Quad II Classic Integrated Amplifier

Quad's classic range of amplifier and speaker components represent far more than a nostalgic trip down memory lane, each product represents as significant a design statement as their original counterparts.
For connoisseurs, the musicality and velvety richness of a valve power amplifier is without peer, yet component costs and system matching can present hurdles for all but the wealthiest enthusiast.
We are now proud to announce the Quad II-Classic Integrated:- a perfectly balanced and completely integrated amplifier system to resolve system matching and offer exceptional performance and value within a relatively compact and classically styled chassis.
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 phone 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 contemporary designs based on Quad's novel amplifier technology developed over half a century ago for his invention of the first Quad II Mono Amplifier introduced in 1953, our classic range of amplifier and speaker components represent far more than a nostalgic trip down memory lane. Each product represents as significant a design statement as their original counterparts.
The new Quad II Classic Integrated Amplifier is a perfectly balanced and completely integrated amplifier system to resolve system matching and offer exceptional performance and value within a relatively compact and classically styled chassis.
Performance, as you would expect from one of the most famous names in hi-fi, is nothing short of breathtaking. The 25watt-per-channel specified, belies their power and ability to drive even the most difficult loads. The remarkable output transformer design is characterized through its speed, agility and ability to convey the genuine passion of live performance.
The Quad II Classic Integrated Amplifier operates in Pure Pentode (Beam Tetrode) output with partial cathode loading, this being more linear than so called ultralinear. It is a pure Class A operation, whereas its push pull operation's efficiency can only reach 50% max and its power supply is the usual capacitor filter with diode bridge rectifier, AC 6.3 volts heaters to the valves that is shared between both channels.
Equipped with a bi polar transistor phono amplifier that uses 4 transistors per channel with low feedback to provide correct RIAA equalisation. Also has a gain switch for moving coil cartridges, 0.25mV at 1kHz, a circuit which operates from a regulated 36V derived directly from the main HT valve. It ensures a very high overload performance from records.
The phono circuit is housed in a shielded compartment providing low noise RF proofing within the main package.
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 ECCBB valves that both operate as a cascade circuit for high gain and wide bandwidth directly drives the output valves (KT66) via capacitors.
The circuit had to have high gain than a normal power amplifier to offer a nominal 250mV input sensitivity on the various inputs. Push pull feedback is arranged from the cathodes of the output back to the ECCBB valves to provide !ow distortion and noise with consistent performance.

Valves: 4 x KT66; 4 x 12AX7; 2 x 6922EH
Input Sensitivity: 275 mVrms (Line Level & Tape Monitor)
2 mVrms (MM)
200 µVrms (MC)
Output Power: 25 W per Channel into 8 Ω
Total Harmonic Distortion: 0.06% @ 15 W (700 Hz)
Hum and Noise: Better than - 98 dBA (ref 25 W into 8 Ω)
Frequency Response: 20 Hz - 20 kHz (+ 0 dB/- 1 dB)
Crosstalk: > 75 dB
Voltage Gain: 34 dB
Power Consumption: 195 W (max)
Dimensions: 310 (W) x 380 (D) x 200 (H) mm

Turnaround

Orders will usually dispatched within 2 working days of receiving cleared payment.

Shipping Rates

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Carriers

We despatch the bulk of our UK mainland items on a 24 hour service.  Non-Mainland locations – Isle of Man, Isle of Wight, the Scilly Isles, the Scottish highlands and Islands, the Channel Islands and Northern Ireland may take a day or so longer. Smaller items are delivered using Royal Mail 24 or special delivery. Larger items are delivered using a courier service such as UPS and occasionally by a Pallet service.

Order Tracking

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