Owner`s manual

The QUAD II – forty power amplifier is a direct descendant of the legendary QUAD II

amplifier designed by Peter Walker, founder of QUAD and one of the guiding lights of early

Hi-Fi reproduction. Like the QUAD II, the QUAD II – forty uses the uniquely simple and

timeless circuit topology developed by Walker.

The modern listener demands a higher power output than the 15W of the original QUAD II.

The new QUAD II – forty uses larger output valves and a more robust power supply and the

input valves have been upgraded to military grade devices. Whilst the QUAD II – forty

retains the layout and styling of the QUAD II, the chassis size has been increased to take the

substantially larger components including mains and output transformers.

The QC – twenty four preamplifier uses a radically new and functionally simple audio circuit

and features relay input switching to preserve signal purity. With modern high quality

recording and reproduction equipment tone controls are now redundant and so the QC twenty

four dispenses with them. The styling of the QC – twenty four is classic QUAD and matches

the QUAD II – forty.

The QC – twenty four and QUAD II – forty are designed for the music lover. We make no

exaggerated performance claims and are content to let the results speak for themselves.

Thank you for purchasing this QUAD equipment. We can only hope that it will bring you

many years of listening pleasure, and that, like its illustrious predecessor, it will be a treasured

possession for you and for future generations of music lovers.

SPECIFICATIONS

Valve preamplifier

Valve complement 1x 6111 twin triode

THD @ 1V RMS < 0.2%

Frequency Response 5 Hz - 50 KHz (+0 dB/-0.5 dB)

Hum and Noise Better than - 80 dB

Line stage gain 15 dB

Recommended minimum load 50 k Ohms

Inputs 5 x Line level*

2 x Buffered tape loops

Power Consumption 15 VA maximum

* Note: Phono input is line level until optional phono stage is added

Monobloc valve power amplifier

Power output 40W RMS

THD @ 700 Hz 0.3% @ 40W

0.03% @ 1W

Residual hum and noise Better than -80 dB

Frequency response 10 Hz - 30 kHz (+0 dB/-0.5 dB)

Damping factor 20 @ 700 Hz (referred to 8 Ohms)

Power consumption 180VA maximum

Loudspeaker taps 4 and 8 Ohms

Valves 2 x 6SH7 Input

2 x KT88 Output

1 x 5U4G Rectifier

Input sensitivity 1V RMS