THE McINTOSH MC 250 STEREO SOLID STATE POWER AMPLIFIER Reading Time: 20 Minutes Price $1.
Your MC 250 Stereo Amplifier will give you many years of pleasant and satisfactory performance. If you have any questions, please contact: CUSTOMER CONTENTS SERVICE SERVICE CONTRACT 1 Mclntosh Laboratory Inc. 2 Chambers Street Binghamton New York 13903 Phone: 607-723-3512 INSTALLATION 2 HOW TO CONNECT WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS UNIT TO RAIN OR MOISTURE.
SPEAKERS Installation Speakers are connected at the barrier strips marked OUTPUT on the sloped panel of the amplifier. Use lamp cord, bell wire, or wire with similar type of insulation to connect the speakers to the amplifier. For the normally short distances of under 50 feet between the amplifier and speaker, #18 wire or larger can be used. For distances over 50 feet between the amplifier and speaker use larger wire. The loudspeaker impedance is usually identified on the loudspeaker itself.
strip. Connect the right leads in the same manner on the RIGHT OUTPUT barrier strip. When connected as above the MC 250 operates as a 50 watt per channel stereo amplifier. MONOPHONIC OUTPUT— CONNECTING TO BARRIER STRIPS When the MC 250 is to operate as a monophonic amplifier, the two channels are combined to produce a single 100 watt output. This chart lists the proper connections and interconnections for monophonic operation.
control Panel Information INPUT The input of the MC 250 has a two position switch to permit the amplifier to be used in any one of three ways: (1) As a monophonic 100 watt amplifier. (2) As twin 50 watt amplifiers used with an electronic crossover network, or as two completely separate amplifiers. (3) As a stereo amplifier used with a Mclntosh preamplifier or other high output stereo program sources. In either position of the input switch the input sensitivity is 0.5 volts for full rated output.
Performance Limits and Ratings INTERMODULATION DISTORTION STEREO 0.25% if instantaneous peak power output is 100 watts or less per channel with both channels operating for any combination of frequencies 20 Hz to 20,000 Hz PERFORMANCE GUARANTEE Performance Limits are the maximum deviation from perfection permitted for a Mclntosh instrument. We promise you that the MC 250 you buy must be capable of performance at or exceeding these limits or you get your money back.
Technical Description A two stage preamplifier with three transistors in each channel increases the input voltage 16 dB. To further insure reliability a special power output SENTRY MONITORING CIRCUIT prevents failure of the power output transistors due to excessive mismatch of the output. When your MC 250 operates normally the SENTRY MONITORING CIRCUIT has no effect on signals passing through the power amplifier.
MCINTOSH LABORATORY INC. 2 CHAMBERS ST., BINGHAMTON, N. Y. 13903 607-723-3512 Design subject to change without notice. Printed in U.S.A.
