Arcam A60 User's Manual
Contents
1. C D input auxiliary output socket not applicable to model When a Compact Disc player is not plugged into the C D input auxiliary output socket then a two head cassette or reel to reel tape recorder may be connected to this socket A two head machine is one without monitoring ie replay while recording facilities To record the tape button is left in the out position and the signal to be recorded is selected by pushing either the disc or tuner button The selected signal will be sent to both the recorder at 15k ohm impedance and to the loudspeakers The signal should be routed to the line inputs outputs of the recorder which are usually accessed via phono sockets DO NOT PUSH THE C D BUTTON WHILE THE RECORDER IS SWITCHED INTO RECORD MODE AS THIS MAY CAUSE A FEEDBACK WHISTLE It is not possible to record from the tape input If it is desired to record from a reel to reel tape recorder onto cassette then the reel to reel tape recorder should be plugged into the tuner socket and the tuner button pushed To record in mono on either mono stereo recorder push in the mono button before starting to record N B None of the amplifier controls apart from the input selector switches affect the signal being recorded To replay via the C D socket switch the recorder to play mode and push the C D button The signal from the tape wil2. SIE E E 3 i INN HLL i 0 01 1 2 5 10 203050 OUTPUT POWER WATTS 12 Guarantee for UK sales This equipment has been fully tested before despatch from the factory Both the workmanship and the performance of this equipment are except as set out below guaranteed against defects for a period of two years from the date of purchase provided that it was originally purchased new from an authorised UK dealer under a consumer sale agreement The words consumer sale on construed in accordance with Section 15 of the Supply of Goods Implied Terms Act 1 The Manufacturers can accept no responsibility for defects arising from accident misuse wear and tear or neglect or through unauthorised adjustment and or repair neither can they accept responsibility for damage or loss occurring during transit to or from the person claiming under this guarantee This guarantee covers both labour and parts but the liability of the Manufacturers is limited to the cost of repair or replacement at the discretion of the Manufacturers of the defective parts and under no circumstances extends to consequential loss or damage Claims under this guarantee This equipment should be packed in the original packing and returned to the dealer from whom it was purchased or failing this any other authorised A amp R Cambridge dealer If it is not possible to return the equipment by hand then it should be sent carriage prepaid
3. A amp R Cambridge Ltd Contents Introduction Installing and using your A60 Back panel connections Front panel controls Tape recording Technical details Spares kit Connector wiring Fuses Removal of wooden cover Cartridge loading modules MC60 moving coil pre amplifier System block diagram Specification Inputs Outputs Performance Typical performance graphs Guarantee for UK sales O 1 1 1 Introduction The A60 integrated stereo amplifier has been designed to provide high quality sound reproduction and to blend unobtrusively with domestic surroundings The amplifier has four switchable inputs accepting signals from a turntable fitted with a moving coil or magnetic cartridge a tuner a Compact Disc player and either a cassette or reel to reel tape recorder It provides outputs for a pair of loudspeakers and for headphones and low level signals suitable for recording on to cassette and open reel tape Additionally in the pre and power amplifier sections may be split to permit more complex systems e g using ambisonics to be assembled Although designed for simplicity of operation A60 has comprehensive tone control facilities which enable good results to be obtained with a wide variety of programme material Please study the manual carefully to ensure that you get the best results from your amplifier Remember your dealer is there to help you He has full technical a
