THE MclNTOSH MC 2100 SOLID STATE STEREO POWER

THE MclNTOSH MC 2100 SOLID STATE STEREO POWER
THE MclNTOSH MC 2100 SOLID STATE STEREO POWER AMPLIFIER
Price $1.25
Your MC 2100 stereo amplifier will
give you many years of pleasant
and satisfactory performance. If
you have any questions concerning
operation or maintenance please
contact the dealer from whom
you purchased this instrument or:—
CONTENTS
GUARANTEE . . . 1
INSTALLATION . . . 2
HOW TO CONNECT . . . 2, 3
CUSTOMER SERVICE
Mclntosh Laboratory Inc.
2 Chambers Street
Binghamton, New York 13903
Phone: 607-723-3512
CONTROL PANEL INFORMATION . . . 4
LISTENING TO YOUR STEREO SYSTEM . . . 5
PERFORMANCE LIMITS . . . 5
PERFORMANCE CHARTS . . . 6
Take Advantage of 3 years
TECHNICAL DESCRIPTION . . . 7
o f FREE Factory Service . . .
Fill in the Application N O W .
BLOCK DIAGRAM . . . 8
GUARANTEE
Mclntosh Laboratory Incorporated guarantees this
Instrument to be capable of performance as advertised. We also guarantee the mechanical and electrical workmanship and components to be free of
defects for a period of 90 days from date of purchase. If such defects occur, Mclntosh Laboratory
or 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 FACTORY
SERVICE CONTRACT is included with this manual.
The terms of the contract are:
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.
For Three Years from date of purchase —
1. Mclntosh will provide all parts, materials and
labor needed to return the measured performance
of the instrument to the original performance
limits free of any charge. The SERVICE CONTRACT does not cover any shipping costs to and
from the authorized service agency or the factory.
5. The SERVICE CONTRACT is given to purchasers
who live in the 50 United States or Canada only.
6. For your protection Mclntosh selects its dealers
carefully. Only one dealer in ten qualifies for a
Mclntosh franchise. To receive the SERVICE
CONTRACT your purchase must be made from a
Mclntosh franchised dealer.
2. Any Mclntosh authorized service agency will repair all Mclntosh 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.
7. Your completely filled In application for a SERVICE CONTRACT must be postmarked within 30
days of the date of purchase of the instrument.
8. To receive the SERVICE CONTRACT all information on the application must be filled in. The
SERVICE CONTRACT will be issued when the
completely filled in application Is received at
Mclntosh Laboratory Incorporated In Binghamton,
New York. If the application is not received at
Mclntosh Laboratory, only the service offered
under the 90-day guarantee will apply.
3. Always have service done by a Mclntosh authorized service agency. If the instrument is modified
or damaged, as a result of unauthorized repair the
SERVICE CONTRACT will be cancelled. Damage
by improper use or mishandling is not covered by
the SERVICE CONTRACT.
1
Copyright © 1972 By Mclntosh Laboratory Inc.
SPEAKERS
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. Connect one of the leads from
the left loudspeaker to the screw marked COM on the
LEFT OUTPUT barrier strip. Connect the other lead
from the left loudspeaker to the screw marked with the
number corresponding to the speaker impedance on
the LEFT OUTPUT barrier strip. Connect one of the
leads from the right loudspeaker to the screw marked
COM on the RIGHT OUTPUT barrier strip. Connect the
other lead from the right loudspeaker to the screw
marked with the number corresponding to the speaker
impedance on the RIGHT OUTPUT barrier strip.
The only adverse effect on the operation of a
Mclntosh 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.
INSTALLATION
Adequate ventilation extends the trouble-free
life of electronic instruments. It is generally found
that each 10° centigrade (18° F) rise in temperature reduces the life of electrical insulation by one
half. Adequate ventilation is an inexpensive and
effective means of preventing insulation breakdown that results from unnecessarily high operating temperatures. The direct benefit of adequate
ventilation is longer, trouble-free life.
