best performance greatest musical satisfaction longest protection

best performance greatest musical satisfaction longest protection
BEST PERFORMANCE
GREATEST MUSICAL SATISFACTION
LONGEST PROTECTION
HIGHEST RELIABILITY
RIGOROUS QUALITY CONTROL
METICULOUS MANUFACTURE
PAINSTAKING ENGINEERING
LONG LIFE STYLING
HIGHEST VALUE AT TRADE TIME
McINTOSH LABORATORY INC., 2 CHAMBERS STREET, BINGHAMTON, NEW YORK 13903
McINTOSH PROTECTION
FIRST PROTECTION....
In these dark days of hurry up - percentage analysis
- production rush - and limited personal responsibility
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 0.02% 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 full
purchase price will be refunded.
Here is one of the reasons McIntosh can make this
promise: at McIntosh every product is 100% tested
for maximum performance. 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 rigorous pursuit of excellence
takes time. At McIntosh more time means more care,
more protection 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 testing
facilities than anyone else in a like business. For instance, McIntosh has one professional distortion analyzer for every 10 employees. This kind of statistic
is repeated for all sorts of test instruments. As new
testing instruments are produced that update the
McIntosh ability to know, McIntosh invests in them - wave form analyzers - real time analyzers - lowest distortion signal generators - etc., etc. Even an FM
transmitter so that the entire transmission/reception
system can be analyzed.
"What does this mean to me?" you ask. Only
through this impressive investment; through continuous testing and research; through product analysis;
and endless measurement can we promise and deliver
to you reliability, long life, performance, highest value,
and freedom from service.
SECOND PROTECTION...
Mclntosh Laboratory has great belief in its engineering, product development, manufacturing and quality
control. To offer you strong evidence of this confidence Mclntosh offers you a FREE S E R V I C E CONTRACT. During the life of the contract you can't
spend one dime for service. Mclntosh guarantees
tabor. It costs you nothing. The extended life of a
Mclntosh, the conservative ratings, and the sophisticated appearance make a Mclntosh instrument a
greater value when you are ready to trade. Step up to
Mclntosh now.
TABLE OF CONTENTS
MCINTOSH CARES ABOUT YOU
2-3
FM DIRECTORY
4-11
MCINTOSH AUDIO DIVISION
RECEIVERS
MAC 1900 . . 12-14
MCINTOSH LOUDSPEAKER DIVISION
THE SOUND OF REALITY
ML 1 C
ML2C
ML4C . . . . . .
15
16
16
17
M L 2 M .. . . . 1 6
ML 1 0 C . . . . . 16
ENVIRONMENTAL
EQUALIZERS
MCINTOSH LABORATORY
PREAMPLIFIERS
REMOTE CONTROL
RELAY
MQ 101
MQ102
C 26
C 28
18
18
19
20-21
SCR 2
21
MAXIMUM PERFORMANCE
INDICATOR
MPI 4
22-23
TUNERS
MR 78
MR 77
MR 74
TUNER-PREAMPLIFIER
24-25
26
27
MX 1 1 3 . . . . 2 8 - 2 9
PREAMPLIFIER-AMPLIFIER
COMBINATION
MA 6100
30
MONOPHONIC
AMPLIFIER
32
POWER
STEREO POWER
AMPLIFIERS
MC50
MC 250
33
MC 2100
33
MC 2505
34
MC 2105
34
MC 2300 . . . . . 35
STATION LOG
Prices and designs subject
to change without notice
36
THE BEST STEREO
Tune weak, distant stations next to
strong local stations easier. A seven
section variable capacitor is the heart
of the RF section. Four sections are
used for FM and three for AM. By
interleaving (FM-AM-FM-AM, etc.)
spurious responses are significantly
reduced and selectivity is substantially improved.
Excelient flexibility makes the MAC
1900 easier to set up. Pushbuttons
are provided for your choice of any
mode of operation. Use two tape
recorders, 3 stereo speaker systems,
seven modes of operation plus loudness compensation, muting, high and
low filters,
Each channel of the preamplifier is
assembled on a plug-in high grade,
low noise printed circuit card, A large
quantity of negative feedback around
the phono amplifier reduces noise
and distortion and provides precision
R I A A compensation for records.
A new McIntosh engineering development has produced an AM circuit that
has equal sensitivity across the entire
band. Selectivity and image rejection
have been maximized across the band.
A patent application has been made
for this new and superior AM tuner
circuit.
Use and hear AM as never before. The
MAC 1900 has a high quality loopstick AM antenna. It can be rotated
for maximum performance, optimum
signal reception and minimum interference. Each MAC 1900 loopstick is
tuned for optimum performance. Custom matching maximizes performance. You can mount the receiver in
any position without the sacrifice
of sensitivity.
FM
A dual insulated gate metal oxide silicon field effect
transistor (MOS-FET) is used as the first and second RF
amplifier. The MOS-FET greatly reduces the cross-modulation products over a wider dynamic range. Wider
dynamic range permits acceptance of up to 12 RF volts
without overload or increased distortion!
The dual QUAD-TUNED IF filter has unusual adjacent
channel selectivity and low distortion. The QUAD-TUNED
IF filter has equal time delay in its pass band region. All
other IF filters have delay distortion, as much as 100% of
the 10.7 MHz transit delay. The MAC 1900 has less than
1.0% delay distortion from antenna input to discriminator
output! You get overall lower distortion performance.
A particular advantage of the McIntosh multiplex circuit
is the elimination of the critical adjustment in commonly
used circuits. The L—R sidebands are detected then automatically matrixed with the L+R carrier. This yields the
left and right program with maximum separation!
Ultrasonic muting makes FM tuning easier. FM muting
operates by detecting ultrasonic noise which is present between stations or when receiving a weak station.
AM
The NEW, superb AM circuit design has linear sensitivity
and linear frequency response over the entire AM band.
The NEW AM circuit has high sensitivity and excellent dynamic range. The NEW AM circuit will not be overloaded
by strong local stations yet is sensitive enough to receive
distant and weak stations with minimum noise. Response
has been carefully tailored to deliver maximum quality
with minimum noise.
The high sensitivity ferrite loopstick antenna is carefully tuned and trimmed to match each MAC 1900. After
the individual matching process, the antenna is sealed to
preserve the superior performance introduced by individualized matching. McIntosh has revived the lost art of designing superb AM.
PREAMPLIFIER
The preamplifier is an outstanding example of what
the electronic designers have done to provide for highest
quality with great flexibility in a space limited housing. It
has unusually low noise and low distortion. For instance,
you can play, record, and monitor on two tape recorders.
POWER AMPLIFIER
There's more real power and more
protection. The power transistors are
mounted on oversized black anodized
heat sinks. Under normal operation
the transistors will operate at low
temperature. The power transistors
used in the output circuits are selected for their high power dissipation
capability, wide frequency response
and large "safe operating area."
12
The low distortion and stability of the MAC 1900 power
amplifier circuit allows it to be used with any dynamic or
electrostatic speaker system. McIntosh output circuit with
instantaneous current limiting totally protects you. This
reserve power and complete protection allows safe operation with as many as three pairs of speakers, individually
or all together! You have front panel switching for three
stereo loudspeaker systems of any type!
RECEIVER IS THE
you get more value
you get more protection from service costs
you get more electronic protection
you get more real power
you get more useful flexibility
you get more results from new technology
you get more pure pleasure
AM-FM/FM STEREO R E C E I V E R
Shown in walnut veneer cabinet
TWO YEAR
S E R V I C E CONTRACT
To make the value even greater, buy a McIntosh Audio product and get a free 2 YEAR
SERVICE CONTRACT! An outstanding feature of the McIntosh
Service Contract is the protection
you get. Normal wear and tear as
well as any manufacturing defect costs you nothing.
Read about the
Guaranteed
Performance
of the
13
MAC 1900
Performance Limits
FM
PREAMPLIFIER AND POWER AMPLIFIER
McIntosh audio power ratings are in accordance
with the Federal Trade Commission Regulation of
November 4, 1974 concerning power output claims
for amplifiers used in home entertainment products.
