McIntosh MC-100 User's Manual
Contents
1. THE MC 100 SOLID STATE POWER AMPLIFIER jjfelnfosh 100 Your 100 Solid State Power Amplifier will give you many years of pleasant and satisfactory per formance If you have any questions concerning the operation or maintenance of this instrument please contact CUSTOMER SERVICE Mcintosh Laboratory Inc 2 Chambers Street Binghamton New York 13903 Phone 607 723 3512 Take Advantage of 3 years of FREE Factory Service Fill in the Application NOW 7 R ASS ANZ VE McIntosh Laboratory Incorporated guarantees this instrument to be capable of performance as adver tised We also guarantee the mechanical and elec trical workmanship and components to be free of defects for a period of 90 days from date of pur chase If such defects occur McIntosh Laboratory or GUARANTEE one of its authorized agencies will repair the defect at no cost to the purchaser This guarantee does not extend to components damaged by improper use nor does it extend to transportation to and from the factory or service agency THREE YEAR FACTORY SERVICE CONTRACT An application for a FREE THREE YEAR FAC TORY SERVICE CONTRACT is included with this manual The terms of the contract are For Three Years from date of purchase 1 McIntosh will provide all parts materials and labor needed to return the measured perform ance of the instrument to the original per formance limits free of any2. 13903 Tet 607 723 3512 amp Mcintosh Laboratory has great belief in its engineering product development manufacturing and quality control To offer you strong evidence of this confi dence Mcintosh offers you a FREE THREE YEAR SERVICE CONTRACT During the first three years you can t spend one dime for service Mcintosh guarantees labor It costs you nothing The extended life of a Mcintosh the conservative ratings and the sophisti 5 cated appearance make Mcintosh strument greater value when you ready to trade Welntosh McINTOSH LABORATORY INC 2 CHAMBERS ST BINGHAMTON N Y 13903 607 723 3512 Design subject to change without notice Printed in U S A 038 366
3. ONV AlddNS Y3MOd HAWHOJSNVUL H3MOd AYUOML3N 5 18 dWV LONI 3NI dWV dWWV 3Hd NIVO O INdNI 5 FIRST PROTECTION In these dark days of hurry up percentage analy sis production rush and limited personal responsi bility the Mcintosh policy of Performance Limits is a bit of bright blue sky Every Mcintosh instrument every one is tested to be equal to or better than the performance limits advertised When a performance limit of 0 20 harmonic distortion is established for an instrument McIntosh means that every each all of the instruments manufactured must be capable of performance to that limit or better or your fuli purchase price 15 refunded One of the reasons Mcintosh can make this prom ise is we 100 test every product for maximum per formance We are not content knowing that 10 of our products are tested and meet the performance requirements established by our engineering group We must know that every one meets its requirements This vigorous pursuit of excellence takes time At McIntosh more time means more care more protec tion for you There s no production rush at Mcintosh The Mcintosh investment in professional testing instruments is staggering On a percentage basis McIntosh probably invests more of its sales dollars in te
4. charge The SERVICE CONTRACT does not cover any shipping costs to and from the authorized service agency or the factory Any Mcintosh authorized service agency will repair all instruments at normal service rates To receive the free service under the terms of the SERVICE CONTRACT the SERVICE CONTRACT CERTIFICATE must accompany the instrument when taken to the service agency Always have service done by a Mcintosh authorized service agency If the instrument is modified or damaged as a result of unau thorized repair the SERVICE CONTRACT will be cancelled yright 1970 By Mcintosh Laboratory Inc 4 The SERVICE CONTRACT is issued to you as the original purchaser To protect you from misrepresentation this contract cannot be transferred to a second owner The SERVICE CONTRACT is given to pur chasers who live in the 50 United States or Canada only For your protection selects its dealers carefully Only one dealer in ten qualifies for a McIntosh franchise To receive the SERVICE CONTRACT your purchase must be made from a Mcintosh franchised dealer Your completely filled in application for a SERVICE CONTRACT must be postmarked within 30 days of the date of purchase of the instrument To receive the SERVICE CONTRACT all infor mation on the application must be filled in The SERVICE CONTRACT will be issued when the completely filled in application is received at McIntosh Laboratory Incorporated
