McIntosh MA2275 Stereo Amplifier User Manual
Contents
1. Tube Integrated Amplifier MA2275 Owner s Manual McIntosh Laboratory Inc 2 Chambers Street Binghamton New York 13903 2699 Phone 607 723 3512 FAX 607 724 0549 Melntosh The lightning flash with arrowhead The exclamation point within an equi within an equilateral triangle is intended CAUTION lateral triangle is intended to alert the to alert the user to the presence of user to the presence of important uninsulated dangerous voltage within TEN operating and maintenance servic the product s enclosure that may be of ing instructions in the literature ac sufficient magnitude to constitute a risk companying the appliance WARNING TO REDUCE RISK OF NO USER SERVICEABLE PARTS FIRE OR ELECTRICAL SHOCK DO INSIDE REFER SERVICING TO NOT EXPOSE THIS EQUIPMENT TO QUALIFIED PERSONNEL RAIN OR MOISTURE To prevent the risk of electric shock do not remove cover or 10 IMPORTANT SAFETY INSTRUCTIONS PLEASE READ THEM BEFORE OPERATING THIS EQUIPMENT Read these instructions Keep these instructions Heed all warnings Follow all instructions Do not use this apparatus near water Clean only with a 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 s2. 4 Chassis 0 H 4 8 Spacers 76cm ole 13 1116 34 77 US 9 346 c 10 516 Cutout Opening 23 34cm 26 19 for Ventilation pw 13 1 8 gt 33 34cm Top Panel Connections and Tube Locations ur J D A NP E UU SS sajupy 09915 313 GSLVHDALNI JgNL SLCCVW edhe rd Faas 8 70050 H3INHOJSNYHI 1ndinO 03714002 ALINN 170050 HSWHOISNYYL O ANOD ALINA 159 u sil V3R T J V2L KT88 gt T In KT88 ITI ENT 6550 ji VIR Y 12 7 12 7 e V3L Que V2R dae 25 e 6550 J 6550 I e 2d JUI ENTEN ENTE T TE Es RIGHT Channel OUTPUTS V7 V4 LEFT Channel OUTPUTS connections for 2 ohm 4 ohm 12 7 12 7 connections for 2 ohm 4 ohm and 8 ohm Loudspeakers and 8 ohm Loudspeakers V6 V5 12 7 12 7 Melntosh External SENSOR or Keypad Jack permits the con nection of a McIn tosh IR Sensor or Keypad for remote operation Main Fuse holder refer to information on the back panel of your MA2275 to determine the cor rect fuse size and rating Connect the MA2275 power cord to a live AC outlet Refer to information on the back panel to determine the correct volt
3. MA2275 UNIT TUBE COVER WITH FOAM PACK TUBE INSIDE 2X FOAM TUBE END 2X SHIPPING SKID Flat 1 4 20 X 2 1 4 CAP SCREW 4X INNER CARTON BOTTOM 23 x 3 1 J D VEI a ON Y 2 2 Sd Ji i V 7 Wr d Za McIntosh Laboratory Inc 2 Chambers Street Binghamton NY 13903 The continuous improvement of its products 1s the policy of McIntosh Laboratory Incorporated who reserve the right to improve design without notice Printed the U S A McIntosh Part No 04099200
4. tally bypass the Tone Control Circuitry commands from a remote control How to Operate the MA2275 Power On and Off Press the POWER switch to ON the Red LED above the STANDBY ON Push button lights to indicate the MA2275 is in Standby Mode To Switch On the MA2275 press the STANDBY ON Push button on the EF Front Panel or the bens POWER Push button on the Remote Control The title TUBE WARMUP will illuminate on the Front Panel located to the right of the STANDBY ON Push button with the Audio Outputs muted until the tubes reach operating temperature Refer to figures 9 and 10 Notes 1 For normal operation switch the MA2275 On and Off with the Standby On Push button If the Tube Integrated Amplifier is not going to be used for an extended period of time turn Off all AC Power with the Power Switch on the Front Panel 2 The amount of time required for Tube Warmup is dependant upon the temperature of the Tubes inside the MA2275 when the STANDBY ON Push button is depressed If there is an interruption of AC Power to the MA2275 while it is On the internal circuitry will sense this condition and will automatically switch the MA2275 back On when AC Power is restored Figure 9 Wo Input Source Selection Select the desired Source with the INPUT Selector Control or the Source Push button on the Remote Control Figure 10 Note For an explanation of the Remote Control Push b
5. Chambers Street Binghamton New York 13903 Phone 607 723 1545 Fax 607 723 3636 Customer Service If it is determined that your McIntosh product is in need of repair you can return it to your Dealer You can also return it to the McIntosh Laboratory Service Department For as sistance on factory repair return procedure contact the McIntosh Service Department at McIntosh Laboratory Inc 2 Chambers Street Binghamton New York 13903 Phone 607 723 3515 Fax 607 723 1917 Copyright 2004 O by McIntosh Laboratory Inc Table of Contents 2 Thank You and Please Take a Moment 3 Technical Assistance and Customer Service 3 Table of Contents and Important Information 3 loodi ON Pertorma3tce Ded UPC 4 OOS IRE A EA A ATT 5 Installation of Tubes Equipment Location and 6 Installation in Custom Cabinet 8 Top Panel Connections and Tube Locations 9 Rear Panel Connections treni ect mE AES IPM ERN 10 How to Connect Loudspeak6ts ertet nta 11 How to Connect Audio Components 12 How to Connect for a Second Room 13 Front Panel Controls Displays Push Buttons TT 14 HOW TO 15 Remote Control Push Buttons i i 18 How
