Owner`s manual

INSTRUCTION MANUAL
CONTENTS
Important notes ...............................................................................................3
Introduction.....................................................................................................4
Packing list and unpacking the equipment...................................................4
Guarantee and product registration..............................................................5
Service arrangements......................................................................................5
Safety and operation of electrical products ..................................................5
Mains working voltage and fuse ratings .......................................................6
Mains connections ...........................................................................................6
Installation .......................................................................................................7
Connecting the QUAD QC – twenty four preamplifier ................................8
Connecting the QUAD II – forty power amplifier ......................................10
Final System Connections.............................................................................11
Operation .......................................................................................................12
Additional information .................................................................................14
Specifications .................................................................................................16
Your QUAD valve amplification requires special care with installation and
operation if it is to function to its full potential.
Please read these instructions thoroughly before installing this equipment.
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Overall volume levels
Output levels from different audio source components in a high fidelity
system often vary dramatically. For instance, it is not unusual for a CD
player to produce levels significantly higher (18 dB and more) than an FM
tuner. So, always turn the volume control down before changing sources
as the resulting surge could damage your loudspeakers.
It follows that the position of the volume control is not an infallible guide
as to 'how loud' the equipment will go. Though the overload
characteristics of the QUAD II – forty are such that you will be able to
play your music at surprisingly high levels, if the sound is distorted, you
are probably overloading your equipment whatever the position of the
volume control.
Damping Factor
Damping Factor is the ratio of a loudspeaker's nominal impedance divided
by the output impedance of the amplifier. Because they use output
transformers and much lower levels of overall negative feedback, valve
amplifiers have modest damping factors compared with solid-state
amplifiers. The Damping Factor of the QUAD II – forty is 20 into 8 Ohms
at 700 Hz. This is entirely suitable for virtually all modern loudspeakers
and, of course, ideally suited to QUAD Electrostatic loudspeakers.
No damage can result through connecting a loudspeaker to the incorrect
terminal on the amplifier but the sound will be less dynamic and powerful.
Retrospect and Prospect
Apart from a very few specialised fields such as high power transmitters,
the valve has been obsolete in almost every walk of life for at least thirty
years and yet, it remains the equipment of choice for thousands of music
lovers and audiophiles the world over.
Audio amplification has been with us for almost ninety years and for over
fifty of those ninety, the name of QUAD has been synonymous with the
very best the world has to offer. In producing the QUAD II – forty and
QC – twenty four, our first new valve equipment for over thirty years, we
have re-visited the very roots of our being. We hope the result lives up to
your highest expectations.
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