Tube Integrated Amplifier MA2275 Owner’s Manual McIntosh Laboratory, Inc.
The lightning flash with arrowhead, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. WARNING - TO REDUCE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. IMPORTANT SAFETY INSTRUCTIONS! PLEASE READ THEM BEFORE OPERATING THIS EQUIPMENT. 1. Read these instructions. 2. Keep these instructions. 3.
Thank You Table of Contents Your decision to own this McIntosh MA2275 Tube Integrated Amplifier ranks you at the very top among discriminating music listeners. You now have “The Best.” The McIntosh dedication to “Quality,” is 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. Safety Instructions ..................
Introduction and Performance Features Connector Information XLR Connectors Below is the Pin configuration for the XLR Balanced Input Connectors on the MA2275. Refer to the diagram for connection: Pin 2 PIN 1: Shield/Ground PIN 2: + Input Pin 1 PIN 3: - Input Pin 3 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 Positive Power Control Input on other N/C McIntosh Components.
Dimensions Dimensions The following dimensions can assist in determining the best location for your MA2275. There is additional information on page 8 pertaining to installing the MA2275 into cabinets. 17-3/4" 45.09cm 8-7/8" 22.54cm Front View of the MA2275 10-1/8" 25.72cm 16-3/4" 42.55cm Rear View of the MA2275 13-11/16" 34.77cm 17-3/4" 45.09cm 17" 43.18cm Side View of the MA2275 8-1/8" 20.64cm 9-3/4" 24.77cm 3/4" 1.91cm 12-3/4" 3-5/16" 32.39cm 5.
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 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 performance tests during the manufacturing process.
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 socket. Small Signal Tubes: 1. Locate a 12AX7A Tube. 2.
Installation in a Custom Cabinet 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 outlined 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.
Top Panel Connections and Tube Locations V3R KT88/ 6550 V2L KT88/ 6550 V1R 12AT7 V1L 12AT7 V2R KT88/ 6550 V3L KT88/ 6550 RIGHT Channel OUTPUTs connections for 2 ohm, 4 ohm and 8 ohm Loudspeakers V6 12AX7A V7 12AX7A V4 12AX7A LEFT Channel OUTPUTs connections for 2 ohm, 4 ohm and 8 ohm Loudspeakers V5 12AX7A 9
Rear Panel Connections External SENSOR or Keypad Jack permits the connection of a McIntosh IR Sensor or Keypad for remote operation Main Fuse holder, refer to information on the back panel of your MA2275 to determine the correct fuse size and rating Connect the MA2275 power cord to a live AC outlet.
How to Connect Loudspeakers How to Connect Loudspeakers Caution: The supplied AC Power Cord should not be connected to the Rear Panel of the MA2275 Integrated Amplifier until after Connections have been made. 1. Prepare the Loudspeaker Hookup Cables that attach to the MA2275 by choosing one of the methods below: Bare wire cable ends: Carefully remove sufficient insulation from the cable ends, refer to figures 1, 2 & 3. If the cable is stranded, carefully twist the strands together as tightly as possible.
How to Connect Audio Components How to Connect Audio Components 1. Connect an Audio Cable from the McIntosh CD Player Audio Outputs to the MA2275 CD INPUTS. 2. Connect an Audio Cable from the McIntosh Tuner 1 Outputs to the MA2275 TUNER INPUTS. 3. Connect an Audio Cable from a Turntable to the PHONO INPUTS and the Turntable Ground Connection to the GND grounding post. 4.
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 Amplifier to the Loudspeakers. Refer to page 11 in this Owner’s Manual for connection details. 3. Connect a Control Cable from the MA2275 POWER CONTROL MAIN Jack to the Power Control In of a McIntosh Power Amplifier. 4.
Front Panel Controls, Displays, Push-Buttons and Switch METER indicates the Power Output of the Left Channel Amplifier INPUT SELECTOR Control selects the program signals that are listened to and are available for recording HEADPHONES jack accepts dynamic headphones BASS Control provides 12dB boost or cut with a flat center position REC MONITOR Push-button with indicator, allows listening to the tape playback while the recording is in process IR Sensor receives commands from a remote control 14 TREBL
How to Operate the MA2275 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 Front Panel or the POWER Push-button on Figure 9 the Remote Control. The title TUBE WARMUP will illuminate on the Front Panel (located to the right of the STANDBY/ON Pushbutton) with the Audio Outputs muted until the tubes reach operating temperature.
How to Operate the MA2275, con’t Volume Control Adjust the VOLUME Control or press the UpS /DownT Pushbuttons on the Remote Control for the desired listening level. Refer to figure 13. 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 Amplifier should be functioning normally.
Notes 17
Remote Control Push-Buttons LED illuminates during the time a remote command is sent to the MA2275 Turns AC Power ON or OFF to certain 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 presets, disc tracks or any numbered operation Selects AM Tuner Operating Functions and Disc Selection on certain McIntosh CD
How to Operate by Remote Control How to Operate by Remote Control The supplied Remote Control is capable of directly controlling the functions of contemporary McIntosh Source Components connected to the MA2275. Earlier McIntosh source components and other brand source components can be controlled by the MA2275 Remote Control with the addition 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).
Notes 21
Specifications Specifications Power Output Minimum sine wave continuous average power output per channel, both channels operating is: 75 watts into a 2 ohm load 75 watts into a ohm load 75 watts into an 8 ohm load Voltage Gain High Level to Tape: 0dB High Level to Main: 15dB Rated Power Band 20Hz to 20,000Hz 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.
Packing Instructions Packing Instructions In the event it is necessary to repack the equipment for shipment, the equipment must be packed exactly as described and shown below. The MA2275 Vacuum Tubes must be removed from the Amplifier Tube Sockets and placed into the inside openings of the five layer foam packing material. The foam with the tubes located inside are placed into the Amplifier Tube Cover and secured to the Chassis.
McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, NY 13903 The continuous improvement of its products is the policy of McIntosh Laboratory Incorporated who reserve the right to improve design without notice. Printed in the U.S.A. McIntosh Part No.