POWER OUTPUT:
55 watts minimum sine wave continuous average
power output, per channel, both channels operating into 8 ohms load impedance, which is:
21.0 volts RMS across 8 ohms
30 watts minimum sine wave continuous average
power output, per channel, both channels operating into 16 ohms load impedance, which is:
21.9 volts RMS across 16 ohms
40 watts minimum sine wave continuous average
power output, per channel, both channels operating into 4 ohms load impedance, which is:
12.65 volts RMS across 4 ohms
OUTPUT LOAD IMPEDANCE:
4 ohms, 8 ohms, or 16 ohms
RATED POWER BAND:
20 Hz to 20,000 Hz
TOTAL HARMONIC DISTORTION:
0.2% maximum harmonic distortion at any power level from 250 milliwatts to rated power per
channel from 20 Hz to 20,000 Hz, both channels
operating
INTERMODULATION DISTORTION:
0.2% if instantaneous peak power output is t w i c e rated continuous average power or less per channel with both channels operating for any combination of frequencies 20 Hz to 20,000 Hz
FREQUENCY RESPONSE: (at one watt Output)
20 Hz to 2 0 , 0 0 0 Hz +0.5 -0.5 dB
NOISE AND HUM:
Power Amplifier: 95 dB below rated output
Tape Input: 90 dB below rated output
Phono Input: 76 dB below 10 rnV input
DAMPING FACTOR:
56 at 8 ohms output
112 at 16 ohrns output
INPUT SENSITIVITY AND IMPEDANCE:
Power Amplifier: 2.5 volts, 1 0 0 , 0 0 0 ohms
Phono 1 and Phono 2 : 2.0 mV, 47,000 ohms
Tape 1 and Tape 2: 2 5 0 mV, 2 5 0 , 0 0 0 ohms
TAPE OUTPUT:
Tuner: 1.0 volt at 100% modulation (FM)
Tape: 250 mV with rated input at 500 Hz
Phono: 1.2 volts with 1 0 mV input at 1 0 0 0 Hz
BASS CONTROLS:
±16 dB at 2 0 , 0 0 0 Hz
TREBLE CONTROLS:
±16 dB at 2 0 , 0 0 0 Hz
L.F. FILTER:
Active filter, 1 2 dB per octave roll off below 50 Hz, down 18 dB
at 20 Hz
H.F. FILTER:
Active filter, 12 dB per octave roll off above 7,000 Hz, down
13 dB at 2 0 , 0 0 0 Hz
SIGNAL TO NOISE R A T I O :
70 dB below 100% modulation
HARMONIC DISTORTION:
Mono: Does not exceed 0 . 3 % at 100% modulation ± 7 5 kHz deviation; Stereo: Will not exceed 0.7%
AUDIO FREQUENCY RESPONSE:
±1 dB 20 Hz to 15,000 Hz with standard de-emphasis (75mS)
and 19,000 Hz pilot filter
CAPTURE RATIO:
1.8 dB
SELECTIVITY:
55 dB alternate channel selectivity minimum
SPURIOUS REJECTION:
90 dB minimum
IMAGE REJECTION:
80 d B ; 8 8 to 108 MHz (IHF)
STEREO SEPARATION:
34 dB at 1 ,000 Hz
SCA FILTER:
50 dB rejection from 67 kHz to 74 kHz, 2 7 5 dB per octave slope
FACILITIES AND FEATURES
BASS:
Slide control with mechanical detent for flat — 1 6 dB to +16 dB
at 20 Hz
TREBLE:
Slide control w i t h mechanical detent for flat — 1 6 dB to +16 dB
at 2 0 , 0 0 0 Hz
LOUDNESS:
Pushbutton . . , for loudness compensation or f l a t response
BALANCE:
Natural balance at center position, attenuation of left or right
channel by rotating control
VOLUME:
Precision "tracked" at all listening levels. (0 to — 6 5 dB) Does
not change stereo balance as loudness is changed. The AC power
ON/OFF switch is coupled with this control.
INPUT:
Six positions—TAPE 1, TAPE 2, AM, FM, PHONO 1 and
PHONO 2
MODE:
Pushbutton—Left channel only to both speakers. Right channel
only to both speakers, Stereo Reverse, Stereo, Mono: (L+R),
L+R to right speaker only, and L+R to left speaker only
TAPE MONITOR:
Two pushbutton switches. Either of two tape recorders can be
monitored by selecting the T A P E MONITOR 1 pushbutton or
TAPE MONITOR 2 pushbutton. They are mechanically interlocked to accept only one pushbutton at the IN position at one
time
SPEAKER:
Main—Switch the MAIM loudspeaker system ON or OFF without
affecting the performance of REMOTE speakers.
Remote 1 —Switch one REMOTE loudspeaker system ON or OFF
without affecting the performance of MAIN speakers.
Remote 2 — S w i t c h a second REMOTE loudspeaker system ON or
OFF without affecting the performance of MAIN speakers.
HEADPHONE JACK:
For listening with low impedance dynamic stereo headphones
GENERAL
POWER REQUIREMENTS:
120 volts, 5 0 / 6 0 Hz, 40 w a t t s at zero signal output, 300 watts at
rated output
SEMICONDUCTOR COMPLEMENT:
5 3 silicon field e f f e c t of bipolar transistors
3 integrated circuits
4 thyrisistors
39 silicon rectifiers ana diodes
MECHANICAL
AM
SENSITIVITY:
75 mV (external ant.)
SIGNAL TO NOISE RATIO:
45 dB minimum; 55 dB at 1 0 0 % modulation
HARMONIC DISTORTION:
Will not exceed 1% at 30% modulation
ADJACENT CHANNEL S E L E C T I V I T Y :
30 dB minimum
IMAGE REJECTION:
65 dB minimum, 540 kHz — 1600 kHz
14
USEABLE SENSITIVITY:
2.5 microvolts at 1 0 0 % modulation ( ± 7 5 kHz deviation) for 3%
total noise and harmonic distortion
SIZE:
Front panel measures 16 inches wide ( 4 0 . 6 4 cm) by 5 - 1 / 2
inches high ( 1 3 . 9 7 cm). Chassis measures 15 inches wide ( 3 8 . 1
cm) by 5-1/8 inches high (1 3.02 cm) by 15 inches deep (38.1 cm)
including back panel connectors. Knob clearance required is
1 -1/2 inches ( 3 . 8 1 cm) in front of the mounting panel
FINISH:
Front panel is anodized gold w i t h black
WEIGHT:
33 pounds (14.97 kg) net 46 pounds (20.87 kg) in shipping
carton
From the LOUDSPEAKER SCIENTISTS at
THE SOUND of REALITY
WHAT IS THE MEASURE OF A LOUDSPEAKER?
A loudspeaker is a "sound imaging" device much the same
as a photograph is a "visual imaging" device. You measure
the excellence of a photograph by judging the coincidence of
the visual image with reality. You measure the excellence of
a loudspeaker by judging the coincidence of the sound image
with reality. After considering both the reality and the sound
image you make the ultimate judgment based on what you
hear. The most important thing a loudspeaker can do for
you is to sound right the first time you listen to it, the
next time you listen to it and every time you listen to it.
MAKING A REAL SOUND IMAGE
When you look in a perfectly flat mirror you will see an
accurate image of y o u r s e l f . If the mirror is bent then the accuracy of the image is altered. Mirrors can have other accuracy
problems. They can be tinted so that the color coincidence of
the object and the image is altered. In addition, the image may
correspond in shape and size for one color but be out of shape
or size for another color. Optical and sound imaging devices
have analogous problems. Considering these facts it is possible
to state the concept of image fidelity: the image should coin-
cide with the object in every detail. It should be no more nor
no less.
Applying the image fidelity concept to a sound system requires a statement like this: We should hear the original sound
- nothing subtracted - nothing added!
To the eternal credit of sound scientists and engineers most
of the links in the sound imaging chain have reached a high level
of perfection. The loudspeaker has been the last link in need
of an advancement to fidelity.
THE MCINTOSH PROMISE OF PERFORMANCE
A McIntosh Loudspeaker is a promise of a new psychoacoustic experience — the experience of reality in your listening room - - - the experience of listening to an almost perfect
sound image. From many man years of research, McIntosh
promises you nearly perfect sound images will occur in your
listening room - - - whatever the room is like! (See page 18 for
the McIntosh Environmental Equalizers.) They give you the
flexibility to properly match McIntosh loudspeakers to your
room. For the first time loudspeakers and electronics have been
designed together to give you near perfection in reproduction
in your listening room. To say it differently - - - if the actual
live or real sound would please you in your listening room
then the McIntosh loudspeaker in your listening room will
equally please you.
THE MCINTOSH PROMISE OF RELIABILITY
You have just read the McIntosh
Promise of Performance. Now - - read the McIntosh Promise of Reliability: each mechanism and each
crossover component is protected
by the McIntosh 5 Year Service
Contract - - - free.