6. or removing them as there may be hazardous voltages present at the Tube Socket Pins even after the MA2275 has been switched Off for a period of time Your MA2275 has gone through an extensive series of per formance tests during the manufacturing process The MA2275 is supplied with the actual Tubes that were used to test and confirm the performance of this integrated am plifier To protect the Vacuum Tubes from possible ship ping damage they are packed in five layers of foam placed into the Tube Cover and secured to the MA2275 Chassis Note Gloves or a soft cloth will prevent fingerprinting of the Tubes during their installation 1 Orient the MA2275 so the right Side Panel is facing you Refer to figure 1 2 Using an appropriate screwdriver remove the Tube Cover Fastening Screw 3 In a similar manner remove the Tube Cover Fasten ing Screw from the left side of the integrated ampli fier 4 Remove the tube cover from the MA2275 Chassis 5 Orient the Tube Cover to the wide opening along one side of its longer dimension Refer to figure 2 6 Remove the first layer of foam to expose the Tubes Refer to figure 3 7 Carefully remove the Tubes from the foam and tem porarily place them in a safe location 8 Remove the remaining foam from the Tube Cover and retain all five pieces for possible future use The MA2275 Chassis has nomenclature screened on it to specify the location in the circuit and Tube Type for each ch
7. your loudspeaker cables are 100 feet 76 2m or less use at least 12 Gauge Melntosh Connector Information XLR Connectors Below is the Pin configuration for the XLR Balanced Input Connectors on the MA2275 Refer to the diagram for con nection PIN 1 Shield Ground PIN 2 Input PIN 3 Input Power Control Connectors The MA2275 s Power Control Outputs provide a 5 volt signal Use a 1 8 inch stereo mini phone plug to connect to the Power Control Input on other NIC E McIntosh Components Ground Data Port Connectors The MA2275 s Data Port Output provides Remote Control Signals Use a 1 8 inch stereo mini phone plug to connect to the Data signal D Data Port Inputs on McIntosh Source Units N C Ground Introduction z X AA Xeoa aaaa G ga jissSSs Now you can take advantage of traditional McIntosh stan dards of excellence in the MA2275 Tube Integrated Ampli fier The versatile Preamplifier together with two 75 watt Power Amplifier Channels provide all the electronics nec essary to drive any high quality Loudspeaker System The MA2275 reproduction 15 sonically transparent and abso lutely accurate The McIntosh Sound is The Sound of the Music Itself Performance Features Power Output The MA2275 has two separate power amplifier channels each capable of 75 watts into 2 4 or 8 ohm Loudspe
8. ES A How to Operate the MA2275 con t Reset of Microprocessors In the event the controls of the MA2275 stop functioning push the POWER switch OFF and wait about two minutes Then push the POWER switch ON followed by pushing the STANDBY ON Push button This will reset the MA2275 microprocessors and the Tube Integrated Ampli fier should be functioning normally Note The above condition is usually caused by either interruptions in AC power and or major changes that may occur in AC power line voltage Using a Separate Power Amplifier There are two different ways to use a separate power am plifier with MA2275 The first way 15 to use the separate amplifier instead of the MA2275 built in Power Amplifier Connect the Loudspeakers to the separate power amplifier and remove the McIntosh Jumpers that are located between the OUT PUTS 1 Jacks and the POWER AMP IN put Jacks Refer to figures 15 and 16 Note The McIntosh Jumpers must be connected between the above mentioned jacks when the MA2275 Internal Power Amplifier is to be used The second way 1 to use both a separate power amplifier and the MA2275 built in Power Amplifier Connect one pair of Loud speakers to the separate power amplifier and the second pair to the MA2275 Refer to page 13 for connection information Note The MA2275 VOLUME Control will affect the sound level of all the Loudspeakers Figure 16 How To Make A Tape Recordi
