THE MclNTOSH MC 502 POWER AMPLIFIER Reading Time: 28 Minutes Price $2.
VARIOUS REGULATORY AGENCIES REQUIRE THAT WE BRING THE FOLLOWING INFORMATION TO YOUR ATTENTION. PLEASE READ IT CAREFULLY. WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE. The Mclntosh you have purchased is a Model MC 502. It has a serial number located on the rear panel of the chassis. Record that serial number here: Serial Number The model, serial number and purchase date are important to you for any future service.
Your MC 502 Stereo Power Amplifier will give you many years of pleasant and satisfactory performance. If you have any questions, please contact: Contents CUSTOMER SERVICE Mclntosh Laboratory Inc. 2 Chambers Street Binghamton, New York 13903 Phone: 607-723-3512 HOW TO INSTALL... 2,3 HOW TO CONNECT... 4 THE FRONT PANEL CONTROLS AND HOW TO USE THEM... 7 REAR PANEL INFORMATION... 8 PERFORMANCE LIMITS... 9 PERFORMANCE CHARTS ...10,11 TECHNICAL DESCRIPTION ...12,13 BLOCK DIAGRAM...
The recommended minimum space for installation is 15 inches (38.1 cm) deep, 17 inches (43.2 cm) wide, and 4-1/2 inches (11.4 cm) high. To install the instrument in a Mclntosh cabinet, follow the instructions that are enclosed with the cabinet. For any other type of installation follow these instructions: 1. Open the carton and remove the PANLOC brackets, hardware package, and mounting template from the carton.
. Install the Mounting Strips In the hardware package you will find two mounting strips, and two sets of machine screws. For panels that are less than 1/2 inch thick, use the 3/4 inch screws; for panels that are more than 1/2 inch thick, use the 1-1/4 inch screws. Starting at the right-hand side of the panel, insert a screw of the proper length into the center hole in the panel, marked B on the templete.
How to Connect INPUT STEREO OR TWIN AMPLIFIER OPERATION Use shielded cables to connect the signal from the preamplifier or signal source to the power amplifier input. To minimize the possibility of hum the shielded cables should be run parallel to each other or loosely twisted together. Locate the cables away from speaker leads and AC power cords. All connections are made on the back panel of the MC 502.
LEFT SPEAKER RIGHT SPEAKER Stereophonic Connections MONO STEREO MODE PROGRAM SOURCE PLACE SWITCH IN STEREO POSITION FOR STEREO OPERATION
Monophonic Connections SPEAKER MONO STEREO MODE PLACE SWITCH IN STEREO POSITION FOR STEREO OPERATION PROGRAM SOURCE
Front Panel Controls and How to Use Them LEFT GAIN 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. POWER The power switch turns the MC 502 ON or OFF. The switch does not control the power outlet on the back panel. If you wish to control the AC power from a preamplifier control center leave the switch in the ON position.
Rear Panel Information LEFT and RIGHT OUTPUT AC POWER For stereo operation, output connections for impedances of 2.7 to 8 ohms are provided on a secure, screw type barrier strip. For monophonic operation proper interconnection provides 8 ohms from the same barrier strip. The MC 502 is rated for 120 volts, 50/60 hertz. It uses 0.2 amperes (20watts) when there is no signal output and up to 4 amperes (400 watts) with both channels delivering rated power. A 4 ampere fuse protects the MC 502 electrically.
Performance Limits We promise you that the MC 502 you buy must be capable of performance at or exceeding these limits at the time of purchase or you get your money back. Mclntosh PERFORMANCE LIMITS are the maximum departure from perfection permitted for a Mclntosh instrument. INTERMODULATION DISTORTION STEREO: .02% maximum per channel with both channels operating for any combination of frequencies, 20 Hz to 20,000 Hz. MONO: .
Performance Charts 240 220 RMS WATTS 200 180 160 140 120 100 80 60 40 20 0 10 1k 100 10k 100k 10k 100k FREQUENCY IN Hz 140 130 120 110 RMS WATTS 100 90 80 70 60 50 40 30 20 10 0 10 1k 100 FREQUENCY IN Hz - 1 dB 0 -1 -2 -3 10 100 1k FREQUENCY IN Hz 10 10k 100k
% DISTORTION .05 .04 .03 .02 .01 0 20 1k 100 10k 20k % DISTORTION FREQUENCY IN Hz .05 .04 .03 .02 .01 0 1 10 100 1000 100 1000 % DISTORTION RMS WATTS .05 .04 .03 .02 .01 0 .1 1 10 % DISTORTION RMS WATTS .05 .04 .03 .02 .01 0 .
Technical Description sistors. This protection greatly contributes to the reliable, long life, performance of the MC 502. Power Guard is the second control circuit. Amplifiers are capable of delivering large quantities of power when they are driven to clipping. Clipping is caused when the amplifier is asked to produce more power output than it can deliver with low distortion. A clipped amplifier can have more than 40% harmonic distortion.
Power Supply Two high current power supplies - a positive 40 volt DC and a negative 40 volt DC - are used to drive the output power amplifier. Two very large filter capacitors, 10,000 microfarads each, are used to store a large amount of energy to provide good filtering and excellent voltage regulation. Good low frequency response and negligible low frequency distortion in the power amplifier stages depends on the regulation of the power supply.
14 Block Diagram MclNTOSH MC 502 STEREO POWER AMPLIFIER
MclNTOSH LABORATORY INC. 2 CHAMBERS ST., BINGHAMTON, N.Y. 13903-2699 607-723-3512 The continuous improvement of its products is the policy of Mclntosh Laboratory Incorporated who reserve the right to improve design without notice. Printed in U.S.A.