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McIntosh MC275 manual

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Table of contents for the manual

  • Page 1

    MC275 Owner ’ s Manual McIntosh Laboratory , Inc. 2 Chambers S treet Binghamton, New Y ork 13903-2699 Phone: 607-723-3512 F AX: 607-724-0549 S tereo Power Amplifier[...]

  • Page 2

    2 IMPOR T ANT SAFETY INSTRUCTIONS! PLEASE READ THEM BEFORE OPERA TING THIS EQUIPMENT . W ARNING - T O REDUCE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS EQUIPMENT T O RAIN OR MOISTURE. The lightning flash with arrowhead, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” wit[...]

  • Page 3

    3 Customer Service T echnical Assist ance Please T ake A Moment Thank Y ou Copyright 2004 © by McIntosh Laboratory , Inc. 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: Y our decision to own this [...]

  • Page 4

    4 Performance Features Introduction and Performance Features Introduction Now you can take advantage of traditional McIntosh stan- dards of excellence in the MC275 Stereo Power Amplifier . T wo 75 watt output channels will drive any high quality Loudspeaker System to its ultimate performance. The MC275 reproduction is sonically transparent and abso[...]

  • Page 5

    5 MC275 Dimensions The following dimensions can assist in determining the best location for your MC275. There is additional informa- tion on page 7 pertaining to installing the MC275 into cabi- nets. MC275 Dimensions 16 -1/2 " 41.91cm Front View of the MC275 T op V iew of the MC275 Left Side V iew of the MC275 Right Side V iew of the MC275 7 -[...]

  • Page 6

    6 Inst allation of T ubes and T ube Cover Caution: T o prevent electrical shock make sure that the AC POWER CORD IS NOT CONNECTED T O THE MC275 when inserting or removing T ubes, as there are hazardous voltages present at the pins of the T ube Sockets. Y our MC275 has gone through an extensive series of per- formance tests during the manufacturing [...]

  • Page 7

    7 Inst allation of T ubes, T ube Cover , Location and V entilation Small Signal T ubes: 1. Locate a 12AX7A T ube. 2. On the top left side of the amplifier , locate the T ube Socket that has the nomenclature V1 12AX7A next to it on the chassis. Refer to figure 4 and 5. 3. Orient the T ube so the area where no pins are located on the base of the T ub[...]

  • Page 8

    8 UNBALANCED INPUTS for audio cables from a preamplifier or control center audio outputs Left Side Panel Connections BALANCED INPUTS for audio cables from a preamplifier or control center audio outputs RIGHT OUTPUT Connections for loudspeakers LEFT OUTPUT Connections for loudspeakers[...]

  • Page 9

    9 Connect the MC275 power cord to a live AC outlet. Refer to information on the back panel to deter- mine the correct volt- age Main Fuse holder , refer to information on the back panel of your MC275 to determine the cor- rect fuse size and rating Right Side Panel Connection and Fuse Holder[...]

  • Page 10

    10 How to Connect for Stereo How to Connect for Stereo 1. Connect cables from the Balanced Outputs of a McIn- tosh Preamplifier or Control Center to the MC275 Left and Right Balanced Inputs. Note: An optional hookup is to use unbalanced cables. 2. Prepare the Loudspeaker Hookup Cables that attach to the MC275 by choosing one of the methods below: B[...]

  • Page 11

    11 Jumper Cables Refer to page 13 for the correct switch settings How to Connect for Mono Parallel How to Connect for Mono Parallel 1. Connect cables from the Balanced Output of a McIn- tosh Preamplifier or Control Center to the MC275 Right Balanced Input. Note: An optional hookup is to use unbalanced cables. 2. Prepare the Loudspeaker Hookup Cable[...]

  • Page 12

    12 Lef t Side Panel Controls and Switches MODE switch selects MONO (Parallel) or STEREO Modes of operation INPUTS switch se- lects between the BALanced or UNBALanced Inputs Power Switch turns all AC power On or Off UNBALANCED LEVEL Controls for each channel when us- ing the Unbalanced In- puts[...]

  • Page 13

    13 Power On and Off Press the POWER switch to the ON position and sound will be heard from the Loudspeakers when the tubes have reached their operating temperature. The amount of time it takes is dependent upon the temperature of the T ubes. Press the POWER Switch to the Off posi- tion to stop amplifying the audio signal. Refer to figure 7. Note: I[...]

  • Page 14

    14 Specifications Specifications Power Output S tereo Minimum sine wave continuous average power output per channel, both channels operating is: 75 watts into 4, 8 or 16 ohm load Power Output Mono (Parallel) Minimum sine wave continuous average power output is: 150 watts into 2 ohm, 4 ohm or 8 ohm load Output Load Impedance 4, 8, or 16 ohm (Stereo [...]

  • Page 15

    15 Packing Instructions Packing Instructions In the event it is necessary to repack the equipment for shipment, the equipment must be packed exactly as de- scribed and shown below . The MC275 V acuum T ubes must be removed from the Am- plifier T ube Sockets and placed into the inside open- ings of the four layer foam packing material. The foam with[...]

  • Page 16

    McIntosh Part No. 04091201 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.[...]