15
McINTOSH is
THE SOUND OF REALITY
HERE'S BEAUTIFUL
ML 1C
1 - 1 0 " (25.4cm) Radiator - 12" (30.48cm)
Loudspeaker
1 - 5" (12.7 cm) Radiator - 8" (20.32 cml
Loudspeaker
11-1/2" (3.81 cm) Dome Radiator
1 - Coaxial Super Radiator
Cabinet is particleboard construction using
genuine walnut veneers. Front panel has a
matching walnut finish on selected hardwood solids. Decorative grilles have a simulated walnut finish on the front surface of
polystyrene moldings.
ML2M
2 - 10" (25.4 cm) Radiator - 12" (30.48 cm)
Loudspeakers
1 - 5" ( 1 2 . 7 c m ) R a d i a t o r - 8 " (20.32cm)
Loudspeaker
2 - 1-1/2" (3.81 cm) Dome Radiators
1 - Coaxial Super Radiator
ML2C
2 - 1 0 " (25.4cm) Radiator - 12" (30-48 cm)
- Loudspeakers
1 - 5" (12.7 cm) Radiator - 8" (20.32cm)
Loudspeaker
2 - 1-1/2" (3.81 cm) Dome Radiators
1 - Coaxial Super Radiator
Cabinet is particleboard construction using
genuine walnut veneers and selected hardwood solids. Front panels have a matching
walnut f i n i s h on selected hardwood solids.
Decorative grilles have a simulated walnut
finish on the front surface of polystyrene
moldings.
16
Cabinet is particleboard construction using
genuine pecan veneers and selected hardwood solids. Front panels have a matching
pecan finish on a rigid polyureathane molding.
IN YOUR LISTENING ROOM
FURNITURE TO MAKE THE WHOLE FAMILY PROUD
ML 4C
4 - 1 0 " (25.4cm) Radiator - 12" (30.48cm)
Loudspeakers
1 - 5" (12.7cm) Radiator - 8" (20.32cm)
Loudspeaker
4 - 1-1/2" (3.81 cm) Dome Radiators
2 - Coaxial Super Radiators
Cabinet is particleboard construction using
genuine walnut veneers and selected hardwood solids. Front panels have a matching
walnut finish on selected hardwood solids.
Decorative grilles have a simulated walnut
finish on the front surface of polystyrene
moldings.
MCINTOSH
ML 10C LOUDSPEAKER
The McIntosh ML 10C is a new addition to the
McIntosh Loudspeaker family. It is a speaker system
using the design techniques used in previous McIntosh
loudspeaker systems. The performance achievement
is without peer for a loudspeaker of this size and
price. Wide dispersion, exceedingly low intermodulation and harmonic distortion, uniform frequency response, and ample power handling capacity are features of the ML 10C
ML 10C
1 -8-3/8" (21.27 cm) Radiator - 10" (25.4 cm) Loudspeaker
1 - 1-1/2" (3.81 cm) Dome Radiator
1 - Coaxial Super Radiator
Cabinet is particleboard construction using genuine walnut
veneers. Front panel has a matching walnut finish on selected hardwood solids. Decorative grilles have a simulated
walnut finish on the front surface of polystyrene moldings.
17
With Your McIntosh Loudspeakers Use The....
McINTOSH ENVIRONMENTAL EQUALIZER
FOR THE SOUND OF REALITY IN YOUR
LISTENING ROOM
MQ 101 — Shown in walnut veneer cabinet
In McIntosh loudspeakers, the characteristics of the speaker
low frequency response. The most effective way of restoring
enclosure (cabinet) and of the loudspeaker have been cornflat low frequency response is the use of an electrically equalbined to produce near perfect transient response. The design
ized speaker input signal. McIntosh Environmental Equalizers
for excellent transient response must compromise the system's
do that job.
A switch selects from the five different high frequency
equalization curves. High frequency control permits the tailoring of the response of the entire system to compensate for
room characteristics such as large areas of glass and large areas
of plaster.
A switch selects from five different mid-frequency equalization curves. Mid-frequency control permits the tailoring of
the response of the entire system to compensate for room furnishings and room acoustics.
The MQ 101 McIntosh Environmental Equalizer is a three
band equalizer divided into low frequencies, mid-frequencies
and high-frequencies.
A concentric switch selects from five different low frequency equalization curves independently in each channel. In
addition to restoring flat response the low frequency equalization is used to compensate for the placement of loudspeakers in the listening room.
S I Z E ; Front panel: 16 inches wide (40.64 cm) by 2-15/16
inches high (7.46 cm). Chassis: 15 inches wide (38.1 cm) by 13
inches deep (33.02 cm) including PANLOC shelf and back
panel connectors; Knob Clearance: 1-1/2 inches (3.81 cm) in
front of mounting panel.
MQ102
18
The McIntosh MQ 102 is
a single band equalizer that compensates below 150 Hz. The
performance and operation are
identical to the MQ 101 low frequency compensation abilities.
SIZE: Chassis measures 63/4 inches wide (17.15 cm) by 2-1/2 inches high (6.35 cm)
by 4-1/8 inches deep (10.48 cm). Knob clearance required is
1-1/2 inches (3.81 cm).
Frequency in Hertz
Frequency in Herz
ELECTRICAL RESPONSE OF
ENVIRONMENTAL EQUALIZER
Frequency in Hertz
Conventionally designed loudspeakers should not
be used with a McIntosh Environmental Equalizer
since it will overdrive them. The result will be increased distortion and decreased life expectancy of the
speaker. Conversely, McIntosh loudspeakers should
not be used without the McIntosh equalizers. They
are designed to produce the low intermodulation
characteristics and proper frequency balance which is
so important to McIntosh sound-the SOUND of
REALITY.
Performance - flexibility - long
trouble free life - describe the
C-26 PREAMPLIFIER
Performance Limits
BASS:
Separate 11 position rotary switches for each channel.
20 dB to +16 dB at 20 Hz.
TREBLE;
Separate 11 position rotary switches for each channel.
-20 dB to +20 dB at 20,000 Hz.
LOUDNESS:
Flat response, or continuously variable loudness equalization as volume level is reduced.
TAPE MONITOR:
Two pushbutton switches. Either of two tape recorders can
be monitored by selecting the TAPE 1 pushbutton or TAPE
2 pushbutton. They are mechanically interlocked to accept
only one pushbutton at the IN position at one time.
LF F I L T E R (Rumble F i l t e r ) :
Flat or r o l l - o f f 6 dB per octave below 50 Hz, down
12 dB at 20 Hz.
HF F I L T E R (Scratch F i l t e r ) :
Flat or roll-off 6 dB per octave above 6,000 Hz, down
12 dB at 20,000 Hz.
SPEAKER:
Main - Switch the MAIN loudspeaker system ON or O F F
without affecting the performance of R E M O T E speakers.
Remote - Switch the R E M O T E loudspeaker system ON or
OFF without affecting the performance of MAIN speakers.
HEADPHONE JACK:
For listening with low impedance dynamic stereo headphones. Power to this jack is supplied when the output of
the amplifier is properly connected to the C 26.
CENTER CHANNEL L E V E L :
Top of chassis control to adjust the output level of the left
plus right program material at the C E N T E R C H A N N E L
output on the back panel.
PHASE CONTROL:
Electronically reverse phase in the left channel to correct
"out of phase" program sources.
FREQUENCY RESPONSE: +0, -0.5 dB 20 Hz to 20,000 Hz.
DISTORTION: Will not exceed 0.1% at any level up to 2.5
v o l t s output, 20 Hz to 20,000 Hz.
INPUT SENSITIVITY AND IMPEDANCE:
Auxiliary, Tuner, Tape 1, Tape 2, 0.25 volts at 250,000
ohms. Phono 1 and Phono 2, 2 millivolts at 47,000 ohms
(1,000 H z ) .
HUM AND NOISE;
Auxiliary, Tuner, Tape 1, and Tape 2, 85 dB below rated
output. Phono 1, Phono 2, 74 dB below 10 millivolts input,
equivalent to less than 2 microvolts at the input terminals.
OUTPUT L E V E L AND IMPEDANCE:
Main Output: 2,5 v o l t s with rated input, 200 ohms source
impedance, to operate into 47,000 ohms or more. Tape
Output: 0.25 v o l t s , 200 ohms source impedance, from low
level inputs to operate into 47,000 ohms or more.
Center Channel Output: (L + R) 2.5 v o l t s with rated input
to both channels, 1,200 ohms source impedance, to operate
into 47,000 ohms or more. A level control a d j u s t s the center
channel output from +6 dB with respect to Main output.
