QUAD Vaccume Tube Amplifier Systems manual specifications, II-forty, II-classic, QC-twentyfour

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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