9. Input Impedance Phono 47K ohms 65pF High Level 22K ohms Maximum Input Signal Phono 90mV High Level 8V Preamplifier Maximum Voltage Output Phono 8V High Level 8V Main Out 8V at preamp output 22 Specifications Voltage Gain High Level to Tape 0dB High Level to Main 15dB Wide Band Damping Factor Greater than 18 Power Requirements 100 Volts 50 60Hz at 3 6 amps 110 Volts 50 60Hz at 3 6 amps 120 Volts 50 60Hz at 3 6 amps 220 Volts 50 60Hz at 1 8 amps 230 Volts 50 60Hz at 1 8 amps 240 Volts 50 60Hz at 1 8 amps Note Refer to the rear panel of the MA2275 for the correct voltage Preamplifier Tube Compliment 2 12ZAX7A Phono Circuitry 2 1ZAX7A High Level Circuitry Power Amplifier Tube Compliment 2 I2AT7 4 KT88 6550 Overall Dimensions Width 15 17 3 4 inches 45 09cm Height is 10 1 8 inches 25 72cm including feet Depth is 18 3 4 inches 47 63cm including the Front Panel and Knobs Weight 77 pounds 35 kg net 110 pounds 50 kg in shipping car ton Packing Instructions Packing Instructions m E 1 In the event it 15 necessary to repack the equipment for shipment the equipment must be packed exactly as de scribed and shown below The MA2275 Vacuum Tubes must be removed from the Amplifier Tube Sockets and placed into the inside open ings of the five layer foam packing material The foam with t
10. ON McIntosh 205 e COMPACT DISC CHANGER MetNTOSH LABORATORY INC BINGHAMTON MADE IN USA opem e n p N EU To AC Outlet In Tape Recorder 12 How to Connect for a Second Room How to Connect for a Second Room 1 Connect Audio Cables from the MA2275 OUTPUTS PREAMP 2 to the second Power Amplifier Inputs 2 Connect Hookup Cables from the second Power Ampli fier to the Loudspeakers Refer to page 11 in this Keypad Owner s Manual for connection details 3 Connect a Control Cable from the MA2275 POWER CONTROL MAIN Jack to the Power Control In ofa McIntosh Power Amplifier gt 5 4 Connect an RG6 RG59U coaxial cable from the T EXTernal SENSOR Jack to a McIntosh Keypad nu Note A Wall Mounted IR Sensor may also be used in place of the Keypad 3 9 E l TPUTS se TAPE DVD TUNER e 9966 S399 900 09090000000 McIntosh Power Amplifier Right BE Left Loudspeaker Loudspeaker 4 ohm 4 ohm MeIntosh 13 Melntosh Front Panel Controls Displays Push Buttons and Switch METER indicates the TREBLE Control provides METER indicates the VOLUME Control Power Output of
11. afety purpose of the polarized or grounding type plug A polarized plug has two blades with one wider than the other grounding type plug has two blades and a third grounding prong The wide 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 11 12 13 14 15 16 5 back No user serviceable parts inside Only use attachments accessories specified by the manufacturer Use only with the cart stand tripod bracket or table specified by the manufacturer or sold with the apparatus When a cart 1s 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 1 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 Do not expose this equipment to dripping or splashing and ensure that no objects filled with liquids such as vases are placed on the equipm
12. age POWER CONTROL MAIN Output sends a turn on signal to an external McIntosh Power Amplifier when the MA2275 15 turned on Rear Panel Connections JUMPER PLUGS TAPE DVD TUNER connect the Pream CD and CD2 INPUTS plifier OUTPUTS accept unbalanced high PREAMP 1 Jacks to level program source the POWER AMP IN signals Jacks and are needed for normal operation POWER AMP IN TAPE OUTPUTS PHONO Input accepts inputs accept sig provide the Record signals from a Moving nals from a sepa Out Signal Magnet Phono Cartridge rate external preamplifier POWER CONTROL DATA PORTS send CD balanced INPUTS ACC Output sends a signals to McIntosh accept high level pro turn on signal to a Compatible Compo gram source signals McIntosh Source nents to allow control Component or Power with the Remote Control unit when the Control MA2275 is turned on PREAMP OUTPUTS Ground and 2 supply the connection Preamplifier Output for turntables to either the internal or external power am plifier How to Connect Loudspeakers How to Connect Loudspeakers Caution The supplied AC Power Cord should not be Banana plug connection connected to the Rear Panel of the MA2275 Insert the banana plug into the hole at the top of the Integrated Amplifier until after Connections have terminal been made Tighten the top 1 Prepare the Loudspeaker Hookup Cables that attach to portion of the mri the MA2275 by choosing one
