QUAD QUAD II-FORTY manual 1V RMS

Quad sound systems have always provided high levels of listening pleasure to their owners. Our philosophy has always been one of repro- ducing the ‘live’ experience in the comfort of your own home.

Whilst many modern amplifiers are stunningly accurate and offer breathtaking resolution and distortion figures in tiny fractions of a percent, many also loose sight of the overall aim - which for Quad, is to bring pleasure to the listener by recreating the entire range of sensory experi- ences felt at a live performance.

For many audiophiles, just as vinyl will never be truly replaced by digital music, the vacuum tube communicates on an emotional level that can never really be surpassed by a transistor based design.

The Quad II classic is one of the finest of these vacuum tube amplifiers. Although small in di- mension and modest in design, the purity with which it conveys, not just the musical score, but the sense of space; the passion of the vocal and the range of textures from the instruments in any performance, is without peer.

As a piece of audio history, the Quad II circuit was pivotal in creating what we know of as genu- ine ‘hi-fi’ today. As a design statement, the Quad

IIis not only as relevant today is it was over fifty years ago, it is remarkable in its absolute longev- ity. Yet the only important factor is that the Quad II Classic can bring the same pleasure to today’s discerning customer that has been experienced by generations of Quad enthusiasts.

“The Quad II Classic uses the finest quality components, each hard wired onto a robust chassis with solder tags..”

specifications

Model	II-forty	II-classic*	II-eighty
Power Output	40W RMS	15W RMS	80W RMS
THD @ 700Hz	0.3% @ 40W	0.3% @ 12W	0.3% @ 40W
	0.03% @ 1W		0.5% @ 80W
Residual hum & noise	Better than -80dB	Better than -90dB	Better than -94dB
Frequency Response	10Hz–30kHz(+0dB/-0.5dB)	10Hz–20kHz(+0.2dB)	10Hz–30kHz(+0dB/-0.5dB)
Damping Factor	20 @ 700Hz	11.75 @ 700Hz	16 @ 1kHz
Power Consumption	180W maximum	90Va maximum	180W maximum
Loudspeaker Taps	4 ohm and 8 ohm	8 ohm	4 ohm and 8 ohm
Valves	2 x 6SH7 Input	2 x EF86 input	2 x 6SH7 input
	2 x KT88 Output	2 x KT66 Output	4 x KT88 Output
	1 x 5U4G Rectifier	1 x GZ34 Rectifier	1 x 5U4G Rectifier
Sensitivity	1V RMS	1.4V RMS	1V 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	1.3mV (MM)/130uV (MC)
Line Stage Gain	15dB	High sensitivity
		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
		Inputs	Selectable MC/MM cartridge
	2 x Buffered tape loops
		Outputs	1 x fixed line level
			1 x variable line level
		Power consumption	15 VA maximum

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