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Preamplifier

1. Caution Changes or modifications not expressly approved by the manufacturer could void the user s authority to operate this device This symbol indicates that there are important operating and maintenance instructions in the literature accompanying TO REDUCE THE RISK OF ELECTRIC SHOCK this unit DO NOT REMOVE COVER OR BACK i NO USER REMOVEABLE PARTS INSIDE This symbol indicates that REFER SERVICING TO QUALIFIED PERSONNEL dangerous voltage constituting a risk of electric shock is present within this unit MAIN SERVICE CENTRES IN THE UK USA AND CANADA USA IAG America Inc 15 Walpole Park South Walpole MA 02081 Tel 1 508 850 3950 CANADA Korbon Trading Ltd 6800 Kitimat Road Units 19 20 Mississauga Ontario Tel 1 905 567 1920 U K QUAD Electroacoustics Ltd IAG House Sovereign Court Ermine Business Park Huntingdon Cambs PE29 6XU England Tel 44 0 1480 447700 Fax 44 0 1480 431767 www quad hifi co uk QUAD twenty four P Owners Manual SPECIFICATIONS QUAD twenty four P Phono preamplifier Valve complement THD Frequency Response RIAA TEC equalisation Hum and Noise mm position input shorted Input Impedance Moving Magnet Moving Coil Stage gain High Sensitivity Medium Sensitivity Low Sensitivity Nominal Output Level ref 5 2mV MM Low Inputs Outputs Power Consumption COMPLIANCE 4x6I11 0 0890 A weighted 20Hz to 20kHz 0 5
2. cleaned with a barely damp cloth Avoid using solvents and abrasives as they will damage the paint finish Dry fully before re use QUAD twenty four P Owner s Manual OPERATION Volume On Off Control Switch QUAD teeny fre P uy Switching On e The mains switch 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 e The volume control is a rotary type Turn this fully anticlockwise to its minimum setting 0 e Switch on the power amplifier and control unit if used e Switch on the QUAD twenty four P via the ON OFF switch 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
3. 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 QUAD twenty four P Owners Manual QUAD twenty four P Owner s Manual IMPORTANT SAFETY INFORMATION Read these instructions Keep these instructions Heed all warnings Follow all instructions Do not use this apparatus near water Clean only with dry cloth Do not block any ventilation openings Install in accordance with the manufacturer s instructions Do not install near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat Do not defeat the safety purpose of the polarized or grounding type plug A polarized plug has two blades with one wid
4. purity Noise in the Moving Coil stage is kept to extremely low levels by the use of an ingenious matching transformer which adds no sonic fingerprint while maximising dynamic range and headroom The styling of the QUAD twenty four P is classic QUAD and matches the QC twenty four and the QUAD II forty The QUAD twenty four P is 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 valved contemporaries and predecessors it will be a treasured possession for you and for future generations of music lovers QUAD twenty four P Owners Manual Cartridge Selection MC uiia mm l Input Sensitivity Med Low High Final Connections Variable Output The variable output is intended exclusively to connect the Quad twenty four P directly to the input of a power amplifier For more information see the next page If you are connecting the Quad twenty four P to a preamplifier or an integrated amplifier with its own volume control do not use this output as you will be duplicating the system volume control unnecessarily The Quad twenty four P accepts virtually all magnetic and moving coil cartridges currently available Two input settings are provided Pressing the mm mc selector button sele
5. 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 twenty four P Valve Phono Preamplifier Owners Manual QUAD twenty four P Owners 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 produc
6. cts moving coil mc cartridges releasing the button selects moving magnet cartridges Use the mm position for e Standard moving magnet cartridges e High output moving coil cartridges read the manufacturer s guide e Low output moving coil cartridges connected via step up devices e g a m c cartridge with its own transformer Use the mc position for e Standard low output moving coil cartridges only Note Low output moving coil cartridges are very low impedance devices If you play a moving magnet cartridge with the selector set to mc you will get huge amounts of distorted sound with virtually no treble If you do the reverse the output will be very low and somewhat shrill Use the selector switch to select the appropriate sensitivity Three levels of sensitivity are available high medium and low These positions affect the amount of amplification gain in the circuit The low sensitivity setting provides the least gain and so on mm position Most modern moving magnet cartridges around 4mV will require medium or high sensitivity Some older mm cartridges may need the low setting High output moving coil cartridges 2mV or less which require the mm input will need the high sensitivity setting mc position Moving coil cartridge outputs vary widely If your cartridge has an output of 250pV or less you will probably need high sensitivity Note Setting the sensitivity is a balance between noise and headroom If the sensi