13. akers e Bifilar Wound Transformers and Output Circuit The Power Output Circuitry utilizes the famous McIntosh Patented Unity Coupled Circuit with a Bifilar Wound Out put Transformer for low distortion extended frequency re sponse and cool operating output tubes Electronic Input Switching Digital Logic integrated circuits drive Electromagnetic Switches on all inputs and operating functions for reliable noiseless distortion free switching Introduction and Performance Features Balanced and Unbalanced Inputs The MA2275 has five Inputs for high level program sources and one Phono Input for a Moving Magnet Car tridge Tone Control Bypass The Bass and Treble Control Circuit Elements can be re moved from the Signal Path Low Distortion Distortion levels of all types are less than 0 5 Music 15 amplified with total transparency and accuracy Remote Control Operation A Remote Control is included that will allow control of major front panel controls and switches There are provi sions for connecting External Keypad and or Sensors which allows for enjoyment of your McIntosh System from other rooms in your home Illuminated Power Meters Peak responding Power Output Meters will indicate either continuously or in a peak hold mode for each channel There is also a Meter Illumination Off Mode 1f desired Gold Plated Connectors and Tube Socket Contacts Gold Plated Input Jacks and Output Binding Posts
14. annel Refer to figure 4 Note It is extremely important to insert the Tubes in the correct location Power Output Tubes 1 Orient the Chassis so the Front Panel of the Amplifier is facing you 2 Locate a 88 or 6550 Power Output Tube 3 On the top left side of the amplifier locate the Tube Socket that has the nomenclature V3L KT88 6550 next to it on the chassis 4 Orient the Tube so the key on the base of the Tube 1 aligned with the corresponding key on the Tube Socket 5 Carefully insert the Tube into the socket until the base of the Tube 15 fully seated in the Tube Socket Tube Cover D Screw Location Figure 1 Tube Cover with Layers of Foam and Tubes Figure 2 Power Output Tubes Small Signal Tubes Figure 3 _ prag rra prat E V3L KT88 6550 Tube COCCO Te ay y NS 4 12AX7A ee I VIR DAT7 Tubi 5 e e aa y oc NEED gs 0 pm MA2275 TUB INTEGRATED AMPLIFIER Mcintosh Figure 4 Installation of Tubes Tube Cover Location and Ventilation 6 Repeat the above the steps for the remaining 3 Power Output Tubes There are two different types of Small Signal Tubes 12AX7A and 12AT7 used in each channel Tube type can be found on the outside of the Tube The MA2275 will not function if they are inserted into the wrong soc
15. between Stereo and Mono Modes of operation Input Source Selection Press one of the Input Push buttons to select the desired program source Disc Player Music Server or Tape Recorder Functions Use these push buttons to operate a Disc Player or Tape Recorder Numbered Push buttons Press Push buttons 0 through 9 to access tuner station pre sets or Disc chapters tracks discs Disc and Track Use the DISC and TRACK Push buttons when a Disc Player Music Server or Tape Recorder is being used Note Certain Disc Players will require a Numbered Push button be pressed immediately after the Disc or Track Push button is depressed Volume Press the Down VOLUME Push button to raise or lower the listening volume level Note The TAPE OUPUTS are not affected by volume changes Tuner Push buttons Press the AM or FM push button to select the desired broadcast band Press and release the CHANnel UpA or Down VW push button to move from station to station Press and hold a CHANnel UpA or Down push button to How to Operate by Remote Control move continuously from station to station Press the 10 Push button to start the automatic brief audition of each of the presets stored in the tuner memory Press the 10 Push button a second time to stop on a station preset and exit the review process Acc On Acc Off Press ACC ON Push buton to switch the power ON to certain McIntosh Disc Players Press ACC OFF Push but ton to swi
16. ent To completely disconnect this equipment from the a c mains disconnect the power supply cord plug from the a c receptacle The mains plug of the power supply cord shall remain readily operable Thank You p nr n1 Your decision to own this McIntosh MA2275 Tube Inte grated Amplifier ranks you at the very top among discrimi nating music listeners You now have The Best The McIntosh dedication to Quality 1s assurance that you will receive many years of musical enjoyment from this unit Please take a short time to read the information in this manual We want you to be as familiar as possible with all the features and functions of your new McIntosh Please Take A Moment The serial number purchase date and McIntosh Dealer name are important to you for possible insurance claim or future service The spaces below have been provided for you to record that information Serial Number Purchase Date Dealer Name Technical Assistance If at any time you have questions about your McIntosh product contact your McIntosh Dealer who is familiar with your McIntosh equipment and any other brands that may be part of your system If you or your Dealer wish addi tional help concerning a suspected problem you can re ceive technical assistance for all McIntosh products at McIntosh Laboratory Inc 2
