Monobloc Valve Power Amplifier
Contents
1. least fifteen minutes for the amplifiers to warm up before use Valve amplifiers need time to reach their correct operating temperature If you play loud music while the system is cold the output valves will not be fully operational and the amplifier will be starved of both voltage and current The resulting distortion is unpleasant to listen to and potentially damaging to the amplifiers valves and your loudspeakers Intensive use of the equipment before it has warmed up will also shorten valve life2. 16 at 1 kHz referred to 8 Ohms 240VA maximum 2 x 6SL7 1 x 6SN7 4x KT88 QUADIH eighty Manual 0405 Issue 1 Al w QUAD II eighty Valve Lifetimes The valves in the Quad II ezghty will perform to specification for years if used properly Valves contain a heating element This heats up the valve s cathode which is coated to give off a steady stream of electrons After a few years this coating will begin to wear out and performance will gradually deteriorate In the QUAD II ezghty amplifier the KT88 output valves are likely to deteriorate first but the driver valves will also eventually wear out As the valves start to wear out the sound will become less well defined and a lack of dynamics and power will become evident Replacing the valves with a new set will fully restore the audio performance of the amplifier When replacing valves it is essential to use the highest quality available Poor quality valves will adversely affect the sound quality and may in extreme cases damage the amplifier When replacing the output valves use matched sets for best results Do not leave the amplifiers permanently switched on or you will seriously shorten the lifespan of your valves Output Transformer After installing or changing the wiring to your speakers keep the volume control at zero let the amplifier warm up and turn up the main volume gradually If you don t hear sound switch off immediately and investigate The output transformer is the most
3. QUAD QUAD I eighty Monobloc Valve Power Amplifier QUAD I eigr y gt Quad Electroacoustics Ltd IAG House W ner S Manual Sovereign Court Ermine Business Park Huntingdon PE29 6XU England www quad hifi co uk Tel 01480 447700 Fax 01480 431767 Important Safety Precautions Please Read Carefully CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER OR BACK NO USER REMOVEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED PERSONNEL ADVERTISSEMENT RISQUE DE CHOC ELECTRIQUE within this unit NE PAS OUVRIR 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 wider 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 Protec
4. als should never be used as they may damage the paint finish GUARANTEE AND PRODUCT REGISTRATION Your QUAD equipment is guaranteed against any defect in material and workmanship for a period of one year from the date of purchase with the exception of the valves which are warranted for three months Proof of purchase is required for warranty claims Please complete and return the enclosed Warranty registration form Within the warranty 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 warranty 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 equipment Unauthorised attempts to service or modify this product will void the warranty QUAD II eighty USER GUIDE QUAD Il eisrry INTRODUCTION PRELIMINARIES INSTALLATION QUAD Il eighty The QUAD II eghty power amplifier is the latest of a series of outstanding valve amplifiers based on the legendary QUAD II amplifier designed by Peter Walker the founder of QUAD and one of the guiding lights of early Hi Fi reproduction To cater for modern requirements the amplifier has been upscaled to provide a power output of 80 Watts Altho
5. er about converting the unit The fuse rating should be 220 240V UK Korea etc T1 5AL 20mm Slow Blow 100 120V USA Japan etc T4AL 20mm Slow Blow QUAD I eisrry If this is your first valve amplifier please familiarise yourself with some important issues surrounding the safe use of the QUAD LI ezghyy Valves Get Hot Valve power amplifiers generate a lot of heat even with no input so it is vital to ensure adequate ventilation for your power amplifiers QUAD II ezghty power amplifiers should not be placed on a rack each unit should be on a stable solid well ventilated surface with at least Im 3ft of free space above Although the protective cage over the QUAD II ezghty gets hot it is very unlikely to cause a burn For absolute safety the units should be placed out of the reach of children and pets and away from heat sensitive objects Valve Amplifiers Work at High Voltages Do not open any of the cases Ensure that nothing is poked dropped or poured into an amplifier s case The environment should be dry and free from litter Do not place magnetically or thermally sensitive objects i e credit cards close to these QUAD units Valves are Microphonic Valves are constructed with glass fine wires and tiny metal parts If you place the power amplifiers too close to the speakers the valves may vibrate at high sound levels 1 metre 3ft to the side of each speaker is a sensible minimum operating distance Interconnects and Cabl