7. dB Better than 60 dB 47kQ 10Q 1 3mV MM 130uV MC 2 6mV MM 260uV MC 5 2mV MM 520uV MC 1 0 V Selectable MC MM cartridge 1 x Fixed line level 1 x Variable line level 15 VA maximum This Quad product complies with the relevant clauses enshrined in the following standards and directives in force at the time of the introduction of the product EU Directives 89 336 EC 72 23 EEC Safety EN60065 CB Scheme Emissions EN55013 EN61000 Immunity EN55020 2002 USA UL 6500 2002 CANADA CAN CSA E60065 00 Manual Quad 24 P Phono 09 04 Issue 2 QUAD twenty four P Owner s Manual QUAD twenty four p Owners Manual ONUA er fe p The QUAD twenty four P is a dedicated phono cartridge preamplifier of impeccable performance Styled to match the QC twenty four pre amplifier the QUAD twenty four P will partner any high performance line level pre amplifier In addition the dedicated vinyl lover will find that this eminently musical and elegant pre amplifier provides the ideal upgrade path to an enhanced listening experience With provision for moving coil and moving magnet cartridges this versatile unit caters for all modern types of pickup cartridge and its extremely low noise and wide stable bandwidth will bring out the best in your record collection The QUAD twenty four P uses a functionally simple audio circuit featuring low noise valves to preserve signal
8. en to the NEUTRAL terminal e The Green Yellow wire must be taken to the EARTH terminal In the UK a fused 13 Amp mains plug should be fitted with a fuse link rated at 5 Amps In other countries a value between 10 and 15 Amps should be used at either the wall socket or the mains distribution board The power supply input to your QUAD equipment is via an IEC mains connector and an appropriate mains lead is supplied For optimum performance each unit should be connected to a properly installed mains power socket If you need to use a mains distribution unit please ensure that it is a safety approved unit of appropriate rating and that it is used exclusively to supply audio components This QUAD component must be connected to an earthed grounded AC supply If you are uncertain if the mains supply in your house is efficiently earthed you should consult a qualified electrical engineer QUAD twenty four P Owners Manual Connecting the QUAD twenty four P Fused IEC Preamp Input MM MC Phono Input Mains Input Outputs Sensitivity Selector Signal Ground Output Variable Fixed L e r se o 220V 50Hz T100mAL Fuse DO NOT REMOVE THE CASE QUAD ELECTROACOUSTICS LTD 100V 60Hz T200mAL Fuse NO USER SERVICEABLE PARTS INSIDE HUNTINGDON CAMBS PE29 6XU UNITED KINGDOM When making stereo connections to the QUAD twenty four P RCA plugs and sockets coded white or black usually indicate the LEFT c
9. er than the other A grounding type plug has two blades and a third grounding prong The wider blade or the third prong are provided for your safety If the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet Protect the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the apparatus Use only attachments accessories specified by the manufacturer Use only with a cart stand tripod bracket or table specified by the manufacturer or sold with the apparatus When a cart is used use caution when moving the cart apparatus combination to avoid injury from tip over Unplug this apparatus during lightning storms or when unused for long periods of time Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way such as power supply cord or plug is damaged liquid has been spilled or objects have fallen into the apparatus the apparatus has been exposed to rain or moisture does not operate normally or has been dropped Warning To reduce the risk of fire or electrical shock do not expose this product to rain or moisture The product must not be exposed to dripping and splashing and no object filled with liquids such as a vase of flowers should be placed on the product No naked flame sources such as candles should be placed on the product
10. hannel and those coded red the RIGHT channel In a stereo pair of sockets the upper socket is usually the Left Channel and the lower socket the Right If you are in any doubt consult a qualified dealer Connecting a turntable tonearm Before connecting your units please read the instructions that came with your pickup cartridge turntable and tonearm Ensure all active units in your system are switched off and unplugged Signal connections Most turntable tonearms come with captive phono cables If your turntable has phono sockets you will need a stereo RCA cable refer to Page 3 Connect the turntable phono outputs to the Phono Signal Inputs 9 Push the plugs firmly into place to make secure contact Ground Connections Most turntable tonearm combinations use a ground wire some use separate ground wires for turntable and tonearm If your turntable has phono socket outputs you may need as a ground wire a single length of stranded wire the same length as the signal cables Connect the ground wire s to the Input Ground terminal Unscrew the ground terminal part way and insert the spade connector under the terminal If the cable does not have a spade connector bare a short length of wire and insert this under the left side of the terminal Tighten firmly Note 1 Some turntables do not have a ground wire but have a cartridge negative return lead connected internally to the turntable tonearm chassis Note 2 Some cartridges have a negati
11. peakers and subwoofers Valves are susceptible to hum and noise pickup Keep them away from domestic appliances and other sources of interference Audio connectors and cables Audio cables used with this Quad equipment should be of low noise construction fully screened to minimise hum induction and properly terminated with high quality RCA phono connectors Cables should be kept short to minimise hum and noise If a cable is too short do not use an extension purchase a new cable Keep audio input cables physically separated from mains cables and equipment power supplies Never run audio cables parallel with or close to mains cables QUAD twenty four P Owners Manual If you use high capacitance cable to connect a moving magnet cartridge to a pickup input you may cause an audible peak in the high frequency response If you are in any doubt consult your dealer Positioning the pre amplifier The pre ampifier should ideally be placed on a rigid shelf separate to the turntable If however you do place the pre amplifier beside the turntable place it to the right This will keep the turntable motor and the mains transformer of the QUAD twenty four P apart and the tonearm output and signal input of the pre amplifier together The QUAD twenty four P may be placed in an equipment rack but ensure that there is ample free space around the unit for good ventilation and to minimise hum induction from other units Checking the AC power s