4. by a reputable carrier Should the original packing not be available replacement packing can be purchased from the Manufacturers The equipment should not be sent by post DO NOT CONSIGN THE EQUIPMENT TO A amp R CAMBRIDGE UNLESS YOU HAVE FIRST BEEN SPECIFICALLY REQUESTED TO DO SO BY THE MANUFACTURER S TECHNICAL SERVICE DEPARTMENT DO NOT UNDER ANY CIRCUMSTANCES ATTEMPT TO DISASSEMBLE THE EQUIPMENT BEFORE DESPATCH If you have any difficulty complying with these requirements please contact the Manufacturers at the following address A amp R Cambridge Limited Pembroke Avenue Denny Industrial Centre Waterbeach Cambridge CB5 9PB Tel 0223 861550 Telex 817345 ARCAM In either case you should state clearly your name and address the date and place of purchase together with a brief description of the fault experienced In the event of equipment being returned which on test is found to comply with the published specification the Manufacturers reserve the right to charge a reasonable fee for testing the equipment and for return carriage Enquiries The Manufacturers are happy to answer any queries you may have regarding the use of this equipment on the condition that this enquiry is by letter and a stamped addressed envelope is provided You should state clearly the serial number of the unit the dealer from whom it was purchased and the date of purchase THIS GUARANTEE IN NO WAY VARIES OR REMOVES A PURCHASER S ST
5. left hand speaker and the lower set for the right hand speaker One side of your speaker normally the side should be connected to the black terminal the other the side may be connected either to the red direct or to white switched terminal When the direct output is used loudspeakers and headphones may be used together when the switched output is used insertion of a jack plug into the headphones socket will automatically mute the loudspeakers The AGO is unconditionally stable and suitable for use with all types of loudspeaker leads including the high definition types Heat sink The heat produced by the amplifier is dissipated into the air by the heat sink which will along with the surrounding panel become warm while the amplifier is on The whole back panel may become quite hot if the amplifier is run near full power THIS IS PERFECTLY NORMAL if it becomes too hot to touch switch off the amplifier at once and consult your ealer Disc input The output lead from your turntable should be plugged into the disc input sockets To prevent hum pick up in this very sensitive input the cable must be screened and kept well away from mains wiring If the turntable has a separate earthing lead connected this should be attached firmly to the amplifier s ground terminal The disc input is normally suited to moving magnet or high output moving coil cartridges If a low output moving coil
6. procedure Cartridge loading modules These are purely passive modules designed to modify the input impedance of the amplifier in order to obtain the best match with the cartridge in use The ULM M is designed for use with moving magnet cartridges and the ULM C to be used in conjunction with the MC60 pre amplifier board is for use with moving coil types Each is user adjustable via switches on the magus and offers the facility for additional components to be wired on to provide customised oads The loading module should be plugged into the A60 in the position shown in the diagram opposite DO NOT OPERATE THE LOADING MODULE SWITCHES WHEN THE AMPLIFIER IS SWITCHED ON THIS MAY DAMAGE YOUR AMPLIFIER OR YOUR LOUDSPEAKERS It must be emphasised that these passive modules mainly affect the sound balance and frequency response They will have little or no effect on the sensitivity of the amplifier except with some moving coil cartridges where lower resistance loadings may reduce the cartridge output significantly necessitate a higher volume control setting Most cartridges will perform satisfactorily without any loading module MC60 moving coil pre amplifier The MC60 is designed for use with a wide range of low output moving coil cartridges Its input impedance is adjustable by using the ULM C module as described above To install the 60 the following procedure should be followed 1 Switch off and disconnect the mains supp
7. required the DIN shorting plug supplied with the should be inserted into the AP socket as this links the pre and power amplifiers together so that the unit functions as a standard 60 Tape input output The tape input is designed to suit most cassette and reel to reel tape recorders and provides both input and output with A B monitoring facilities see page 6 Front panel controls filter mono volume treble bass balance LED indicator tuner tape monitor control contro control control headphones mains switch socket input selectors Mains power The amplifier is turned on by the mains power switch see illustration It is good practice to turn the amplifier off when it is not in use LED indicator light This indicates that the d c power supply in the amplifier is operating It will continue to glow for a short time after the amplifier has been switched off as the d c voltage decays Input selection The disc tuner and C D switches are used to select the programme routed to the loudspeakers By pushing any one of these buttons you will cancel the previous setting DO NOT attempt to push more than one button at same time Tape monitoring facility The tape monitor switch is generally left in the off position switch out so that the programme selected by the input switches is routed to the loudspeakers When the tape button is pushed the recorded signal from the tape r