AMPLIFICATION IN D E C I B E L S :
A u x i l i a r y , Tuner, Tape 1 and Tape 2 to Main Output 20 dB;
to Tape Output 0 dB; Phono 1 and Phono 2 (at 1,000 Hz);
to Main Output 62 dB; to Tape Output 42 dB.
SEMICONDUCTOR:
18 silicon planar transistors, and 3 silicon diodes.
POWER R E Q U I R E M E N T :
120 volts, 50/60 Hz, 15 watts.
MECHANICAL
S I Z E : Front panel: 16 inches wide (40.64 cm) by 5 - 7 / 1 6 inches
high (13.81 cm). Chassis: 15 inches wide (38,1 cm) by 5
inches high (12.7 cm) by 13 inches deep (33.02 cm) including
PANLOC mounting brackets and back panel connectors.
Knob clearance required as 1-1/2 inches (3.81 cm) in front
of the mounting panel.
FINISH: Front panel is anodized gold and black with special
McIntosh gold/teal panel nomenclature illumination.
CHASSIS: black.
MOUNTING: McIntosh developed professional PANLOC.
WEIGHT: 18 pounds (8.16 kg) net, 33 pounds (14.97 kg)
in shipping carton.
19
THE McINTOSH C28 STEREO PREAMPLIF
EASIEST TO USE- - MOST ADVANCED
Shown in walnut veneer cabinet
McIntosh engineers could not be content with just another
preamplifier. New concepts and new technology have produced
a preamplifier that gives you the greatest flexibility ever. Look
at the great number of ways you can enjoy the C 28
• Use 3 tape machines
2 with their own electronics and 1 tape playback deck
with complete easy front panel switching
Built-in Headphone Amplifier
listen to your favorite music - - - privately
• Main and Remote Loudspeaker Switching
turn the main speakers on or off without affecting the
remote speakers and vice versa (operates with accessory
relay).
NEW LOW NOISE PHONO CIRCUITS
New records and tapes with greatly increased dynamic range
demanded new low noise circuits. McIntosh scientists developed a new D I F F E R E N T I A L INPUT CIRCUIT that reduced
phono input noise levels from approximately 2.4 microvolts in
an excellent preamplifier to a new level of only 1.2 microvolts!
The differential input circuit has only been used in very sensitive professional test equipment and in medico-electronics.
The preamplifier will not overload or change distortion for
any phono input signal from 2 millivolts up to 500 millivolts.
This represents a dynamic range of approximately 3000 to 1 on
a voltage basis. This fantastic improvement necessitated extreme care in layout and manufacturing. The signal circuits
need careful shielding and wiring with coaxial cable to prevent
noise and crosstalk in the preamplifier from destroying the
low noise of the input circuit.
NEW TAPE F L E X I B I L I T Y
•
New Low Noise Phono Input
listen to your records with a new quietness
•
Individual Channel Phono Level Controls
match levels from different phono cartridges without
degrading signal to noise ratio
•
Individual Channel Output Level Controls
perfect balance from your stereo always
•
Individual Channel Tone Control Switches
complete, repeatable flexibility
•
20
NEW Compensation Control
one position for loudness compensation, one position
is flat and (NEW) a third position that adds presence
compensation!
With the C 28 you can copy from one tape recorder to
another while listening to a completely different program!
In addition, you can monitor the recording by simply pushing a button and an input circuit has been provided to accept
the signal from a tape playback deck.
You can use three tape machines with the C 28. There are
front panel jacks that permit the use of the third tape recorder.
When plugged into the front panel j a c k s the tape recorder
connected to Tape Recorder 2 is automatically disconnected
and the controls provided are used with the third tape recorder.
NEW HEADPHONE AMPLIFIER
Use your headphones for private listening. Ample power
has been provided to power todays high quality low impedance
dynamic headphones, plus a separate power switch in the
preamplifier turns the power amplifiers on or off. It is not
necessary to operate the power amplifiers while listening to
headphones.
lER IS THE QUIETEST--MOST FLEXIBLE-AND HAS THE LOWEST DISTORTION!
Performance Limits
FREQUENCY RESPONSE:
+0-0.5 dB 20 Hz to 20,000 Hz
DISTORTION:
Will not exceed 0.1% at rated output level, 20 Hz to
20,000 Hz.
INPUT SENSITIVITY AND IMPEDANCE:
Auxiliary, Tuner, Tape 1, Tape 2, 0.25 volts; 250,000 ohms.
Phono 1 and Phono 2, 2 millivolts; 47,000 ohms (1,000 Hz).
Microphone, 2.5 millivolts; 500,000 ohms.
Tape Head, 2 millivolts; 500,000 ohms (500 Hz).
HUM AND NOISE:
Auxiliary, Tuner, Tape 1, Tape 2: 90 dB below rated
output. Phono 1, Phono 2 and Tape Head: 78 dB below
10 millivolts input, equivalent to less than 1.2 microvolts at
the input terminals. Microphone: equivalent to less than
1.5 microvolts at the input terminals.
OUTPUT LEVEL AND IMPEDANCE:
Main Output: 2.5 volts with rated input, 100 ohms source
impedance, to operate into 47,000 ohms or more. Tape
Output: 0.25 volts, 150 ohms source impedance, from
low level inputs, to operate into 47,000 ohms or more.
Headphone/Line Output: 0.75 volts into 8 ohm load or
2.5 volts into 600 ohm line, 0.2 ohm source impedance,
Center Channel Output: 1.25 volts with rated input to both
channels, to operate into 47,000 ohms or greater.
AMPLIFICATION IN DECIBELS:
Auxiliary, Tuner, Tape 1 and 2 to Main Output: 20 dB;
to Tape Output: 0 dB; to Headphone/Line Output: 17.5 dB.
Phono 1 and Phono 2 at 1,000 Hz to Main Output: 62 dB;
to Tape Output: 42 dB; to Headphone/Line Output: 59.5 dB.
Microphone: to Main Output: 60dB; to Tape Output: 40 dB;
to Headphone/Line Output: 57.5 dB. Tape Head at 500 Hz:
to Main Output: 64 dB; to Tape Output: 44 dB: to
Headphone/Line Output: 61.5 dB.
POWER REQUIREMENT:
120 volts, 50/60 Hz, 45 watts.
FACILITIES AND FEATURES
BASS CONTROLS:
11 position r o t a r y switch in each channel, ± 20 dB
at 20 Hz.
T R E B L E CONTROLS:
11 position rotary switch in each channel, ± 18 dB
at 20,000 Hz.
COMPENSATION SWITCH:
Three position switch for Flat, Loudness, or Presence.
Loudness position boosts low frequencies for low level
listening. Presence position boosts mid frequencies 4 dB to
increase "presence" effect.
VOLUME CONTROL:
AC power ON/OFF switch is coupled with this control.
MODE SELECTOR:
Seven positions: Left channel only to both speakers, Right
channel only to both speakers. Stereo Reverse, Stereo,
Mono, L + R to left speaker only, and L + R to right
speaker only.
TAPE MONITOR SWITCHES:
Either of two tape recorders can be monitored by use of
either the TAPE 1 or TAPE 2 pushbutton.
TAPE COPY SWITCH:
Provides switching to copy from tape machine 1 to tape machine 2 or vice versa without affecting the program being
heard.
LF FILTER SWITCH (Rumble Filter):
Flat or roll-off at 12 dB per octave below 50 Hz, down
18 dB at 20 Hz.
HF FILTER SWITCH (Scratch Filter):
Flat or roll-off at 12 dB per octave above 7,000 Hz, down
18 dB at 20,000 Hz.
SPEAKER SWITCHES (Operates with accessory relay):
Turn the main speakers on or off without affecting the
remote speakers and vice versa.
HEADPHONE JACK:
Power to this jack is supplied by an amplifier provided in
the C 28.
LOW FREQUENCY TRIM CONTROLS:
Use to compensate for unequal speaker response or the
unequal influence of room acoustics.
PHONO 1 AND PHONO 2 LEVEL CONTROLS:
Provides for optimum signal to noise ratio and proper
balance of the channels of the phono cartridge.
OUTPUT LEVEL CONTROLS:
Permits presetting the balance of the entire system.
HEADPHONE LEVEL CONTROLS:
Adjusts the output of the headphone/line amplifier output.
TRANSISTOR COMPLEMENT:
26 silicon-planar transistors, 4 silicon diodes, 2 silicon
bridge rectifiers.
MECHANICAL
SIZE:
Front panel measures 16 inches wide (40.64 cm) by
5-7/16 inches high (13.81 cm). Chassis measures 15 inches
wide (38.1 cm] by 5 inches high (12.7 cm) by 13 inches
deep (33.02 cm) including PANLOC mounting brackets and
back panel connectors. Knob clearance required is 1-1/2
inches (3.81 cm) in front of the mounting panel.