The suggested minimum space for mounting the
MC2100 is 20 inches deep x 9½ inches high x 12
inches wide. 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 MC2100 be mounted
in a normal or horizontal position. However with
adequate ventilation, the amplifier can be mounted
in any position except upside down. If the amplifier is to be installed on a vertical surface it is
recommended that the autoformers be on the
down side. This position permits greater air flow
around the transistors and component parts thereby extending the trouble-free life of the amplifier.
SPEAKER CONNECTIONS
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 to 13 ohms
8 ohms
13 to 26 ohms
16 ohms
HOW TO CONNECT
INPUT-STEREO
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. The INPUT
switch must be in the STEREO position and the OUTPUT properly connected to the stereo loudspeakers
or distortion and loss of power may result.
STEREO OUTPUT-CONNECTING TO BARRIER STRIPS
Use this table for stereo connections using the
barrier strips:
Connect one right
Connect one left speaker lead to
speaker to screw the screw marked
If the speaker
LEFT-COM and RIGHT-COM and
impedance is:
other to:
the other to:
4 ohms
LEFT-4
RIGHT-4
8 ohms
LEFT-8
RIGHT-8
16 ohms
LEFT-16
RIGHT-16
INPUT-MONO
The shielded cable from the program source is
plugged into the right jack. The INPUT switch must
be in the MONO position and the OUTPUT properly
connected for mono loudspeaker operation or distortion and loss of power may result.
For 25 volt line operation connect one of the left leads
to the screw marked COM on the LEFT OUTPUT
barrier strip. The other left lead is connected to the
screw marked 8 on the LEFT OUTPUT barrier strip.
Connect the right leads in the same manner on the
RIGHT OUTPUT barrier strip.
OUTPUT-STEREO OR TWIN AMPLIFIERS
For stereo or twin channel operation it is not necessary to use the same impedance loudspeaker on
each output. Simply connect each channel for the
impedance desired.
When connected as above the MC 2100 operates as a
105 watt per channel stereo amplifier.
2
MONOPHONIC OUTPUT—CONNECTING TO
BARRIER STRIPS
If the
impedance is:
When the NIC 2100 is to operate as a monophonic
amplifier, the two channels are combined to produce a
single 210 watt output. This chart lists the proper connections and interconnections for monophonic operation.
Solder the left
channel leads
between:
4 ohms
Pin
8 ohms
Pin
16 ohms
Pin
For constant voltage
25 volts
Pin
If the
speaker
impedance
is:
Connect one speaker
lead to the screw
Connect a
marked LEFT-COM wire between:
and the other to:
LEFT-4 and
2 ohms
LEFT-4
RIGHT-4
LEFT-8 and
RIGHT-8
4 ohms
LEFT-8
LEFT-16 and
RIGHT-16
8 ohms
LEFT-16
For constant voltage
LEFT-8 and
25 volts
LEFT-8
RIGHT-8
Solder the right
Channel leads
between:
1 and 2
1 and 3
1 and 4
Pin 5 and 6
Pin 5 and 7
Pin 5 and 8
1 and 3
Pin 5 and 7
When connected as outlined the MC 2100 operates as
a 105 watt per channel stereo amplifier.
MONOPHONIC OUTPUT—CONNECTING
TO THE OCTAL SOCKET
If the
Solder the
impedance is:
leads to:
CONNECT
1 and 2
2 ohms
2 and 6
1 and 3
3 and 7
4 ohms
1 and 4
8 ohms
4 and 8
1 and 4
4 and 8
25 volts
When connected as above the MC 2100 operates as a
210 watt per channel monophonic amplifier.
When connected as outlined the MC 2100 operates as
a 210 watt monophonic amplifier.
STEREO OUTPUT—CONNECTING TO
THE OCTAL SOCKET
The octal socket marked OUTPUT can be used for all
of the output impedances and voltages. Connections
are made in the following fashion:
AC POWER:
The power requirement for the MC2100 is 117 to 130
volt, 5 0 / 6 0 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.