6. es The signal input to the amplifier is via an RCA phono connector As valve equipment wotks at high impedances the phono interconnect from the pre amplifier should be screened and of a low noise low capacitance construction To minimise capacitance and other effects signal interconnects should be kept as short as possible Choose good quality loudspeaker cable designed for the purpose rather than general purpose zip or bell wire It should be of adequate gauge to maximise bass performance CONNECTIONS Before connecting your amplifiers unplug all active components in the system Com 80 49 Design by Fim de Paravicini On 220V 50Hz T1 5AL Fuse DO N DT REMOVE 1 4E COVER QUAD ELECTROACOUSTICS L1D 100V 50 6L _ T4AL Fuse NO U 5ER SERVICE BLE PARTS INSIDE i M On Off Fused IEC 80 4a Common Audio Switch Mains Input Loudspeaker Terminals Input Connections The QUAD II eghty must be connected to a line output which has a variable volume control Decide which of the two power amplifiers is to be the left channel and which the right channel Using an appropriate screened RCA phono cable connect the input socket of each QUAD II ezghfy amplifier to the requisite line output socket of the pre amplifier The input interconnects to the power amplifiers should be the same length When running signal cables keep them away from sources of interference Do not run signal cables parallel to cables carrying ma
7. expensive component in a valve power amplifier It is designed to match the high voltage low current conditions in which output valves operate to the low voltage high current requirements of a loudspeaker Although robust and capable of lasting a lifetime an output transformer can be damaged and in extreme cases wrecked by careless use If you play a valve amplifier into a short circuit the output transformer will soak up a lot of energy before failing but if the short persists the transformer could be damaged Remember operating a valve amplifier at high output levels with vo loudspeaker connected can also damage an output transformer Overall Volume Levels Always turn the volume control down before changing sources as the resulting surge could damage your loudspeakers Output levels from different source components in a high fidelity system can vary widely A CD player can produce levels significantly higher gt 18 dB than an FM tuner It follows that the position of the volume control is not a guide as to how loud the equipment will go Though the overload characteristics of the QUAD II ezghty are such that you will be able to play your music at surprisingly high levels if the sound 1s distorted you are overloading your equipment whatever the position of the volume control CARE AND CLEANING The surface of the equipment may be cleaned with a damp cloth provided that the power has been removed first Solvent based cleaning materi
8. ins or digital traffic Loudspeaker Connections 1 Strip any outer sleeve from the cable to a depth of around 40 mm 1 5 Strip the top 7mm of sleeving to expose the bare wire If you are using stranded cable lichtly twist the strands to gather any loose ends Partially unscrew the knurled portion of the terminal to expose the cross hole at the terminal base Push the bare end of the cable into the hole Ensure that the polarity is correct and there are no loose strands which could touch adjacent terminals Tighten securely QUAD Il eisrry Loudspeaker Connections 2 The QUAD II eighty has three output terminals Common 4 Ohms and 8 Ohms Check the manufacturer s handbook for your speakers and use the terminal pair that most closely matches your speakers Even though a loudspeaker may be rated at 8 Ohms or 4 Ohms its impedance varies with frequency some experimentation may be necessary For loudspeakers with nominal impedance of 7 Ohms and above TQ 160 e Connect the Red Positive terminal of the loudspeaker to the 8 Ohm terminal e Connect the Black Negative terminal of the loudspeaker to the COM terminal of the QUAD II eighty amplifier For loudspeakers with nominal impedance between 3 and 6 Ohms e Connect the Red Positive terminal of the loudspeaker to the 4 Ohm terminal e Connect the Black Negative terminal of the loudspeaker to the COM terminal of the QUAD II eighty amplifier Some basic cautio
9. modifications not expressly approved by the manufacturer could void the uset s authority to operate this device Warning The mains power switch for this appliance is located on the side panel To permit free access to this switch the apparatus must be located in an open area without any obstructions IMPORTANT NOTICE TO UK USERS The appliance cord is terminated with a UK approved mains plug fitted with a 10A fuse If the fuse needs to be replaced an ASTA or BSI approved BS1362 fuse rated at 10A must be used If you need to change the mains plug remove the fuse and dispose of this plug safely z mediately after cutting it from the cord Connecting a Mains Plug The wires in the mains lead are coloured in accordance with the code Blue NEUTRAL Brown LIVE Green and Yellow Earth As these colours may not correspond to the coloured markings identifying the terminals in your plug proceed as follows The BLUE wire must be connected to the terminal marked with the letter N or coloured BLUE or oe BLACK The BROWN YELLOW wire must be connected to EARTH the terminal marked with the letter L or coloured BLUE BROWN or RED The NEUTRAL GREEN amp YELLOW wire must be connected to the terminal marked with the letter E or coloured GREEN or GREEN amp YELLOW or marked with the Earth Symbol SERVICE amp INFORMATION If your QUAD equipment requires servicing including valve replacement you should return it to the dealer f