FINISH:
Front panel is anodized gold and black with special gold/
teal nomenclature illumination. Chassis is black.
MOUNTING:
Exclusive Mclntosh developed professional PANLOC.
WEIGHT:
25 pounds (11.34 kg) net, 37 pounds (16.78 kg) in shipping
carton.
Speaker Control Relay
I
SCR 2
The Mclntosh Speaker Control
Relay is designed for use with the
Mclntosh C 28 Stereo Preamplifier.
The SCR 2 provides for remote control of both the AC power to a remote amplifier and the on/off control of the Main and Remote loudspeakers. Control for the SCR 2 is
provided by pushbuttons and a low
voltage supply in the C 28.
SIZE:
.Chassis measures 6-3/4
inches wide (17.15 cm) by 2-1/2
inches high (6.35cm) by 4-1/8 inches
deep (10.48cm). Terminal clearance
required is 1-1/2 inches (3.81 cm)
21
THE MCINTOSH MPI4 MAXIMU
The MPI 4 helps you get
• max/mum performance
from your stereo system
• a v/ew of the separation provided on any signal source
• absolute balance of your stereo channels from phono cart
PHONOCARTRIDGE CALIBRATION
You will protect your record investment, extend the life of your records, and
reduce needle wear when the turntable is
properly set up. With the aid of test recordings the MPI 4 will assist in this proper
set up. The display assists in properly adjusting for proper tracking force, best
tracing vs tracking force, anti-skate, proper
phasing, and channel separation.
PHASE
Program material that is "out of phase"
sounds unnatural and thin; "in phase"
sounds alive and rich. Occasionally a program source will be "out of phase." On
the MPI 4 you can see the phase relationship so you can correct the condition.
22
DUAL TRACE
FM TUNING
Each channel of stereo signal is displayed individually in the dual trace mode of
operation. Comparison of the signals assists
in comparison of recordings, the quality
of stereo information in the source and
much other valuable information.
You'll see signal strength, center channel FM tuning and a reference for multipath distortion elimination. The image is
a display of the tuner IF curve. Signal
strength is the vertical axis. Horizontal
center is the center of the detector and IF
curves. Proper tuning gives minimum distortion and maximum listening pleasure on
all kinds of FM broadcasts.
M PERFORMANCE INDICATOR
• better FM reception
• "once in a lifetime" programs flawlessly recorded
• a measurement of the performance of the phono cartridge
ridge to speakers
• accurate measurement of power output
LEVEL
The audio level of stereo signals is displayed as two vertical columns on the
screen. The height of each column is determined by the power or amplitude of the
input signal.
Action can be stopped and held to permit close comparison between the highest
levels attained by left and right channels.
Shown in walnut veneer cabinet
MULTIPATH DISPLAY
CHANNEL SEPARATION
BALANCE
Multipath reception deprives you of
FM listening enjoyment in several ways:
The MPI 4 shows the stereo separation
from all stereo program material. The display changes position and shape with the
program material to permit interpretation
of what the display means to your listening enjoyment. You see what makes a good
stereo record sound good. You will know
why your records sound the way they do.
Accurate system balance assures you
of full stereo pleasure. The MPI 4 gives
you a visual indication of the balance of
your stereo system. You can check and
correct the output balance of your stereo
phono cartridge, tape recorder, tuner, or
any part of your stereo system. You will
know when your stereo system is in balance when you use an MPI 4.
•
•
noise level increase
distortion is introduced into the
program material
• stereo separation is reduced
• the stereo effect may be completely
lost
•
stereo indicators may f a i l to function
23
THOROUGH, UNINHIBITED RESEARCH HAS
DEVELOPED THE NEW TECHNOLOGY
NECESSARY FOR A TRULY LOW DISTORTION
FM TUNER WITH VARIABLE SELECTIVITY.....
THE McINTOSH MR 78!
McIntosh research is a continuous program of exploration for
new technology that permits performance improvement and
greater value for you. This unrestricted research program
developed the new technology necessary for the realization of
these new design concepts for the MR 78.
THE DISTORTIONLESS IF FILTER
Ever since the beginning of FM, research engineers have
realized that constant delay IF filters (equivalent to linearphase) were necessary for low distortion reception. Crude
approximations to constant delay have always been used in
FM tuners - with disappointing results. So-called "Butterworth"
or "Legandre" filters offer only a fair compromise with respect
to delay error. Crystal and ceramic filters, usually based on
the "Chebychev" model, work fairly well and give good
selectivity, but none of these are constant delay (linear-phase)
filters. Commercial tuners using these filters can show 5%
stereo IM distortion at 100% modulation. The filters used in
todays tuners can have delay errors up to 100%! The IF filter
in the MR 78 has a delay error of less than 1% from antenna
input to discriminator output! In its useful bandpass, it is a
true mathematical approximation to linear-phase - the world's
finest selective, linear-phase, minimum-phase shift filter.
A FORTRAN computer program using an algorithm that
took six years to develop was used in its design. The mathematical complexity of the filter design procedure is almost beyond
belief. Using a process called "numerical integration in the
complex S-plane," a high speed IBM 1130 computer spent
eighteen minutes on the design of the IF filter. A human
engineer, working twenty-four hours a day and seven days a
week, would have taken 300 years to finish this work . . .
assuming he made no mistakes!
LINEAR PHASE BRIDGE DISCRIMINATOR
The excellence of the IF filter would be useless if it had to
work into an ordinary FM detector. Thus a new detector with
suitably low distortion had to be developed. A search of the
available literature revealed a little-known bridge circuit with a
theoretical distortion of zero! However, designing a practical
working circuit for a commercially feasible stereo tuner took
some doing. A U. S. patent is pending on this circuit.
24
Distortion performance of the bridge detector is pretty
close to the theoretical zero. In addition to its excellent distortion performance, the bridge detector also exhibits capture
ratio close to 0 dB.
Tuned circuits are not used in the MR 78 detector. They are
quite difficult to manufacture and align accurately, and
ordinary tuned-circuit discriminators go out of adjustment.
There has been much talk about "permanently aligned" IF
filters, but much silence concerning the most important source
of misalignment in these same tuners - the discriminator. The
two simple variable resistor adjustments in the MR 78 detector
merely center the tuning meter and set the transistor bias.
Complex tuning for minimum distortion is not needed.
NEW VARIABLE SELECTIVITY
The MR 78 has excellent selectivity. The bandwidth (210
kHz wide at 60 dB down) permits tuning stations that are
impossible on ordinary tuners. Even though the MR 78 has the
narrowest IF bandwidth ever used in a stereo tuner, (it is the
correct width to let just one FM station through) the great
number of stations crowding the FM band requires a tuner with
variable selectivity.
Variable selectivity allows stereo reception even under
severe receiving conditions. In the NORMAL position, a very
low distortion 8-pole filter is used in the IF circuit for listening
to local broadcasts.
The NARROW position adds a sharp 8-pole filter to the
NORMAL IF filter to yield a low distortion (less than 0.2%),
highly selective 16-pole composite IF filter. In the NARROW
position interference is reduced while receiving distant stations.
SUPER-NARROW position adds a 4-pole 4-zero crystal
filter to the two other IF filters. SUPER NARROW permits
receiving distant stations which are on channels adjacent to
local stations. With an adequate FM antenna there are usable
signals never heard before with ordinary FM tuners.
Beautiful styling, extended control flexibility and meaningful illuminated operational indicators bring the McIntosh
MR 78 to a new high level of professionalism.
PERFORMANCE GUARANTEE:
Performance limits are the maximum deviation from perfection permitted for a McIntosh instrument. We promise
you that the MR 78 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.
Performance Limits
TUNING RANGE:
88 to 108 MHz.
ANTENNA INPUTS:
300 ohms balanced; 75 ohms unbalanced.
INTERMEDIATE FREQUENCY:
10.7 MHz.
SENSITIVITY:
2 mV for 35 dB quieting; 2.5 mV at 100% modulation (± 75
kHz deviation) for 3% total noise and harmonic distortion.
SIGNAL TO NOISE RATIO:
75 dB below 100% modulation.
HARMONIC DISTORTION:
0.2% mono or stereo at 100% modulation, 20 Hz to 15,000
Hz. Typically, 0.05% at 1,000 Hz.
DRIFT:
25,000 Hz for the first two minutes; thereafter 5,000 Hz
at 25° C in 24 hours.