8. 0dB Gain to Loudspeaker terminals 29dB phase non inverting Tone controls Treble up to 8dB at 15kHz Bass up to 8dB at 50Hz High Filter turnover frequency 7 5kHz slope 12dB octave Bessel linear phase characteristic Outputs Tape Nominal output level 100mV Output Impedance 5kQ Tape monitor switch allows instant A B monitoring 10 Auxiliary Nominal output level as Tape output Output Impedance 15 Pre amplifier AGOAP only Nominal output level 600mV Maximum output before clipping 1 8V rms Noise lt 80dB Distortion at nominal output level lt 0 03 20Hz 20kHz Output Impedance 5000 Headphones Nominal output level no load 6 5 V rms Output Impedance 1300 Suitable for headphones of 80 2kO impedance Loudspeakers Nominal output level 35 watts into 80 at 1kHz Low frequency damping factor gt 50 Performance Power output amp distortion Both channels into 80 40W at 0 2 THD 20Hz 20kHz 1kHz output at 0 2 THD with one channel driven is typically 50W into 80 70W into 40 IHF burst power into 80 typically 60W 40 typically 90W 1kHz THD lt 0 08 at any level up to 35W 8Q typically lt 0 03 at 35W Frequency response Disc see input facilities Other Inputs 20Hz 20kHz 0 5 1dB reference 1kHz output falls continuously beyond these limits Crosstalk lt 65dB at 1kHz Protection Short term delayed V I electronic protection Long term 1 6A 20mm x 5mm quick blow
9. ATUTORY RIGHTS Printed in England by Clanpress King s Lynn Ltd Issue 6 1986 For Serial Nos 25 500 onwards Errors and omissions excepted ASE CAMBRIDGE Sound Reliability A amp R Cambridge Ltd Pembroke Avenue Denny Industrial Centre gt Waterbeach Cambridge CB5 9PB England Tel 0223 861550 Telex 817345 ARCAM G
10. able for use with two head machines It is intended to be connected to the line inputs outputs of these machines which are usually accessed via phono sockets To record the programme source is selected by the disc the tuner or the C D button This programme will automatically be sent to the recorder at 5k ohm impedance The signal to be sent to the loudspeakers can then be selected by using the tape button with this button out the selected programme source is sent to the loudspeakers With the tape button pushed in the programme being received from the tape recorder will be sent to the loudspeakers in the case of a three head machine in record mode this will be the programme that is in the process of being recorded from the amplifier Hence instant comparison is possible between original and the recorded signals The replay level is adjustable in the A60 by two screwdriver adjustable controls accessible from inside the amplifier N B None of the amplifier controls apart from the input selector switches affect the signal being recorded To record in mono on either a mono or stereo recorder push the mono button before starting to record Again the signal being recorded is not affected by the amplifier controls apart from the input selectors To replay via the tape socket simply push the tape button and switch the recorder into play mode Tape recording using
11. amplifier and the feed to the tape and aux outputs O000 9 Specifications All input sensitivities nominal output levels and noise figures refer to 35 watts into 8Q at 1 kHz All noise figures are CCIR ARM weighted ref 1kHz These specifications refer to both the A60 and A60AP except where stated otherwise Inputs Magnetic cartridge Sensitivity 2 mV Overload Margin gt 38dB 20Hz 20kHz Noise lt 70dB 4 Frequency Response better than 0 3dB 0 5dB 40Hz 20kHz typically 0 2dB 70Hz 20kHz 2 5dB at 20Hz Input Impedance 47kQ in parallel with 100pF Switchable loading module available to provide the following additional loads 8 200pF 320pF 420pF and user programmable option Moving coil cartridge MC60 board fitted Sensitivity 1004 V Overload Margin gt 38dB at 1kHz Noise lt 63dB Input Impedance 3300 in parallel with 1000pF Switchable loading module available to provide the following additional loads 1000 300 100 100nF and user programmable option Tuner Sensitivity 100mV Overload Margin infinite Noise lt 85dB Input Impedance 100kQ Compact Disc Sensitivity 200mV Overload Margin infinite Noise lt 85dB Input Impedance 10 kQ Tape Sensitivity variable via adjustable preset controls 100mV 10V Noise lt 85dB Input Impedance 47kQ 100k depending on sensitivity setting Power amp A60AP only Sensitivity 600mV Input impedance 20 Noise lt 10
