User manual MCINTOSH MA2275

[. . . ] 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 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. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance. WARNING - TO REDUCE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL. To prevent the risk of electric shock, do not remove cover or back. No user serviceable parts inside. IMPORTANT SAFETY INSTRUCTIONS! PLEASE READ THEM BEFORE OPERATING THIS EQUIPMENT. 1. [. . . ] Remove the tube cover from the MA2275 Chassis. Orient the Tube Cover to the wide opening along one side of its longer dimension. Remove the first layer of foam to expose the Tubes. Insert the Tube, following the same procedure as in steps 3 and 4. Repeat steps 6-9 for the remaining 12AT7 Tube. Refer to figure 5. Caution: To prevent electrical shock make sure the MA2275 Tube Cover is installed before connecting the AC Power Cord. 12AX7A KT88/ 6550 12AT7 KT88/ 6550 Figure 5 Tube Cover Tube Cover Fastening Screw Locations Before operating the MA2275, locate the previously removed 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. Carefully place the Tube Cover onto the MA2275. Using an appropriate screwdriver secure the Tube Cover to the chassis using the previously installed screws. Fastening Screw Location Tube Cover Figure 6 Warm Air Location and 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. Always allow air to flow through the ventilation holes on the bottom of the amplifier and a means for the warm air to escape at the top, refer to figure 7. For installation of the MA2275 into a cabinet, refer to the next page. Cool Air Figure 7 7 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. Install MA2275 Front Panel the four supplied chassis Custom Cabinet Cutout spacers into the threaded openings on the bottom located next to the just removed four feet. The required panel cutout, ventilation cutout and unit dimensions are shown. Cabinet Always provide adFront equate ventilation for your Panel MA2275. Cool operation ensures the longest possible Opening for Ventilation operating life for any electronic instrument. Do not install the MA2275 directly above a heat generating component such as a high MA2275 Side View powered amplifier. If the in Custom Cabinet MA2275 is installed in a cabinet, a quiet running ventilation fan can be a definite asset in maintaining the coolest possible operating temperature. [. . . ] Press ACC OFF Push-button to switch 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 is switched Off and On again. Pause Press to perform various functions on a variety of McIntosh Components. It will also pause the playing of a Disc or Tape playback. Mute Press the MUTE Push-button to mute audio at the Loudspeaker and Headphone Outputs. [. . . ]