17. he tubes located inside are placed into the Amplifier Tube Cover and secured to the Chassis Failure to do this will result in damage to the Vacuum Tubes and possibly the MA2275 Four 1 4 20 x 2 1 4 inch cap screws and flat washers must be used to fasten the unit securely to the Shipping Skid This will ensure the proper equipment location in the Inner Carton Failure to do this will result in shipping dam age Use the original shipping carton and interior parts only if they are all in good serviceable condition If a shipping carton or any of the interior part s are needed please call or write Customer Service Department of McIntosh Labo ratory Please see the Part List for the correct part numbers SHIPPING CARTON TOP FOAM PAD TOP AND BOTTOM 2X p ZA INSIDE SIDE 2X FOAM PAD FRONT AND REAR 2X SHIPPING CARTON BOTTOM IMPORTANT Read Above Wn FOAM PAD Quantity 1 NNN N BR Re Part Number 034052 034051 034054 034186 034187 034180 034179 034136 034137 034008 034161 101212 104058 Description Shipping carton top Shipping carton bottom Foam Pad top and bottom Foam Pad front and rear Foam Pad sides Foam pack tube ends Foam pack tube inside with tube cutouts Inner carton top Inner carton bottom Bottom pad Shipping skid 1 4 20x2 1 4 cap screw Flat washer INNER CARTON TOP FOAM PAD INNER CARTON
18. ket Small Signal Tubes 1 Locate a 12AX7A Tube 2 On the top center area of the amplifier locate the Tube Socket that has the nomenclature V4 12AX7A next to it on the chassis Refer to figure 4 Orient the Tube so the area where no pins are located on the base of the Tube 1s aligned with the corre sponding area on the Tube Socket 4 Carefully insert the Tube into the socket until the base of the Tube 15 fully seated in the Tube Socket Repeat the above steps for the remaining three 12AX7A Tubes Refer to figure 5 Locate a 12AT7 Tube On the right side of the amplifier locate the Tube Socket that has the nomenclature VIR 12AT7 next to it on the chassis Refer to figure 4 Insert the Tube following the same procedure as in steps 3 and 4 9 Repeat steps 6 9 for the remaining 12AT7 Tube Re fer to figure 5 Caution To prevent electrical shock make sure the MA2275 Tube Cover is installed before connecting the AC Power Cord Before operating the MA2275 locate the previously re moved Tube Cover and perform the following steps Installing the Tube Cover 1 The Tube Cover has a wide opening along one side of its longer dimension Orient this wide opening so it is facing towards you 2 Carefully place the Tube Cover onto the MA2275 Refer to figure 6 3 Using an appropriate screwdriver secure the Tube Cover to the chassis using the previously installed screws gt O Location a
19. nd Ventilation Adequate ventilation extends the trouble free life of the MA2275 The suggested minimum space for operating the MA2275 is 24 inches 60 96cm in width 20 inches 50 8cm depth and 22 5 inches 57 15cm in height AI ways allow air to flow through the ventilation holes on the bottom of the amplifier and a means for the warm air to es cape at the top refer to figure 7 For installation of the MA2275 into a cabinet refer to the next page ET T Screw Location icm ih ELE FL COCO 12AX7A ANI li L9 6550 E c le A effi Mcintosh MA2275 INTEGRATED AMPLIFIER reo By Figure 5 Figure 6 Warm Air DM UE ls It fft Figure 7 Melntosh The MA2275 can be placed upright on a table or shelf standing on its four feet It also can be custom installed in a piece of furniture or cabinet of your choice The four feet may be removed from the bottom of the MA2275 when it is custom installed as out lined below The four feet together with the mounting screws should be retained for possible future use if the MA2275 is removed from the custom installation and used free standing Install the four supplied chassis MA2275 Front Panel spacers into the threaded Custom Cabinet Cutout openings on the bottom lo cated next to the jus