12. cartridge is to be used an additional internal plug in pre amplifier the MC60 must be fitted see page 9 The disc input impedance can be user adjusted over wide range by fitting the optional ULM M or ULM C plug in loading modules for moving magnet and moving coil cartridges respectively However most cartridges will perform satisfactorily without any loading module fitted see page 9 for further details of cartridge matching Tuner input The tuner input is suitable for use with almost any AM or FM tuner or radio C D input auxiliary output The C D Compact Disc input will accept any other signal but is particularly suitable for use with a Compact Disc player This socket also provides an output for recording onto a second cassette or reel to reel tape recorder see page 6 There is no C D socket on the A60AP as it is replaced by the socket see below The C D input is retained and is accessible via the spare pins of the tuner socket see page 7 The auxiliary recording output is not available on AP socket pre amplifier output power amplifier input AGOAP model only The AGOAP has the facility for the user to split the pre and power amplifiers into separate units This allows signal processors e g graphic equalisers to be inserted into the signal path or more complex systems such as ambisonic surround sound systems to be built up When the pre power amplifier split facility is not
13. ecorder is routed to the loudspeakers Further details of the tape monitoring facility may be found on page 6 High frequency filter When the filter switch is pushed in treble signals above approximately 7 5kHz are progressively reduced This is extremely useful for minimising unwanted hiss from noisy tapes or poor radio reception Under such conditions use of this filter is generally better than simply turning down the treble control Mono switch The amplifier is in its normal mode when the mono switch is out In this position the left and right input signals are amplified independently to appear at the corresponding loudspeaker outputs When the mono button is pushed in the left and right signals are mixed together and the combined signal is routed to both loudspeakers The signals sent from the amplifier to tape recorders via tape and aux sockets are also blended into mono when the switch is in Volume control The volume control adjusts the listening level on both loudspeakers and headphones NOTE that each of the treble bass and balance controls has a click stop the dead centre 12 o clock position to enable a flat frequency response and even channel balance to be set accurately and repeatably l Treble control The treble control progressively cuts treble signals when turned anti clockwise and boosts them when turned clockwise flat frequency response is obtained when the control
14. fuses Power supply Maximum Load 120VA Mains Voltage 240V nominal range 190 255 volts May be dealer adjusted to 120V nominal range 95 128 volts or 220V nominal range 175 235 volts Operation at below the nominal mains voltage will produce a corresponding reduction in the maximum output power Dimensions Width 450mm 17 in Depth 250mm 9 Height 60mm 2 in Weights A60 and A60AP Net 4 1Kg 9 01b Packed 4 8Kg 10 61 11 Typical performance graphs o m ET peccet 2119 0 re EEUU a tes NT Jer Tone control responses L 1 VA S RN pur shee p Ne LZ via line inputs a NC a eS er Sr O O sZ TZ A as pp AZ NS LL YS O D gue SISSE xp ee des Al Z LL LWwNEO Q Ia qp Lem 10 100 1K 10K 50K FREQUENCY Hz aus iege INPUTS ZI Se our veru MAE EE fa EUN INP NI Lp 1 1 a Fs ek ER DR EG D EG DER VID DN pu escud ecEeI a Ed pep T pue qq 3 STT S IN ble and high fil N Rumble and hi ilter responses 4 E E EE ES ewe ER ERI E RI Res creer E A piss oe a Edo a ox axe EA EMPIRE dw E ET UE ERE LLL LL tn 10 1K 10K 50K FREQUENCY Hz Pee se ee ee ee ee T H D vs power 03 output 1kHz D 4 ohm eI XE ACER HEREA