5. short circuit or open circuit of the output loads or by any amount of output impedance mis match Thermal cutouts are mounted on the output transis tor heat sinks to provide protection in the event of inadequate ventilation gm eriormance harts PER CENT HARMONIC DISTORTION 10 100 POWER OUTPUT IN WATTS RMS A YN gt r 2 e LU 2000 FREQUENCY IN HERTZ PER CENT INTERMODULATION DISTORTION 10 100 POWER OUTPUT EQUIVALENT WATTS RMS Technical Description A two stage preamplifier with three transistors in creases the input voltage 16 db There are 13 transistors in the power amplifier section The two stage preamplifier is fed to a pair of matched transistors arranged as an emitter coupled amplifier with two inputs and one output The signal from the preamplifier section connects to one of these inputs Both AC and DC negative feedback are applied to the other input This large quantity of feed back is used to reduce noise and distortion The signal is then fed to a voltage amplifier The voltage amplifier is followed by two driver transistors The output section is arranged as a series push pull amplifier The power transistors used in the out put section of your MC 100 are selected for their high power dissipation capability wide frequency re sponse and large 5 operating area In addition each power transistor is given four separ
6. ate tests be fore it is put in your MC 100 This additional testing makes sure your MC 100 will deliver its rated power from 20 Hz to 20 000 Hz with low distortion and com plete reliability The power transistors are mounted on oversized anodized heat sinks The heat sinks assure that un der normal operation the transistors will operate ata low temperature If temperatures increase due to a shorted speaker or restricted ventilation an auto matic temperature sensing device turns off the power to the 100 The device operates automatically at a preset temperature The MC 100 will turn on again when the temperature has returned to normal limits This additional feature gives your MC 100 complete reliability under the most extreme operating con ditions The output stages are matched to the load by the Mcintosh autoformer The Mcintosh autoformer is carefully wound using McIntosh trifilar winding and interleaving techniques Trifilar winding and inter leaving gives the autoformers exceptional band width The autoformers properly match the power transistors to 4 8 and 16 ohm loads at all audio frequencies The use of the Mcintosh designed trifilar auto former makes the McIntosh solid state amplifiers the only amplifiers that deliver FULL POWER AT ALL SPEAKER IMPEDANCES You have not been power penalized for your choice of loudspeakers when using the McIntosh MC 100 Another of the advantages of the autoformers is the 25 volt outp
7. in Bing hamton New York If the application is not at Mcintosh Laboratory only the service offered under the 90 day guarantee will apply Adequate ventilation extends the trouble free life of electronic instruments It is gen erally found that each 10 centigrade 18 F rise in temperature reduces the life of elec trical insulation by one half Adequate ven tilation is an inexpensive and effective means of preventing insulation breakdown that re sults from unnecessarily high operating tem peratures The direct benefit of adequate ventilation is longer trouble free life The suggested minimum space for mount ing the MC 100 is 16 inches long X 8 inches wide 10 inches high Always allow for air flow by either ventilation holes or space next to the bottom of the amplifier and a means for the warm air to escape at the top It is recommended that the MC 100 be mounted in a normal or horizontal position However with adequate ventilation the ampli fier can be mounted in any position except upside down If the amplifier 15 to be installed on a vertical surface it is recommended that the autoformer be on the down side This position permits greater air flow around the transistors and component parts extending the trouble free life of the amplifier How to Connect INPUT The input sensitivity of the MC 100 is 0 5 volt for 100 watts output The input impedance is 200 000 ohms There is a GAIN con
8. ne operation connect one of the leads to the screw marked COM on the OUTPUT barrier strip The other lead is connected to the screw marked 8 on the OUTPUT barrier strip AC POWER The MC 100 operates on 105 volt to 130 volt 50 to 60 Hz The amplifier will be turned on and off if its power cord is plugged in one of the auxiliary AC power outlets on the program source FUSE The MC 100 is fused with a slo blo type fuse rated at 2 5 amperes For maximum protection always re place with fuses of the same rating never larger The AC power outlet on the MC 100 is not fused Adjustments For maximum flexibility set the amplifier gain con trol as follows turn the volume control on the pro gram source equipment i e tape recorder tuner preamplifier etc to the 12 o clock position Turn the gain control on the MC 100 until the loudness of the sound from the speaker is just a little louder than you normally like to listen The volume control on the program source equipment now has the most con venient amount of loudness change in either direc tion from the 12 o clock position Performance Limits Performance Limits are the maximum deviation from perfection permitted for a Mcintosh instrument We promise you that the MC 100 you buy must be capable of performance at or exceeding these limits or you get your money back Mcintosh is the only manufacturer that makes this guarantee POWER OUTPUT 100 RMS watts c