20. ng 1 Select the source signal you wish to record using the INPUT SELECTOR Control 2 Adjust the record level using the tape recorder volume control and proceed with the recording process 3 Press the REC MON Push button and listen to the tape playback of the just recorded program source selected Note The MA2275 TAPE OUTPUTS are not affected by the VOLUME or BALANCE controls STANDBY ON rome t TUBE WARMUP aE Figure 14 Note For an explanation of the Remote Control Push button functions refer to pages 18 and 19 16 Notes Ji LL LLLLL LLL LLL LLL LL LLL 17 Melntosh LED illuminates during the time a remote command is sent to the MA2275 Turns AC Power ON or OFF to cer tain McIntosh Components when connected via the Data Port Selects Functions for McIntosh Home Controller and as a shift key when used with the AM or FM push buttons to select Output Spkr 1 or 2 Switches OFF the entire MA2275 System Use to select tuner pre sets disc tracks or any numbered operation Selects AM Tuner Operating eee Functions and Disc Selection on certain McIntosh CD Play ers Press to REVIEW Tuner Station Presets and selects certain func tions on McIntosh CD Players Mutes the audio Selects Disc Player Music Server or Tape Recorder Functions and also per forms various functions on a variety of McIntosh Components Selects one of the five High Level Audio Sources or the Phono I
21. nput Remote Control Push Buttons Press to Power the MA2275 ON or OFF Press MODE to switch between Stereo or Mono Modes Press to Power ON the MA2275 Press to Power OFF the MA2275 Selects FM Tuner Operat ing Functions and Track Selection on certain McIntosh CD Players Adjusts the volume level up or down MODE Pl AND Selects On Screen Func tions for McIntosh DVD Players and certain CD Players Selects the FF Fast For ward or REWind Mode on Disc Player Music Server or Tape Recorder tunes Up or Down the AM FM Dial Notes Push buttons whose function is not identified above are for use with other McIntosh Products The Remote Control shipped with your MA2275 may differ from the illustration above however the functionality is the same How to Operate by Remote Control The supplied Remote Control is capable of directly control ling the functions of contemporary McIntosh Source Com ponents connected to the MA2275 Earlier McIntosh source components and other brand source components can be controlled by the MA2275 Remote Control with the ad dition of a McIntosh Remote Control Translator RCT Note Your McIntosh Dealer can assist you with the installation and operation of the Remote Control Translator RCT Mute Press the MUTE Push button to mute audio at the Loud speaker and Headphone Outputs Press MUTE a second time to unmute audio Mode Press the MODE Push button to select
22. of the methods below terminal post Pa Figure 7 P A Figure 8 Bare wire cable ends mE addo eo Carefully remove sufficient insulation from the cable ends refer to figures 1 2 amp 3 If the cable is stranded Screw to secure the banana plug carefully twist the strands together as tightly as pos in place sible Note The use of Banana Plugs is for use in the United Note If desired the 0 5 inches 7 States and Canada only Refer to figures 7 and 8 twisted ends can be 127 tinned with solder to keep the strands together or attach spade lug and or banana connector Spade lug or prepared wire connection Insert the spade lug connector or prepared section of the cable end into the terminal side access hole and tighten the terminal cap until the cable is firmly clamped into the terminal so the wires cannot slip out Refer to figures 4 5 amp 6 2 Connect the Loudspeaker hookup cables to the output Figures terminals that match the impedance of the Loudspeak er being careful to observe the correct polarities Out put impedance connections of 2Q ohm 462 ohm and 8 ohm are provided If the Loudspeaker s imped ance 15 in between the available connections use the nearest lower impedance connection WARNING Loudspeaker terminals are hazardous live and present a risk of electric shock For additional instr
23. provide trouble free connections Ceramic tube sockets with gold plated contacts provide protection from atmospheric con tamination Output Tube Sockets include Air Pipe cooling at their bases Fiber Optic Solid State Front Panel Illumination The even Illumination of the Glass Front Panel is accom plished by the combination of custom designed Fiber Optic Light Diffusers and extra long life Light Emitting Diodes LEDs Super Mirror Chassis Finish The Stainless Steel Chassis with Super Mirror Finish en sures the pristine beauty of the MA2275 will be retained for many years Dimensions The following dimensions can assist in determining the best location for your MA2275 There is additional infor mation on page 8 pertaining to installing the MA2275 into cabinets _ 0075 07 S 75 25 75 40 30 20 410 Dimensions 17 3 4 45 09cm 8 7 8 10 1 8 22 54 25 72cm Front View of the MA2275 16 3 4 42 55cm Rear View of the MA2275 99 99 9 9 2000000000 ge0o t 009090009 13 11 16 P 34 7 cm i 17 3 4 45 09cm Me 43 18cm m Side View of the MA2275 8 1 8 20 64cm 9 3 4 24 7 cm 3 4 1 91cm 12 3 4 3 5 16 32 39cm 5 87cm Melntosh Installation of Tubes and Tube Cover Caution To prevent electrical shock make sure the AC POWER CORD IS NOT CONNECTED TO THE MA2275 Also do not touch the Vacuum Tube Connection Pins when inserting