15. h connectors on the other ends of the leads to suit your loudspeakers It is important that the phasing of the loudspeakers is correct that is the black or terminal of each loudspeaker should be connected to the corresponding black socket of the A60 and the red or speaker terminal to the red for direct output or white for switched output socket The upper sockets are for the left hand speaker and the lower for the right Do not make any connection between the left and right loudspeaker leads 7 Fuses Loudspeaker fuses These are 1 6 Amp or less fast blow 20mm x 5mm diameter fuses They may blow if the amplifier is run continuously at high level into the correct loudspeaker load run at high level into a loudspeaker of too low an impedance 4ohms or less run into a short circuit They are user replaceable and two spares are provided However if they blow consistently without any of the above conditions obtaining please consult your dealer DO NOT replace with a fuse of greater value than 1 6 Amps or with a slow blow or anti surge fuse since this will endanger the amplifier and your loudspeakers and invalidate your guarantee Power supply fuses These are 3 15 Amp fast blow 20mm x 5mm diameter fuses They are NOT USER REPLACEABLE and spares are not supplied If these fuses blow there is probably a fault in the amplifier do not change the fuses but consult your dealer Mains fuse This
16. is a 1 Amp anti surge slow blow 20mm x 5mm diameter in all models This fuse is designed to protect against faults in the amplifier transformer and mains switch It is not normally user replaceable However should it blow during a continuous period of very high level music or on amplifier switch on it may be replaced once only WITH A FUSE OF THE CORRECT TYPE one spare is provided If a second fuse blows within a short period then there is a fault and the amplifier should be returned to your dealer Location of MC60 Loudspeaker fuses moving coil cartridge Location of disc D C supply fuses 1 6 Amp quick blow pre amplifier input loading NOT USER DO NOT replace with optional module optional REPLACEABLE higher values or anti surge Mains fuse 1 Amp anti surge Removal of wooden cover In order to inspect or change fuses or adjust the tape replay level controls you will need to remove the wooden cover from the amplifier BEFORE REMOVING THE COVER ALWAYS SWITCH OFF THE AMPLIFIER AND DISCONNECT FROM THE MAINS SUPPLY Note that the mains fuse remains live whenever the amplifier is plugged into the mains even when the amplifier power switch is in the off position To remove the cover unscrew the two black headed screws towards the rear of the side panels using a No 1 Pozidriv screwdriver Then slide the cover forward as far as it will go approximately 15mm and lift it vertically upwards Replacement is merely a reversal of this
17. is set accurately to the 12 o clock position It is unusual to have to use this control at its extremes i e outside the 9 o clock or the 3 o clock positions Bass control The bass control progressively cuts bass signals when turned anti clockwise and boosts them when turned clockwise Again the flattest response is obtained at the 12 o clock position The bass control in the A60 amplifier has been designed to operate at frequencies about an octave lower than normally encountered in other amplifiers Because of this a significant amount of boost or cut may be employed to compensate for loudspeaker deficiencies without affecting the lower middle frequencies Balance control The balance control is used to move the stereo sound image to the left or right It can be used to compensate for imbalances in room acoustics or input signals Headphones socket The headphones socket accepts any headphones fitted with a standard inch stereo jack plug The headphones may mute the loudspeakers or not as required see page 2 Tape recording Any tape recorder whether cassette or reel to reel may be connected to the tape socket and if two recorders are to be used the second model may be connected to input auxiliary output socket Tape recording using tape socket The tape socket is designed for use particularly with three head cassette or reel to reel machines although it is also perfectly suit
18. l then be sent to the loudspeakers Due to the reduced sensitivity of this input playback will sound quieter than when using the tuner or tape inputs N B A licence may be required for recording from disc radio or pre recorded cassette Technical details Spares kit You are provided with a spares kit containing the following two red and two black 4mm plugs for loudspeakers one 5 pin DIN plug for input sockets two spare speaker fuses 1 6 Amp fast blow one spare mains fuse 1 Amp anti surge one Allen key X Rs A F which fits the screws in the control knobs Connector wiring views from rear of plug as wired A60 MODEL ONLY AP Socket Tuner Socket Disc screen i L RE ER L L R LR Power Pre Tuner C D Amplifier amplifier Input Input from replay to record Input Output output or input Disc C D player Your turntable lead should be fitted with two PHONO plugs wired as illustrated If any other connector is fitted it should be removed and replaced by two PHONO plugs or a high quality adaptor lead used to interface Tuner A standard 5 pin 180 DIN plug to 5 pin 180 DIN plug lead such as A amp R lead type L01 should be used for connection to a tuner with a DIN socket output or a 5 pin 180 DIN plug pins 3 amp 5 to two PHONO plugs lead for a tuner with a PHONO socket output C D input auxiliary output When connecting a Compact Disc player with a phono socket out
