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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
II is 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.
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"The Quad II Classic
uses the finest quality
components, each
hard wired onto a
robust chassis with
solder tags.."
specifications
Model
II-forty
Power output
40W RMS
0.3% @ 40W
Thd @ 700hz
0.03% @ 1W
Better than -80dB
Residual hum & noise
10hz–30khz(+0dB/-0.5dB)
Frequency Response
damping Factor
20 @ 700hz
Power Consumption
180W maximum
4 ohm and 8 ohm
Loudspeaker Taps
Valves
2 x 6Sh7 Input
2 x KT88 output
1 x 5U4G Rectifier
Sensitivity
1V
RMS
*The Quad II Classic power amplifiers are supplied in matched pairs.
Model
QC-twentyfour
1 x 6111 twin triode
Valve Complement
Thd @ 1V RMS
‹0.2%
0.02% @ 1W
Frequency Response
5hz–50khz (+0dB/-0.5dB)
Better than -80dB
hum and Noise
15dB
Line Stage Gain
Recommended Min. Load
50k ohms
Inputs
5 x Line level
2 x Buffered tape loops
II-classic*
II-eighty
15W RMS
80W RMS
0.3% @ 12W
0.3% @ 40W
0.5% @ 80W
Better than -90dB
Better than -94dB
10hz–20khz(+0.2dB)
10hz–30khz(+0dB/-0.5dB)
11.75 @ 700hz
16 @ 1khz
90Va maximum
180W maximum
8 ohm
4 ohm and 8 ohm
2 x EF86 input
2 x 6Sh7 input
2 x KT66 output
4 x KT88 output
1 x GZ34 Rectifier
1 x 5U4G Rectifier
1.4V RMS
1V RMS
QC-twentyfour P
Valve Complement
4 x 6111
Thd
‹0.08% (A-weighted)
Frequency Response
20hz–20khz (+0dB/-0.5dB)
hum and Noise
Better than 60dB
Input Impedance
Moving magnet
47Ω
Moving coil
10Ω
Stage Gain
high sensitivity
1.3mV (MM)/130uV (MC)
Medium sensitivity
2.6mV (MM)/260uV (MC)
Low sensitivity
5.2mV (MM)/520uV (MC)
Nominal output level
(ref 5.2mV, MM, Low)
1.0
Inputs
Selectable MC/MM cartridge
outputs
1 x fixed line level
1 x variable line level
Power consumption
15 VA maximum
19
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