3
CONTROL PANEL INFORMATION
INPUT
The input of the MC 2100 has a two position switch
to permit the amplifier to be used in any one of three
ways:
(1) As a monophonic 210 watt amplifier.
(2) As twin 105 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. The input impedance is 200,000 ohms.
In the STEREO position each input is controlled by
a GAIN control. The GAIN control allows signal
sources of 0.5 volt up to 30 volts to be connected without overloading the input to the amplifier.
The MONO position of the input switch parallels the
inputs of both amplifiers. When the outputs are properly connected the MC 2100 becomes a 210 watt monophonic amplifier. The RIGHT/MONO GAIN control permits connecting signal sources up to 30 volts without
overloading the amplifier's input. To operate the MC
2100 as a 210 watt monophonic amplifier the INPUT
switch must be in the MONO position and the OUTPUT
must be properly connected for monophonic operation.
4
OUTPUT
The two barrier terminal strips marked LEFT OUTPUT and RIGHT OUTPUT provide stereo connections
for the normal speaker impedances of 4 ohms, 8 ohms,
and 16 ohms, or monophonic operation connections
for 2 ohms, 4 ohms, and 8 ohms. The terminal strips
may also be connected for a constant voltage output
of 25 volts in either stereo or mono.
OUTPUT (Octal Socket)
The octal socket marked OUTPUT has stereo connections for 4 ohms, 8 ohms, 16 ohms, and 25 volts.
For monophonic operation the octal socket provides
connections for 2 ohms, 4 ohms, 8 ohms, and 25 volts.
FUSE
The MC 2100 uses a 5 ampere slo-blo type fuse. The
auxiliary AC outlet is not fused.
AC OUTLET
The auxiliary AC outlet can be used to supply power
to other equipment in the system. The outlet will provide a maximum of 300 watts of power. The AC outlet
is not fused.
LINE VOLTAGE
The MC 2100 operates on any line voltage between
117 volts and 130 volts, 50 to 60 Hz.
LISTENING TO YOUR STEREO SYSTEM
in the room is about as loud as you like to listen. Then
turn the GAIN control on the RIGHT INPUT until it is
equally as loud as the left channel. The system is now
balanced for loudness and provides the greatest range
of operation and loudness change when using the volume control on the source equipment.
NOW SIT BACK AND ENJOY YOUR MclNTOSH
SETTING THE GAIN CONTROLS:
To set the GAIN controls for a stereo system use a
monophonic signal from the program source. A monophonic signal supplies the same voltage to both channels. Turn the volume control on the source equipment
to the 12 o'clock position {half rotation).
Turn up the LEFT GAIN control until the loudness
PERFORMANCE LIMITS
Performance Limits are the maximum deviation from
perfection permitted for a Mclntosh instrument. We
promise you that the MC 2100 you buy must be capable
of performance at or exceeding these limits or you get
your money back. Mclntosh is the only manufacturer
that makes this guarantee.