FREQUENCY RESPONSE:
Mono: ± 1 dB 20 Hz to 20,000 Hz with standard deemphasis, (75 mS); Stereo: ± 1 dB 20 Hz to 15,000 Hz with
standard de-emphasis (75 mS).
CAPTURE RATIO:
0.25 dB detector only; 2.5 dB complete tuner.
SELECTIVITY: Switch Setting:
NORMAL
NARROW
SUPER NARROW
Adjacent Channel
7 dB
22 dB
55 dB
Alternate Channel
55 dB
> 90 dB
>>
90 dB
SPURIOUS REJECTION:
100dB IHF.
IMAGE REJECTION:
100 dB at 88 to 108 MHz ( I H F ) .
INTERMODULATION DISTORTION:
0.2% mono or stereo for any combination of frequencies
from 20 Hz to 15,000 Hz with peak modulation equal to
100% or less. Typically 0.1%.
MAXIMUM SIGNAL INPUT:
12 volts across 300 ohm antenna terminals will not increase
harmonic or intermoduiation distortion.
AUDIO HUM:
75 dB down from 100% modulation.
MUTING:
70 dB noise reduction between stations.
MUTING THRESHOLD (Typical):
DISTANT position 5 mV; LOCAL position 20 mV
SCA FILTER:
50 dB down from 67 kHz to 74 kHz; 275 dB per octave
slope.
STEREO SEPARATION:
40 dB at 1,000 Hz.
STEREO FILTER (Typical):
10 dB noise reduction in Position 1.
20 dB noise reduction in Position 2.
AUDIO OUTPUT:
Front Panel Controlled: 2.5 volts into 47,000 ohms; Fixed
Output: 2.5 volts into 47,000 ohms, 1.0 volts into 600 ohms.
All tuner performance limits were measured with SELECTIVITY switch set at NORMAL, unless otherwise stated.
GENERAL
POWER REQUIREMENT:
120 volts, 50/60 Hz 35 watts.
SEMICONDUCTOR COMPLEMENT:
3 JFET's, 2 MOSFET's, 17 Bipolar Transistors, 43 Diodes,
4 Integrated Circuits.
MECHANICAL
SIZE:
Front panel: 16 inches wide (40.64 cm) by 5-7/16 inches
high (13.81 cm); Chassis: 15 inches wide (38.1 cm) by 13
inches deep (33.02 cm), including PANLOC shelf and back
panel connectors; Knob Clearance: 1-1/2 inches (3.81 cm)
in front of mounting panel.
FINISH:
Front panel: Anodized gold and black with special gold/teal
panel nomenclature illumination; Chassis: Chrome and black.
MOUNTING:
McIntosh developed professional PANLOC.
WEIGHT:
27 pounds (12.25 kg)
shipping carton.
net, 39 pounds (17.69 kg) in
25
LOW DISTORTION AND HIGH
PERFORMANCE FOR SUPERIOR FM
THE MR 77
Performance Limits
USABLE SENSITIVITY:
2 mV for 35 dB of quieting, 2.5 microvolts typical.
SIGNAL TO NOISE RATIO;
75 dB below 100% modulation
HARMONIC DISTORTION:
Will not exceed 0.2% mono or stereo at 100% modulation,
20 Hz to 15,000 Hz.
INTERMODULATION DISTORTION:
Will not exceed 0.2% mono or stereo for any combination
of frequencies from 20 Hz to 15,000 Hz with peak modulation equal to 100% or less, 0.1% typical.
AUDIO FREQUENCY RESPONSE:
± 1 dB 20 Hz to 15,000 Hz with standard de-emphasis,
(75 m5) and 19,000 Hz pilot filter.
CAPTURE RATIO:
0.25 dB detector only; 2.5 dB complete tuner at 100%
modulation.
SPURIOUS REJECTION:
100 dB.
IMAGE REJECTION:
100 dB at 88 to 108 MHz ( 1 H F ) .
SELECTIVITY:
Adjacent channel: 6 dB; Alternate channel: 50 dB.
STEREO SEPARATION:
40 dB at 1,000 Hz.
STEREO F I L T E R :
10 dB noise reduction in position 1; 20 dB noise reduction
in position 2.
SCA F I L T E R :
50 dB down from 67 kHz to 74 kHz; 275 dB per octave
slope.
DRIFT:
25,000 Hz in first two minutes; thereafter 5,000 Hz in
normal temperatures.
MUTING:
70 dB noise reduction between stations.
MUTING THRESHOLD:
Position 1, 5 mV. Position 2, 20 mV.
ANTENNA INPUTS:
300 ohms balanced; 75 ohms unbalanced.
26
MAXIMUM SIGNAL INPUT:
12 volts across 300 ohms antenna terminals will not increase harmonic or intermodulation distortion.
AUDIO OUTPUT;
2.5 volts into 47,000 ohms; 1 volt into 600 ohms from
fixed output.
IF SYSTEM:
8-Pole IF filter,
2 IC's
1 J-FET, and push-pull overlay power transistor stage
driving a linear phase bridge discriminator.
STEREO INDICATOR:
Stereo light activated by 19,000 Hz only.
AUTOMATIC MONO-STEREO SWITCH:
McIntosh developed; all electronic automatic mono-stereo
switching circuit.
GENERAL
SEMICONDUCTOR COMPLEMENT:
21 Transistors
4 Integrated Circuits
1 Indicator Tube.
POWER REQUIREMENT:
120 volts, 50/60 Hz, 35 watts.
MECHANICAL
SIZE
Front panel: 16 inches wide (40.64 cm) by 5-7/16 inches
high (13.81 cm); Chassis: 15 inches wide (38.1 cm) by 13
inches deep (33.02 cm) including PANLOC shelf and back
panel connectors. Knob Clearance: 1-1/2 inches (3.81 cm)
in front of mounting panel.
FINISH:
Front panel: Anodized gold and black with special gold/
teal nomenclature illumination. Chassis: Chrome and black.
MOUNTING:
McIntosh developed professional PANLOC.
WEIGHT:
27 pounds (12.25 kg) net,
39 pounds (17.69 kg) in shipping carton.
NEW ENGINEERING NEW PERFORMANCE
THE MR 74 AM-FM/FM STEREO TUNER
Shown in walnut veneer cabinet
A new addition to the front panel is the SELECT pushbutton.
With it, control of the IF characteristics is brought to the front
panel. It allows stereo reception even under severe receiving conditions. In the NORMAL position a very low distortion dual QUADTUNED IF filter is used. The dual QUAD-TUNED IF filter has
unusual adjacent channel selectivity and low distortion. The QUADTUNED IF filter has equal time delay in its pass band region. All
other IF filters have excessive delay distortion. The QUAD-TUNED
IF filter has almost no delay distortion from antenna input to discriminator output! You get overall lower distortion performance.
Activating the SELECTivity pushbutton routes the signal to two
double-tuned transformers, a ceramic filter network, and a singlegate MOS-FET. The sides of the IF curve are compressed by this circuit narrowing the IF bandpass. In this mode of operation weak stations adjacent to strong stations can be tuned with surprising clarity.
McIntosh has developed a special detecting circuit used in the
multiplex section. A particular advantage of this circuit is the elimination of the critical adjustments necessary with commonly used
matrixing circuits. The circuit detects the L - R sidebands, then
Performance
FM
SENSITIVITY: 2.5 mV at 100% modulation (±75 kHz deviation) for 3% total noise and harmonic distortion
SIGNAL TO NOISE RATIO: 70 dB below 100% modulation
HARMONIC DISTORTION: MONO - 0.3% at 100% modulation ±75 kHz deviation; STEREO -0.5% at 100% modulation
DRIFT: 25,000 Hz for the first two minutes; thereafter 5,000
Hz at ambient temperatures
FREQUENCY RESPONSE: ±1 dB 20 Hz to 15,000 Hz with
standard de-emphasis (75 mS) and 19,000 Hz pilot filter
CAPTURE RATIO: 1.5 dB minimum
SELECTIVITY: Switch Setting:
NORMAL
NARROW
Adjacent Channel:
6 dB
15 dB
Alternate Channel:
58 dB
88 dB
SPURIOUS REJECTION: 90 dB
IMAGE REJECTION: 95 dB at 88 to 108 MHz (IHF)
MUTING: 50dB noise reduction in LOCAL position
SCA FILTER: 50 dB down from 67 kHz to 74 kHz; 275 dB
per octave slope
STEREO SEPARATION: 35 dB at 1,000 Hz
STEREO FILTER: 10 dB noise reduction in Position 1;20 dB
noise reduction in Position 2
AM
SENSITIVITY: 75 mV (external ant.)
