THE MCINTOSH MC 2105 SOLID STATE STEREO POWER AMPLIFIER Reading Time: 28 Minutes Price $1.
Your MC 2105 Stereo Power Amplifier will give you many years of pleasant and satisfactory performance. If you have any questions, please contact: CONTENTS SERVICE CONTRACT CUSTOMER SERVICE Mclntosh Laboratory Inc. 2 Chambers Street Binghamton, New York 13903 Phone: 607-723-3512 1 INSTALLATION 2,3 HOW TO CONNECT 4,5 HOW TO USE THE DYNAMIC PEAK LOCKING METERS . . . 6 WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE. FRONT PANEL INFORMATION . . .
To prepare the MC 2105 for installation remove the plastic protective covering. Turn it upside down so that it rests on its top on the shipping pallet. Remove the four plastic feet fastened to the bottom of the chassis. Next, place the mounting brackets, the parts bag and the mounting template at hand. The PANLOC professional mounting design eliminates the need for any shelf or bracket to support the MC 2105. It is completely supported by its own mounting brackets.
Attach the mounting brackets to the cabinet panel using four screws. Place the template over the mounting screws. The mounting screws should be centered in the "A" and "B" holes on the template. The sides of the mounting brackets should match the vertical dash lines on the template. If necessary, loosen the screws and push the brackets into alignment and retighten. Insert the power cord through the opening.
HOW to Connect INPUT STEREO SPEAKER CONNECTIONS The shielded cable from the left output of the Mclntosh preamplifier is plugged into the left jack. The shielded cable from the right output of the Mclntosh preamplifier is plugged into the right jack. Use this table to determine proper speaker connection. Connect the If the speaker impedance speaker leads is between: between COM and: 3.2 to 6.5 ohms 4 ohms 6.
5
HOW to Use the Dynamic Peak Locking Meters A tape recorder can be checked in the same fashion. 1. Use a standard frequency response tape as the signal source. 2. Complete all steps outlined for phono cartridges. 3. You now have a graph of the playback characteristics of your tape recorder. To find the record characteristics of the tape recorder follow this procedure: 1. Record the CBS Test Record STR1000 on your tape recorder. Adjust the record volume only on the 1000 Hz signal for proper recording level.
IDEAL RIAA SYSTEM RESPONSE USING CBS STR 100 TEST RECORD 4 2 0 -4 -6 -8 -10 -12 RELATIVE OUTPUT LEVEL IN dB -2 -14 -16 -18 20 1,000 100 -20 10,000 20,000 4 2 0 -4 -6 -8 -10 -12 14 -16 -18 20 100 1,000 FREQUENCY IN Hz 7 -20 10,000 20,000 RELATIVE OUTPUT LEVEL IN dB -2
Front Panel information LEFT GAIN the amplifier delivers 25 watts; and a meter indication of -10dB, the amplifier delivers 5 watts. Use the left gain control to adjust the volume in the left channel to the desired listening level. Turn the control clockwise to increase the volume. (A meter reading of +3.2dB indicates 105 watts power output.) RIGHT GAIN HEADPHONE Use the right gain control to adjust the volume in the right channel to the desired listening level.
Performance Limits and Ratings RATINGS OUTPUT VOLTAGES 25 volts for distribution lines PERFORMANCE GUARANTEE Performance Limits are the maximum deviation from perfection permitted for a Mclntosh instrument. We promise you that the MC 2105 you buy must be capable of performance at or exceeding these limits or you get your money back. McIntosh is the only manufacturer that make this guarantee.
Technical Description sive mismatch of the output. When your MC 2105 operates normally the SENTRY MONITORING CIRCUIT has no effect on signals passing through the power amplifier. If the power dissipation should rise above normal operation, the SENTRY MONITORING CIRCUIT restricts the drive to the output transistors. The SENTRY MONITORING CIRCUIT acts instantaneously for any input signal or load combination. This arrangement assures complete circuit reliability.
Block Diagram 12
MCINTOSH LABORATORY INC. 2 CHAMBERS ST., BINGHAMTON, N. Y. 13903 607-723-3512 Design subject to change without notice. Printed in U.S.A.