19. ly to A60 and remove all input and output connections Remove the wooden cover see above Remove the linking socket from the 8 way plug near the disc input socket see diagram on page 8 and retain this in a safe place Insert the MC60 board into the 8 way plug ensuring that all pins engage correctly and that the board is in the correct orientation see diagram on page 8 Replace the wooden cover and re connect as before QU em Wh MG6O bo iS Se Scns moving coil 1A60 AP model only pre amplifier i t pre amp ro disc input volume 19dB h f tone balance l output pre amplifier amplifier filter control H_ et and equaliser i I I Lect 100k power amp T input 4 power amplifier O direct loudspeaker outputs phones C tacket switched output aux output not A60AP to right hand A60 BLOCK DIAGRAM channe Left channel only shown In the SYSTEM BLOCK DIAGRAM the C D input is at 200mV nominal level and has additional h f filtering to remove unwanted ultrasonic signals the tuner and tape are at 100mV levels and feed via the selector switch directly into the volume control the tape input in addition feeds via its own 100k ohm tape presets the disc input signal is amplified to 100mV to feed via the selector switch directly into the volume control the mono switch has two functions it monos separately the feed to the power
20. nd service information for all A amp R Cambridge products and considerable experience of their use in a variety of systems If however he is unable to answer your query then do not hesitate to contact us directly Installing and using your A60 Back panel connections A60AP AP tuner and Model only socket C D inputs ground terminal loudspeaker sockets heat sink compact disc disc input sockets mains cable inlet Mains supply The amplifier is normally set up for use with a nominal 240 volt 50 60 Hz supply It can be modified for a nominal 220 or 120 volt supply by your dealer or by the manufacturer The mains lead should be terminated with a three pin earthed plug fitted with a five amp fuse A 1 amp anti surge mains fuse is fitted internally It is recommended that the supply to the A60 be disconnected when the amplifier is not in use UNDER NO CIRCUMSTANCES SHOULD THE AMPLIFIER COVER BE REMOVED UNLESS THE SUPPLY IS DISCONNECTED AT THE WALL SOCKET Do not put excessive strain on the mains cable fixing either at the amplifier or at the plug Loudspeakers The outputs are suitable for driving loudspeakers of 8 ohms nominal impedance or higher 4 8 ohm loudspeakers when marked as such may also be used 4 ohm loudspeakers may be used if care is taken not to operate at very high levels The loudspeaker terminals will accept either wires or 4mm plugs The upper set of three terminals is for the
21. put a 5 pin 180 DIN plug pins 3 amp 5 to two PHONO plugs lead should be used If the player is equipped with a fixed lead terminated in two phono plugs then a high quality twin PHONO sockets to 5 pin 180 DIN plug pins 3 and 5 adaptor should be used e g A amp R lead type L02 If a tape recorder is being used in conjunction with this socket then the lead required here is usually a 5 pin 180 DIN plug to 4 PHONO plugs individually screened type If the recorder also has a low level DIN input then a 5 pin 180 DIN plug to 5 pin 180 DIN plug individually screened lead may also be used successfully in most cases i Tape A 5 pin 180 DIN plug to 4 PHONO plugs individually screened lead is required Tuner socket 60 model only In the A60AP the auxiliary input is available at pins 1 and 4 of the tuner socket see above It is accessible via the A amp R type L04 Y adaptor lead which terminates in two line DIN sockets for tuner and C D wired as the standard A60 s tuner socket see above AP socket pre amplifier output power amplifier input AG0AP model only The connections to this socket are shown above The leads required will depend upon the application but when used with the SA60X for two way active crossover systems a 5 pin 180 DIN to 5 pin 180 DIN crossover lead e g A amp R lead type L03 is required Loudspeakers 4 mm banana plugs or bare wires should be used wit
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