SIGNAL TO NOISE RATIO: 55 dB at 100% modulation; 45
dB minimum
automatically matrixes the recovered information with the L + R
carrier signal. This yields the left and right program output with
maximum separation.
AM
For greater spurious rejection the AM-RF amplifier circuit includes a three section variable tuning capacitor in the metal enclosed shielded RF module which also houses the FM-RF front end.
The AM circuit has constant sensitivity, constant selectivity, high
image rejection across the complete AM band. This circuit design
achieves equal sensitivity even down at the low end of the band.
Spurious, image, and intermediate frequency rejection are all
superior. The McIntosh circuit is unique in a superheterodyne
AM receiver.
A high-quality loopstick antenna is provided. It can be rotated
for maximum performance, optimum signal rejection or minimum
interference. Each loopstick is individually tuned for optimum performance. After tuning the loopstick is then sealed. Custom matching of the loopstick to the AM-RF front end maximizes the performance of the loopstick antenna.
Limits
HARMONIC DISTORTION: Does not exceed 1% at
30% modulation
SELECTIVITY: Switch Setting:
NORMAL
NARROW
Adjacent Channel:
35 dB
45 dB
IMAGE REJECTION: 65 dB minimum 540 kHz - 1600 kHz
FREQUENCY RESPONSE: 3500 Hz - 6 dB down, NORMAL
position; 2100 Hz - 6 dB down, NARROW position.
All tuner performance limits were measured with SELECTIVITY at NORMAL, unless otherwise stated.
GENERAL
POWER REQUIREMENTS: 120 volts, 50/60 Hz, 30 watts
SEMICONDUCTOR COMPLEMENT: 5 FETs, 17 transistors,
2 ICs, 28 diodes, 1 indicator tube
MECHANICAL
SIZE: Front panel: 16 inches wide (40.64 cm) by 5-7/16 inches
high (13.81 cm); Chassis: 15 inches wide (38.1 cm) by 13
inches deep (33.02 cm), including PANLOC shelf and back
panel connectors; Knob Clearance: 1-1/2 inches (3.81 cm)
in front of mounting panel.
FINISH: Front panel: Anodized gold and black with special
gold/teal panel nomenclature illumination; Chassis: Chrome
and black.
MOUNTING: McIntosh developed professional PANLOC.
WEIGHT: 25 pounds (11.34 kg) net; 37 pounds (16.78 kg) in
shipping carton.
27
HIGH PERFORMANCE, SOLID STATE
ALL IN A COMPACT, BEAUTIFUL
MX 113 AM-FM/FM STEREO
OUTSTANDING NEW DESIGN AND
PERFORMANCE
The IF in the FM consists of two integrated circuits and two QUAD-TUNED filters. They combine to give a total gain
of over 120 dB (the signal is amplified
to over 1,000,000 times its original level.)
The IF filter has equal time delay in
its pass band region. Any error in time delay
causes FM distortion. All other IF filters
have delay distortion, some as much as 100%
of the 10.7 MHz transit delay. This circuit
has less than 1.0% delay distortion from
antenna input to discriminator output which
makes possible the overall low distortion
performance limit for the FM tuner and
multiplex section.
The response curve of the IF has nearly
linear phase characteristic. The skirts of the
response curve are very steep. The maximum
width is 170 kHz at - 3.0 dB and 500 kHz at
— 60 dB. The response curve is symmetrical
each side of the center frequency. The filters
are permanently sealed and do not require adjusting. The IF cannot drift nor vibrate out
of adjustment. The exceptionally high gain
of the two integrated circuits assures "hard
limiting" at very low levels of input signals.
Each integrated circuit contains 16 transistors, 3 zener diodes, 5 diodes and 23 resistors, all on a single monolithic silicon chip.
VARIABLE SELECTIVITY
A new addition to the front panel is the
SELECT pushbutton. With it, control of the
IF characteristics is brought to the front
panel. It allows stereo reception even under
severe receiving conditions. In the NORMAL
position a very low distortion dual QUADTUNED IF filter is used. It exhibits unusual
excellent adjacent channel selectivity and
low distortion. The QUAD-TUNED IF filter
has equal time delay in its pass band region.
All other IF filters have excessive distortion.
The QUAD-TUNED IF filter has almost no
delay distortion from antenna input to discriminator output! You get overall lower
distortion performance.
Activating the SELECTivity pushbutton
routes the signal to two double-tuned transformers, a ceramic filter network, a singlegate MOS-FET, and the dual QUAD-TUNED
IF filters. The sides of the IF curve are compressed, narrowing the IF bandpass. In this
mode weak stations adjacent to strong stations can be tuned with surprising clarity.
McIntosh has developed a special detecting
circuit used in the multiplex section. A
particular advantage of This circuit is the
elimination of the critical adjustments necessary with commonly used matrixing circuits. The circuit detects the L — R sidebands,
then automatically matrixes the recovered
information with the L + R carrier signal.
This yields the left and right program output
with maximum separation.
MX 113 AM-FM/FM STEREO TUNER PREAMPLIFIER
Shown in walnut veneer cabinet
AM-FM/FM STEREO
For greater spurious rejection the AM-RF amplifier circuit
includes a three section variable tuning capacitor in the metal
enclosed shielded RF module which also houses the FM-RF
front end. The AM circuit has constant sensitivity, constant
selectivity, high image rejection across the complete AM
band. This circuit design achieves equal sensitivity even down
at the low end of the band. Spurious, image, and intermediate
28
frequency rejection are all superior. The McIntosh circuit is
unique in a superheterodyne AM receiver.
A high-qualtiy loopstick antenna is provided. It can be
rotated for maximum performance, optimum signal reception
or minimum interference. Each loopstick is individually Tuned
for optimum performance. After tuning The loopstick is then
sealed. Custom matching of the loopstick to the AM-RF front
end maximizes the performance of the loopstick antenna.
RELIABILITY AND IDEAL FLEXIBILITY...
STEREO CONTROL CENTER
TUNER
PREAMPLIFIER
Performance Limits
FM
USABLE SENSITIVITY: 2.5 microvolts at 100% modulation
(± 75 kHz deviation) for less than 3% total noise and harmonic distortion,
SIGNAL TO NOISE RATIO: 70 dB at 100% modulation,
HARMONIC DISTORTION: Mono: Will not exceed 0.3% at
100% modulation ± 75 kHz deviation. Stereo: Will not
exceed 0.5% at 100% modulation ± 75 kHz deviation.
FREQUENCY RESPONSE: ± 1 dB from 20 Hz to 15,000 Hz
with standard de-emphasis (75mS) and 19,000 Hz pilot filter.
CAPTURE RATIO: 1.5 dB
SPURIOUS REJECTION: 90dB
IMAGE REJECTION: 95 dB at 88 to 108 MHz (IHF)
STEREO SEPARATION: Exceeds 35 dB at 1,000 Hz.
SELECTIVITY: Switch Setting:
OUT
IN
Adjacent Channel:
6dB
15dB
Alternate Channel:
58 dB
88 dB
TUNING INDICATOR: D'Arsonval movement meter with
increased sensitivity.
STEREO INDICATOR: Stereo light activated by 19,000 Hz
pilot signal only.
AM
SENSITIVITY: 75 microvolts at 1,000 kHz (using external
antenna input).
SIGNAL TO NOISE RATIO: 45 dB
HARMONIC DISTORTION: 1% at 30% modulation.
FREQUENCY RESPONSE: Down 6dB at 3,500 Hz.
SELECTIVITY: Switch Setting:
OUT
IN
Adjacent Channel:
35 dB
45 dB
IMAGE REJECTION: 65 dB; 540 kHz to 1600 kHz
PREAMPLIFIER
FREQUENCY RESPONSE: ± 0.5 dB, 20 to 20,000 Hz.
DISTORTION: Will not exceed 0.1% at 2.5 volts output,
20 to 20,000 Hz.
INPUT SENSITIVITY AND IMPEDANCE:
Phono 1 and Phono 2: 2 millivolts for 2.5 volts output at
1,000 Hz, 47,000 ohms; Auxiliary and Tape: 0.25 volts
for 2.5 volts output; 250,000 ohms.
VOLTAGE AMPLIFICATION:
Phono 1, Phono 2 to Main output 62 dB, to Tape output
42 dB. Auxiliary, Tape to Main output 20 dB to Tape
output 0 dB.
OUTPUT:
Main: 2.5 volts with rated input. Up to 10 volts can be
developed without increase in distortion. FM will produce
10 volts output at 100% modulation. Tape: 0.25 volts with
rated input. Phono signal to 10 millivolts produces 1.2 volts
output. FM will produce 1 volt output at 100% modulation.