24. r Rotate the BALANCE Control clockwise to em phasize the Right Channel by reducing the volume level of the Left Channel Rotate the BALANCE Control counter clockwise to de emphasize the Right Channel until equal Balance of both Channels is achieved I5 Melntosh Volume Control Adjust the VOLUME Control or press the UpA Down Push buttons on the Remote Control for the desired listening level Refer to figure 13 Record Monitor Press the REC MONITOR Push button to hear the TAPE Playback Signal during the re cording process Refer to figure 14 Tone Bypass Press the TONE BYPASS Push button to totally Bypass the Tone Control Circuitry providing a flat frequency response Note The MA2275 will automatically remember for each input whether the Tone Bypass is active Mono Press the MONO Mode Push button to combine Left and Right Stereo Signals to Mono for the Loudspeaker Outputs PREAMP OUTPUTs 1 amp 2 and the HEAD PHONES Jack The MODE Push button on the Remote Con trol also can be used to switch between the Stereo and Mono Modes of Operation Refer to figure 13 Note The TAPE Outputs are not effected by the Mono Mode of Operation MeIntosh Figure 13 Mute Press the MUTE Push button to Mute the Audio at the Loudspeaker Outputs and PREAMP OUTPUTS 1 amp 2 An LED above MUTE Push button on the front panel will flash On and Off during the time the audio is muted REC MON TONE BYPASS HEADPHON
25. t re moved four feet The re quired panel cutout ventila tion cutout and unit dimen sions are shown Installation in a Custom Cabinet panel Allow 1 inch 2 54cm in front of the mounting panel for knob clearance Be sure to cut out a ventilation hole in the mounting shelf according to the dimensions in the drawing 1 7 1 4 43 82cm IMIntosh 19075 075 25 25 5 warts E 0075 75 78 7 5 4l 20 5 8 1 4 20 96cm Cutout Opening for Custom Mounting Always provide ad Cabinet 12 MM Front 39 48cm equate ventilation for your Panel MA2275 Cool operation ensures the longest possible Opening operating life for any elec for Ventilation tronic instrument Do not install the MA2275 directly above a heat generating component such as a high MA2275 Side View powered amplifier If the MA2275 1s installed in a cabinet a quiet running ventilation fan can be a definite asset in maintain ing the coolest possible op in Custom Cabinet erating temperature Support A custom cabinet instal Shelf lation should provide the following minimum spac ing dimensions for cool op eration Allow at least 12 inches 30 48cm above the top 2 inches 5 08cm be low the bottom and 3 inches 7 62cm on each side of the amplifier so that airflow is not obstructed Allow 20 inches 50 8cm depth behind the front 2 MA2275 Bottom View in Custom Cabinet 5 08cm
26. tch the power OFF to certain McIntosh Disc Players The ACC ON OFF Push buttons also control the signal at the ACCessory B Power Control Jack it will also remember the last command when the MA2275 1s switched Off and On again Pause Press to perform various functions on a variety of McIn tosh Components It will also pause the playing of a Disc or Tape playback Melntosh Notes Ji LL LLLLL LLL LLL LLL LL LLL 21 Melntosh Specifications Power Output Minimum sine wave continuous average power output per channel both channels operating 1s 75 watts into a 2 ohm load 75 watts into a ohm load 75 watts into an 8 ohm load Rated Power Band 20Hz to 20 000Hz Total Harmonic Distortion Maximum Total Harmonic Distortion at any power level from 250 milliwatts to rated power output is 0 5 for a 2 4 or 8 ohm load Frequency Response 0 0 5dB from 20Hz to 20 000Hz 0 3dB from 10Hz to 50 000Hz Sensitivity Phono 4 4mV for 2 5V rated output High Level 450mV for 2 5V rated output Power Amplifier Input 2 5V for rated output A Weighted Signal To Noise Ratio Phono Input 80dB below 10mV input High Level 97dB below rated output Power Amplifier 110dB below rated output Intermodulation Distortion Maximum Intermodulation Distortion 1f instanta neous peak output does not exceed twice the rated output for any combination of frequencies from 20Hz to 20 000Hz is 0 5 for a 2 4 or 8 ohm load