9. ontinuous into 4 8 or 16 ohms HARMONIC DISTORTION Will not exceed 0 2 at any power level to 100 watts output from 20 Hz to 20 000 Hz Typical per formance is less than 0 1 at rated power Distortion decreases as output power is reduced INTERMODULATION DISTORTION Will not exceed 0 2 if instantaneous peak power is 200 watts or less for any combination of frequen cies 20 Hz to 20 000 Hz FREQUENCY RESPONSE 20 Hz to 30 000 Hz 0 0 1 dB at rated power 10 Hz 50 000 Hz 0 0 5 db at rated power 7 Hz to 100 000 Hz 0 3 0 db at one half rated power NOISE AND HUM 90 db or more below rated output OUTPUT IMPEDANCE 4 8 and 16 ohms OUTPUT VOLTAGE 25 volts from 8 ohm tap DAMPING FACTOR 29 at 4 ohms output 16 at 8 ohms output 12 at 16 ohms output INPUT IMPEDANCE 200 000 ohms INPUT SENSITIVITY 0 5 volt Level control provided for higher input voltage POWER REQUIREMENTS 117 volts 50 60 Hz 40 watts at zero signal output 230 watts at rated output SEMICONDUCTOR COMPLEMENT 16 silicon transistors 10 silicon rectifiers and diodes MECHANICAL INFORMATION SIZE 6 inches high 94 inches wide 14 inches deep CHASSIS Chrome and black WEIGHT 32 pounds net 38 pounds in shipping carton SPECIAL FEATURES The amplifier is completely stable when connected to any loudspeaker system or even to any reactive loads The MC 100 has special circuits to prevent damage by
10. sting facilities that anyone else in a like busi ness For instance McIntosh has one professional distortion analyzer for every 10 employees This kind of statistic is repeated for all sorts of test instru ments As new testing instruments are produced that update the Mcintosh ability to know Mcintosh in vests in them wave form analyzers real time ana lyzers lowest distortion signal generators etc etc Even so far as a small FM transmitter so that the entire transmission reception system can be ana lyzed What does this mean to me you ask Only through this impressive investment through con tinuous testing and research through product analy sis and endless measurement can we promise and deliver to you reliability long life performance high est value and freedom from service SECOND PROTECTION em Ban nn gt McIntosh VENA FACTORY SERVICE GONTRAGI BECAUSE McINTOSH MANUFACTURES THE BEST ELECTRONIC MUSIC REPRODUCING INSTRUMENTS AND BECAUSE McINTOSH INSTRUMENTS ARE DESIGNED TO HAVE LONG TROUSLE FREE LIFE AND BECAUSE MCINTOSH WANTS TO ASSURE YOU THAT YOU OWN THE FINEST INSTRU MENT MADE McINTOSH LABORATORY ISSUES THIS THREE YEAR CONTRACT TO Name Street City State Zip MODEL NO _ BR nn Agent ar th shipgeng costs w and Nom the aucorred 71 Melntosh 2772 n 05 LABORATORY INC 2 Chambers Street Binghamton New York
11. trol in the input circuit to permit the use of input voltages up to 30 volts The input jack marked 0 5 VOLT INPUT is located below the GAIN control Plug the shielded lead from the program source in the INPUT jack OUTPUT 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 be tween 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 Connect one of the leads from the 2 loudspeaker to the screw marked COM on the OUT PUT barrier strip Connect the other lead from the loudspeaker to the screw marked with the number corresponding to the speaker impedance on the OUTPUT barrier strip The only adverse effect on the operation of a Mc Intosh amplifier when it is improperly matched is a reduction in the amount of distortion free power available to the loudspeaker Close impedance matching is desirable for maximum distortion free power SPEAKER CONNECTIONS Use this table to determine proper speaker con nection Connect the speaker leads between COM and If the speaker impedance is between 3 2 to 6 5 ohms 4 ohms 6 5 to 13 ohms 8 ohms 13 to 26 ohms 16 ohms For 25 volt li
12. ut for a constant voltage distribution system With the MC 100 several sets of speakers can be operated independently throughout your home To further insure reliability a special power output SENTRY MONITORING CIRCUIT prevents failure of the power output transistors due to excessive mis match of the output When your MC 100 operates normally the SENTRY MONITORING CIRCUIT has no effect on signals passing through the power ampli fier If the power dissipation should rise above nor mal operation the SENTRY MONITORING CIRCUIT restricts the drive to the output transistors The SENTRY MONITORING CIRCUIT acts instantaneous ly for any input signal or load combination This ar rangement assures complete circuit reliability Only McIntosh gives you this degree of protection There are three separate power supply sections One positive and one negative high current supply is used for the output stages The other positive supply is used for the driving amplifier stages All supplies are full wave and use silicon rectifiers Adequate filtering is used to assure an absolute minimum of hum The power output stage filter capacitors have very high capacity which allows full power output below 20 Hz The power transformer is generous in size and runs cool even under heavy use 1NALNO YIAVIAS Block Diagram WOO O Up Us HAWHOJOLNV 39715 1149110 8 55772 ESHS H 39715 LNdLNO 8 55772 M3AIMO YIYO
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