10. ns e NEVER drive loudspeakers using the 4 and the 8 Ohm terminals together e NEVER short any terminals out e NEVER connect or disconnect loudspeaker cables whilst the QUAD II ezghyy is switched on OPERATION e Ensure that the mains switches on the power amplifiers are switched OFF and that the pre amplifier volume control is at minimum e Connect the IEC mains leads from the wall sockets to the mains inputs on each amplifier e Plug in the mains leads to the other units Switch on the power at the wall e Switch on the power amplifiers and other source units e Allow the amplifiers to warm up before use see below Warming up or running in should ahvays be done with the volume control at zero e After use always switch the power amplifiers off Running In New Equipment With valve amplifiers running in is very important Valve components work at high voltages and temperatures and when new they should spend an extended period at those temperatures to bed in We recommend a running in period of at least four and preferably twelve hours before you first use the equipment If you decide to run in your equipment for this extended period make doubly sure that all the safety conditions covered in this manual are fully met Supervise the equipment for the first hour or so and if you have to leave the equipment unattended thereafter have someone look in every so often to make sure all is well Warming Up Before Use Allow at
11. rom whom the equipment was purchased 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 It is user s responsibility whether the equipment is under warranty or otherwise to ensure that equipment for service is returned carriage paid and in the original packaging You should enclose a brief note with your name and address and the reason for returning the equipment Authorised QUAD Service Centres in the U K and North America USA Taiga LLC 310 Tosca Drive Stoughton MA 02072 Tel 781 341 1234 Fax 781 341 1228 Email service taigallc com For information on authorised service centres worldwide contact QUAD Electroacoustics Ltd A worldwide distributor list is available on the QUAD website www quad hifi co uk SPECIFICATIONS QUAD II eisrty Monobloc valve power amplifier Input sensitivity nom Power output Output Impedance THD at 80 Watts Residual hum and noise Frequency response Damping factor Power consumption Valves 4h wy QUAD I eisrty U K QUAD Electroacoustics Ltd IAG House Sovereign Court Ermine Business Park Huntingdon Cambs PE29 6XU Eneland Tel 44 0 1480 447700 Fax 44 0 1480 431767 1V RMS for full output 80W RMS 4 Ohms or 8 Ohms selectable 0 2 1kHz 0 5 30Hz to 15Khz 1 0 20 to 20 Khz Better than 94 dB 10 Hz to 30 KHz 0 0 5 dB 3Hz to 50 Khz 3dB
12. t 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 When a cart is used use caution when RN TA g m 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 ot has been dropped manufacturer or sold with the apparatus This symbol indicates that there are important operating and maintenance instructions in the literature accompanying this unit This symbol indicates that dangerous voltage constituting a risk of electric shock is present 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 Caution Changes or
13. ugh certain aspects of the original amplifier have had to be changed the fundamentals are essentially as they were when the original Quad II first saw the light of day over fifty years ago The QUAD II eighty 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 predecessors it will be a treasured possession for you and for future generations of music lovers Although this equipment has primarily been designed for use with QUAD components it may be connected to any high quality audio source component and loudspeaker system The QUAD II aghty amplifier carton contains QUAD II eighty valve power amplifier One IEC mains lead fitted with an appropriate mains connector Instruction Manual and Warranty Registration form One set of packing materials Consult the dealer from whom you purchased the equipment if any item is missing Please retain the packing materials for future transportation of the product Please read this manual in full before installing your new amplifier and retain the manual and your purchase receipt for future reference The mains operating voltage of the unit is indicated on the rating plate attached to the unit If this voltage does not match the mains voltage in your area consult your QUAD deal
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