27. the Left 12dB boost or cut with a Power Output of the Right adjusts the listening Channel Amplifier flat center position Channel Amplifier volume level of the Loudspeakers and Headphones INPUT SELECTOR BASS Control pro METER Control selects The BALANCE Control selects the pro vides 12dB boost or the display modes of the Control adjusts the relative volume bal ance between chan nels cut with a flat center Power Output Meter position gram signals that are listened to and are available for recording a n gt En A ARD Melntosh 0075 075 78 78 o WATTS 0075 O75 757 5 75 9 p sonca o 2275 Hg 80 TUBE INTEGRATED AMPLIFIER DECIBELS POWER OUTPUT POWER OUTPUT INPUT SELECTOR VOLUME BASS WATT BALANCE CD TUNER CD2 DVD Va PHONO e HEADPHONES REC MONITOR Push but MONO Push button STANDBY ON POWER Switch jack accepts dy ton with indicator allows combines left and right Push button turns turns all AC namic headphones listening to the tape play stereo signals to mono the MA2275 ON power completely back while the recording 15 at the Headphones and or OFF Standby ON or OFF in process PREAMP OUTPUTS 1 amp 2 IR Sensor receives TONE BYPASS Push button MUTE Push button TUBE WARMUP indicates when the audio output is muted until the tubes reach operating temperature mutes the listening audio allows the audio signal to to
28. to Operate by Remote Control 19 DDECEPEHIC OH 2 2 Packing InStbuc 23 Important Information D Jr P I Caution To prevent electrical shock make sure the AC POWER CORD IS NOT CONNECTED TO THE MA2275 Also do not touch the Vacuum Tube Connection Pins when inserting or removing them as there may be hazardous voltages present at the Tube Socket Pins even after the MA2275 has been switched Off for a period of time 2 When Vacuum Tubes are installed or removed reattach the Tube Cover with the Original Tube Cover Screws 3 If the MA2275 has been On please allow the Hot Vacuum Tubes to cool first before removing them 4 The following Connecting Cable is available from the McIntosh Parts Department Data and Power Control Cable Part No 170 202 Six foot 2 conductor shielded with two 1 8 inch stereo mini phone plugs 5 For additional connection information refer to the owner 5 manual s for any component s connected to the MA2275 6 It is very important that loudspeaker cables of adequate size be used so that there will be minimum power loss The size is specified in Gauge Numbers or AWG American Wire Gauge The smaller the Gauge number the larger the wire size Connection Terminals will accept up to a 6 AWG wire size If your loudspeaker cables are 50 feet 38 1m or less use at least 14 Gauge If
29. uction on making Loudspeaker Connections contact your McIntosh Dealer or McIntosh Technical Support Figure 4 Figure 5 Figure 6 MIHI Right Left Loudspeaker Loudspeaker 4 ohm 4 ohm 11 Melntosh How to Connect Audio Components How to Connect Audio Components 1 Connect an Audio Cable from the McIntosh CD Player 6 Connect a Control Cable from the McIntosh Tuner Audio Outputs to the MA2275 CD INPUTS Power Control Out Jack to the Power Control In jack 2 Connect an Audio Cable from the McIntosh Tuner on the McIntosh CD Player 1 Outputs to the MA2275 TUNER INPUTS 7 Connect a Control Cable from the MA2275 TUNER 3 Connect an Audio Cable from a Turntable to the DATA PORT Jack to the McIntosh Tuner Data In PHONO INPUTS and the Turntable Ground Connec Tuner 1 tion to the GND grounding post 8 Connect a Control Cable from the MA2275 CD2 4 Connect an Audio Cable from the MA2275 TAPE DATA PORT Jack to the McIntosh CD Player Data In OUTPUTS to the Record Inputs of a Tape Recorder Jack and from the MA2275 TAPE INPUTS to the Tape Re 9 Connect the MA2275 Power Cord to a live AC outlet corder Outputs 5 Connect a Control Cable from the MA2275 POWER CONTROL ACC Jack to the Power Control In on the McIntosh Tuner McIntosh Tuner McIntosh CD Player n CAUTI
30. utton functions refer to pages 18 and 19 How to Operate the MA2275 Bass and Treble Controls Adjust the BASS and TREBLE controls to suit your listen ing preferences The Bass or Treble intensity can be in creased with clockwise rotation and decreased with coun terclockwise rotation Meter Mode Selection Rotate the Meter Mode Switch to select the meter opera tion mode you desire Refer to figure 11 and 12 Lights Off Meter lights are turned off and the meter will continue to indicate the power output Watts The meters respond to METER WATTS all the musical infor Lars RB HOLD mation being pro duced by the ampli fier They indicate to an accuracy of at least 95 of the power output with only a single cycle of a 2000Hz tone burst Figure 11 WATTS 075 75 75 0075 075 79 Sa 20 16 40 30 DECIBELS POWER OUTPUT Figure 12 Hold The meter pointer is locked to the highest power peak in a sequence of peaks It is elec tronically held to this power level until a higher power peak passes through the amplifier The meter pointer will then rise to the newer higher indication If no further power peaks are reached the meter pointer will very slowly return to its rest position or lower power level The decay rate is approximately 6dB per minute Balance Control Adjust the BALANCE Control as needed to achieve ap proximately equal listening volume levels in each Loud speake
Download Pdf Manuals
Related Search