Quad Twenty-Four Owners Manual
Valve
Phono Preamplifier
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Quad Electroacoustics Ltd, IAG House,
Sovereign Court, Ermine Business Park,
Huntingdon PE29 6XU
United Kingdom
www.quad-hifi.co.uk
Tel: 01480 447700 Fax: 01480 431767
Owner’s Manual
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QUAD twenty four P Owner’s Manual QUAD twenty four P Owner’s Manual
INFORMATION TO THE USER
Good Practice
Switch off all equipment in the system before connecting or disconnecting
signal leads. This will prevent unpleasant and loud noises coming from
the loudspeakers and avoid the risk of damage to equipment.
Please be aware that high sound pressure levels can cause permanent
damage to your hearing and severe annoyance to neighbours.
Guarantee and Product Registration
Your Quad equipment is guaranteed against any defect in material and
workmanship for one year from the date of purchase (proof of purchase
required). We ask that you complete and return the enclosed Warranty
Registration Form. Within the guarantee period, Quad will undertake
replacement of defective parts free of charge provided that the failure was
not caused by misuse, accident or negligence. Your statutory rights
within the territory in which you purchased the equipment are not
affected by this guarantee.
Quad carries out a regular review of its products and reserves the right to
adjust the specifications and performance from time to time.
There are no user replaceable or serviceable parts inside this unit.
Unauthorised attempts to service or modify this product will invalidate
the warranty.
Service Arrangements
Equipment for servicing should be returned to the supplying dealer, or to
the appointed service agents for your area. The addresses of Service
Agents for the UK, USA and Canada are listed at the rear of this manual.
If you are abroad and there is no suitable dealer in your area, please
contact the distributor for the country in which it was purchased or
Quad Electroacoustics Ltd.
Equipment returned for service should use the original packing. Please
enclose a brief note with your name and address and the reason for
returning the unit.
Running In
Most high fidelity equipment works better after it has been run in for
some time. In the case of valve equipment the period of running in is
much more important. Components that go into valve equipment work
at voltages and temperatures far higher than their solid state counterparts
and when new they should spend an extended period at those working
temperatures to bed in properly. This is especially the case with power
amplifier output valves and output transformers.
We recommend an initial running in period of at least four and
preferably twelve hours before you first use the equipment.
The patience and care that you devote in these initial stages will be amply
rewarded by many years of outstanding performance from your QUAD
valve equipment.
Care and Cleaning
The equipment should be switched off and allowed to fully cool down
before being cleaned with a barely damp cloth. Avoid using solvents and
abrasives as they will damage the paint finish. Dry fully before re use.
OPERATION
Switching On
! The mains switch c on the QUAD twenty four P is a 'push ON
push OFF' type. When the switch is depressed power is applied,
when released, the power is switched off.
! The volume control b is a rotary type. Turn this fully anticlockwise
to its minimum setting (0).
! Switch on the power amplifier (and control unit if used).
! Switch on the QUAD twenty four P via the ON/OFF switch b The
mains indicator will light and the unit is operational.
Warming Up
Valve equipment needs time to reach operating temperature. Allow at
least five minutes for the QUAD twenty four P to 'warm up' before use.
Warming up should always be done with the system volume control at
zero. If you are using a valved power amp the warming up period should
be extended to at least fifteen minutes.
If you play loud music while the system is cold the valves will be starved of
both voltage and current. The resulting distortion is unpleasant and
potentially damaging to your amplifier and speakers.
Operation
Normal Operation: After it has warmed up fully, the system is ready for
use. Remember to turn the main system volume control to minimum
when changing records, and especially when cleaning your stylus.
Adjusting Sensitivity: Adjustments to sensitivity may be carried out with
the unit operational only if the system volume control is first set to
minimum. Turn up the volume control only after adjustment.
Switching Off: When not in use the unit should be switched off.
Using the QUAD twenty four P as a Control Unit
If there is sufficient gain in the power amplifier, the QUAD twenty four P
can be used as a control unit in a basic audiophile system comprising a
turntable, power amplifier and loudspeakers. To do this, connect the
VARIABLE output of the QUAD twenty four P directly to the power
amplifier signal inputs. If the power amplifier has an input level control
this should be advanced to maximum as the volume control on the
QUAD twenty four P will now function as the system volume control.
Volume
Control
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On/Off
Switch
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