12. t 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
13. thene bag carefully taking care not to damage the paint surface Retain the packing materials for future use or return them to your dealer If you decide not to keep the packing please dispose of it sensibly The paper and plastics are recoverable and may be taken to an appropriate recovery service Please retain the user manual and the information concerning the date and place of purchase of this equipment for future reference If you transfer this equipment to a third party please ensure all the instructions are passed on with the product General Notes on Valve Equipment If this is your first valve equipment please familiarise yourself with some issues surrounding the safe use of the QUAD twenty four P Valves get hot Valves tubes function by thermionic emission which requires heat Ensure adequate ventilation for your valve equipment and keep it away from thermally sensitive objects Valve amplifiers work with high voltages The voltages present within this component are far higher than with solid state equipment Do not open the case and ensure that nothing is poked dropped or poured into it Valves are microphonic Because valves are constructed from fine wires and tiny metal parts they can pick up external vibrations For that reason a good solid isolation support is recommended Because the greatest gain in the system is from the QUAD twenty four P keep it away from sources of vibration and out of the firing line of louds
14. tivity is too high headroom is lowered if the setting is too low noise performance may be compromised The QUAD twenty four P has outstanding headroom performance so there is no need to be over cautious with the sensitivity setting Read the instructions that came with your cartridge and consult your dealer for advice if you are in any doubt e Check that all the connections to the system are properly made e Turn the main system volume control to its minimum setting e Connect the IEC socket on the supplied power cord to the mains socket on the QUAD twenty four P e Connect the power plug into the mains socket e The unit is now ready for operation QUAD twenty four P Owner s Manual PRELIMINARIES The packaging contains the following items Unpacking the unit INSTALLATION e One QUAD twenty four P phono preamplifier e One IEC mains lead fitted with an appropriate mains connector for UK this is QUKES2B for Europe this is QE2P2S2 for USA Canada Japan and Korea this is QU3ES2C for other territories an appropriate cable will be supplied e Instruction Manual e Warranty Registration Form e One cardboard carton and packing materials Consult the supplying dealer if any of these items are not present Open the carton and remove the top packing pieces Lift the unit out taking care not to damage the cabinet DO NOT attempt to lift the apparatus out of the carton using the polythene bag Remove the poly
15. upply Fuses The QUAD twenty four P is supplied in versions suitable for connection to 230V 220V 115V or 100V AC power supplies Before connecting the unit check that you have the correct version Before connecting to the AC power supply check that the voltage range marked on the back panel corresponds with that of the supply Please check with the dealer if you have any doubt as to the voltage in your area or intend to use the equipment in regions which use other mains voltages The mains supply fuse is accessible on the rear panel after the IEC mains plug has been removed In the rare event that it has broken you should check for any obvious cause before replacing the fuse with one of the correct rating and type The correct fuse values are 220 240V UK Korea etc T100mAL Slow Blow 5x20mm 100 120V USA Japan etc T200mAL Slow Blow 5x20mm You should switch off the equipment and remove the connection to the mains power outlet before changing the fuse Connecting to the AC power supply QUAD equipment supplied in Europe is provided with a mains cable fitted with an appropriate mains plug This plug should not be cut from the cable or used with its fuse cover removed If for any reason the plug is removed it must be safely disposed of It must never be re used e A replacement plug should be wired to the supplied mains cable as follows e The Brown wire must be taken to the LIVE terminal e The Blue wire must be tak
16. ve signal pin linked to a metal cartridge body If the cartridge body contacts the tone arm metalwork via the connecting hardware this may cause a hum loop Consult your dealer before you remove this link Connecting the QUAD twenty four P to the control unit Fixed Output This is the default output and should be used for all connections to a preamplifier Using a suitable RCA phono cable connect the FIXED output sockets to a suitable ive or auxiliary input on the control unit Push the plugs firmly into place to make secure contact In the case of the QC twenty four do NOT connect the ground terminal of the Phono input to the ground terminal of the Quad twenty four P

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