, it's a triumph'' - Ken Kessler, Hi Fi News (January 2010)

ll-Classic Integrated The rekindled interest in 2 channel analogue hi-fi has been remarkable to witness. The popularity of vinyl has grown steadily over the last 5 years and now represents a significant proportion amongst real music enthusiasts. Quad has been at the forefront of this trend with its development of some of the world' s most stunning amplifiers, loudspeakers and phono stages. Creating a compact audiophile integrated solution for LP and Vintage Hi-End Audio lovers while working in collaboration with one of the industry's esteemed legendary figures, Tim DeParavicini. Through his...

The KT-66 output valves, in push pull configuration are visually stunning, even when safely secured within the cage that protects them. Each valve produces around 25-Watts per channel output in 'Pure Class A' which allows a superbly refined sound that appropriately matches modern as well as contemporary loudspeakers. The package had to retain the retro look of it famous preamplifier predecessor with the power amplifier and transformers blended into a modern compact look. It has an understated elegance which lies beneath its smooth curves and lustrous finish because it uses a circuit dating...

"The Quad offers a degree of entertainment that's hard to find elsewhere in high fidelity. It's a masterful product../'

Integrated Amplification Process The Quad II Classic Integrated Amplifier output is 25 watt per channel integrated amplifier had to obey Peter Walker's philosophy of cathode loading of the output stage and simplicity of design. Upon input, a selector switch routes the required signal to the volume control then on to the first of 3 small driver valves. This first valve is an ECC83 acting as a differential balance circuit that is a phase slitter. The output going into a pair of ECC88 valves that both operate as a cascode circuit for high gain and wide bandwidth directly drives the output...

The Quad Model Valve Type 25W per Channel into 8 Ohms Better than -95dBr(ref 25W into 8R) Frequency Response 3 x Line level,1 x MM/MC Phono(selectable) and Tape Monitor Stereo Power Output Input Channel QII Classic Integrated Amplifier

Model Mono Power Output THD @ 700Hz Residual hum & noise Frequency Response Damping Factor Power Consumption Loudspeaker Taps Valves Model Valve Complement THD @ 1V RMS 2 x 6SH7 Input 2 x KT88 Output 1 x 5U4G Rectifier 2 x EF86 input 2 x KT66 Output 1 x GZ34 Rectifier 2 x 6SL7 input 4 x KT88 Output 1 x 6SN7 Rectifier QC-twentyfour P Valve Complement THD Frequency Response Hum and Noise Frequency Response Line Stage Gain Recommended Min. Load Inputs 50k ohms 5 x Line level 2 x Buffered tape loops Input Impedance Moving magnet Moving coil Stage Gain High sensitivity Medium sensitivity Low...

Quad E lectroacoustics Ltd, IAG House, S overeign Court, Ermine B usiness Park, Huntingdon, Cambs, P E29 6 XU Tel : 01480 447700, Fax : 01480 431767 www.quad-hifi.co.uk The information in t his leaflet i s subject to change w ithout notice.All rights reserved © 2008 Q uad Quad i s a member o f the International Audio Group.CODE:106-QU9L080001