OUTPUT IMPEDANCE
STEREO 4, 8, and 16 ohms
MONO 2, 4, and 8 ohms
OUTPUT VOLTAGES
25 volts STEREO and MONO
DAMPING FACTOR
20 at 4 ohms output
14 at 8 ohms output
11 at 16 ohms output
POWER OUTPUT
STEREO: 105 watts continuous, per channel, both
channels operating, which is:
20.5 volts RMS across 4 ohms
29.0 volts RMS across 8 ohms
41.0 volts RMS across 16 ohms
MONO—210 watts continuous, which is:
20.5 volts RMS across 2 ohms
29.0 volts RMS across 4 ohms
41.0 volts RMS across 8 ohms
HARMONIC DISTORTION
STEREO Will not exceed 0.25% at any power level
to 105 watts output per channel from 20 Hz to 20,000
Hz both channels operating. Typical performance is
less than 0.1% at rated power. Distortion decreases
as output power is reduced
MONO Will not exceed 0.25% at any power level
to 210 watts output from 20 Hz to 20,000 Hz. Typical
performance is less than 0.1% at rated power. Distortion decreases as output power is reduced
INPUT IMPEDANCE
200,000 ohms
INPUT SENSITIVITY
0.5 volt. Level control provided for higher input voltage
POWER REQUIREMENTS
120 volts 50/60 Hz, 50 watts at zero signal output
450 watts at rated output
SEMICONDUCTOR COMPLEMENT
32 silicon transistors
14 silicon rectifiers and diodes
MECHANICAL INFORMATION
SIZE: 7% inches high (19.69 cm), 11% inches wide
(29.85 cm), 17 inches deep (43.18 cm)
CHASSIS: Chrome and black.
WEIGHT: 57 pounds (25.86 kg) net, 63 pounds (28.58
kg) in shipping carton
INTERMODULATION DISTORTION
STEREO Will not exceed 0.25% if instantaneous
peak power is 210 watts or less per channel with
both channels operating for any combination of frequencies 20 Hz to 20,000 Hz
MONO Will not exceed 0.25% if instantaneous peak
power is 420 watts or less for any combination of
frequencies 20 Hz to 20,000 Hz
SPECIAL FEATURES
The amplifier is completely stable when connected
to any loudspeaker system or even to any reactive
loads. The MC 2100 has special circuits to prevent
damage by short circuit or open circuit of the output
loads, or by any amount of output impedance mismatch.
FREQUENCY RESPONSE
20 Hz to 20,000 Hz +0 -0.25 dB at rated power
15 Hz to 60,000 Hz +0 —0.5 dB at rated power
10 Hz to 100,000 Hz +0 - 3 . 0 dB at one-half rated
power
NOISE AND HUM
90 dB or more below rated output
Thermal cutouts are mounted on the output transistor heat sinks to provide protection in the event of
inadequate ventilation.
5
TECHNICAL DESCRIPTION
A two stage preamplifier with three transistors in
each channel increases the input voltage 16 dB.
There are 13 transistors in each 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 feedback 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.
match of the output. When your MC 2100 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. Only Mclntosh 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.
The output section is arranged as a series push-pull
amplifier. The power transistors used in the output
section of your MC 2100 are selected for their high
power dissipation capability, wide frequency response,
and large "safe operating area." In addition, each
power transistor is given four separate tests before it
is put in your MC 2100. This additional testing makes
sure your MC 2100 will deliver its rated power from
20 Hz to 20 kHz with low distortion and complete reliability.
The power transistors are mounted on oversized
anodized heat sinks. The heat sinks assure that under
normal operation the transistors will operate at a low
temperature. If temperatures increase due to a shorted
speaker, or restricted ventilation, an automatic temperature sensing device turns off the MC 2100. The
device operates automatically at a preset temperature.
The MC 2100 will turn on again when the temperature
has returned to normal limits. This additional feature
gives your MC 2100 complete reliability under the most
extreme operating conditions.
The output stages are matched to the load by the
Mclntosh autoformer. The Mclntosh autoformer is carefully wound using Mclntosh trifilar winding and interleaving techniques. Trifilar winding and interleaving
gives the autoformers exceptional bandwidth. The
autoformers properly match the power transistors to
4, 8, and 16 ohm loads at all audio frequencies.
The use of the Mclntosh designed trifilar autoformer
makes the Mclntosh 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 Mclntosh
MC 2100.
Another of the advantages of the autoformers is the
25 volt output for a constant voltage distribution system. With the MC 2100 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 mis7
MclNTOSH LABORATORY INC.
2 CHAMBERS ST., BINGHAMTON, N. Y. 13903
607-723-3512
Design subject to change without notice.
Printed in U.S.A.
038-663
BE022004
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