L + R 2 volts with rated input.
HUM AND NOISE:
Phono 1 and Phono 2: 72 dB below 10 millivolt input;
equivalent to less than 3 microvolts at the input terminals.
Aux-Tape: 85 dB below 2.5 volts output, unweighted.
BASE CONTROL: -18 dB to + 16 dB at 20 Hz.
TREBLE CONTROL: ± 20 dB at 20,000 Hz.
LF FILTER: Flat or roll off below 50 Hz, down 12 dB at
20 Hz.
HF FILTER: Flat or roll off above 5,000 Hz, down 12 dB at
20,000 Hz.
POWER REQUIREMENTS: 120 volts, 50/60 Hz, 30 watts
TRANSISTOR COMPLEMENT:
2-JFET
3-MOSFET
30—Silicon Planar
31-Diodes
2—Integrated Circuits (each contains the equivalent of 16
transistors and 8 diodes).
FACILITIES AND FEATURES
VOLUME CONTROL: Precision "tracked" at all listening
levels. (0 to —65 dB). Does not change stereo balance as
loudness is changed. The AC power ON/OFF switch is
coupled with this control.
BALANCE CONTROL: Natural balance at center position,
attenuation of left or right channel by rotating control.
LOUDNESS: Loudness compensated or flat response—Loudness position boosts low frequencies for low level listening.
Operates as a function of volume control position. Full
compensation is obtained at lower volume levels and flat
response is obtained at full volume.
SELECTIVITY: Increases the ability of the tuner to separate
a weak (distant) station from a strong (local) station on
adjacent channels.
MODE: Selects either stereo or mono operation.
PHASE CONTROL: Electronically reverses phase in the left
channel to correct "out of phase" program sources.
MUTING: Suppresses the background noise and hiss normally
heard between FM stations.
TAPE MONITOR: Pushbutton; compares recorded tape with
program source while recording.
MUTING ADJUST: Modifies the noise rejection threshold on
FM.
DIAL SCALE INTENSITY; Modifies the brightness of the
illumination of the front panel.
MECHANICAL
SIZE: Front panel: 16 inches wide (40.64 cm) by 5-7/16 inches
high (13.81 cm); Chassis: 15 inches wide (38.1 cm) by 13
inches deep (33.02 cm), including PANLOC shelf and back
panel connectors, Knob Clearance: 1-1/2 inches (3.81 cm)
in front of mounting panel.
FINISH: Front panel: Anodized gold and black with special
gold/teal panel nomenclature illumination; Chassis: Chrome
and black.
MOUNTING: McIntosh developed professional PANLOC.
WEIGHT: 26 pounds (11.79 kg) net, 38 pounds (17.24 kg) in
shipping carton.
29
Shown in walnut veneer cabinet
MA 6100
....Here
is performance once associated
only with separate preamps and power amps
The MA 6 1 0 0 d e l i v e r s M c I n t o s h performance and quality in a combination solid state preamplifier and solid state power amplifier. The
stereo preamplifier has the lowest hum and noise of any c o m b i n a t i o n
unit.
The MA 6 1 0 0 reproduces music accurately. There is no fuzziness.
Here is the power you need to give you the sound of f i v e music in your
home.
The Silicon r e c t i f i e r s power supply h a s instant response to the amplifiers needs. Recovery f r o m the loudest musical passage is instantaneous. The music sounds alive and thrilling, not clouded by power supply
under design.
McIntosh audio power ratings are in accordance with
the Federal Trade Commission Regulation of November 4, 1974 concerning power output claims for amplifiers used in home entertainment products.
Aux, Tape, Tuner: 90 dB below rated output
Phono Input, Tape Hd.: 76 dB below 10 mV input
OUTPUT V O L T A G E :
At TAPE output:
Aux, Tape, Tuner: 3 0 0 mV with rated input
Phono: 3 0 0 mV with rated input; 1.2 v o l t s with 1.0 mV input
at 1 0 0 0 Hz
Tape Hd: 3 0 0 mV at 5 0 0 Hz with rated input
DAMPING F A C T O R :
50 at 3 ohms output
1 0 0 at 16 ohms output
INPUT S E N S I T I V I T Y AND IMPEDANCE:
Power Amplifier: 3 volts, 1 0 0 , 0 0 0 ohms
Phono 1 and Phono 2: 2 . 5 mV at 1 0 0 0 Hz, 4 7 , 0 0 0 ohms
Tape Head: 3 mV, 4 7 , 0 0 0 ohms
Tape, A u x , and Tuner: 3 0 0 mV, 2 5 0 , 0 0 0 ohms
BASS CONTROLS:
+ 16 dB to -16 dB at 20 Hz
Performance Limits
POWER OUTPUT:
70 watts minimum sine wave continuous average
power output, per channel, both channels operating
into 8 ohms load impedance, which is:
23.7 volts RMS across 8 ohms
40 watts minimum sine wave continuous average
power output, per channel, both channels operating
into 16 ohms load impedance, which is:
25.3 volts RMS across 16 ohms
60 watts minimum sine wave continuous average
power output, per channel, both channels operating
into 4 ohms load impedance, which is:
15.49 volts RMS across 4 ohms
OUTPUT LOAD IMPEDANCE:
4 ohms, 8 ohms, or 16 ohms
RATED POWER BAND:
20 Hz to 20,000 Hz
TOTAL H A R M O N I C DISTORTION:
0.2% maximum harmonic distortion at any power
level from 250 milliwatts to rated power per channel
from 20 Hz to 20,000 Hz, both channels operating
INTERMODULATION D I S T O R T I O N :
0 . 2 % if i n s t a n t a n e o u s peak power output is twice rated continuous
average power or less per channel with both channels o p e r a t i n g
for any combination of frequencies 20 Hz to 2 0 , 0 0 0 Hz
FREQUENCY RESPONSE: (at one w a t t output)
20 Hz to 2 0 , 0 0 0 Hz +0 -0.5 dB
NOISE AND HUM:
power A m p l i f i e r ; 95 dB below rated output
30
TREBLE C O N T R O L S :
+ 16 dB to - 1 6 dB at 2 0 , 0 0 0 Hz
L.F. FILTER:
Active filter, 12 dB per octave roll off below 50 Hz; 20 dB down at
20 Hz
H.F. FILTER:
A c t i v e filter, 12 dB per octave roll off above 7 0 0 0 Hz; 20 dB down
at 2 0 , 0 0 0 Hz
GENERAL
SEMICONDUCTOR
COMPLEMENT:
36 Silicon T r a n s i s t o r s , 22 Silicon R e c t i f i e r s and Diodes, 2 Silicon
B i l a t e r a l Switches, 2 Triac
POWER REQUIREMENTS:
1?0 volts, 5 0 / 6 0 Hz, 7 0 w a t t s at zero signal output, 400 w a t t s at
r a t e d output
FACILITIES AND FEATURES
COMPENSATION SWITCH:
Three position s w i t c h f o r FLAT, LOUOness, or PRESence. LOUDness boosts low frequencies for low level listening. PRESence boosts
mid frequencies 4 dB to increase "presence" effect
TAPE INPUT/MONITOR SWITCHES:
Either of two tape r e c o r d e r s can be played or monitored
TAPE COPY SWITCH:
Two tape recorders can be connected to copy f r o m tape machine 1
to tape machine 2 or vice versa
HEADPHONE J A C K :
For listening with low impedance dynamic stereo headphones
MECHANICAL
SIZE:
Front panel measures 16 inches wide ( 4 0 . 6 4 ) by 5 - 7 / 1 6 inches high
( 1 3 . 8 1 cm). Chassis measures 15 inches wide ( 3 8 . 1 cm) by 13 inches
deep ( 3 3 . 0 2 cm), including PANLOC shelf and back panel connectors.
Knob clearance required is 1-1/2 inches ( 3 . 8 1 cm) in front of mounting panel
FINISH:
Front Panel: Anodized gold and black with special gold/teal panel
nomenclature illumination
WEIGHT:
34 pounds ( 1 5 . 4 2 kg) net, 46 pounds (20.8 7 kg) in shipping carton
WHAT MAKES A GOOD MUSIC SYSTEM GREAT?
...DELICATE MUSICAL PASSAGES ARE REPRODUCED WITH CLEANNESSTHUNDEROUS CRESCENDOS WITH ALL THE INSTRUMENTS CLEARLY DEFINEDAND RESERVE ENERGY TO GO FROM ONE TO THE OTHER WITHOUT TAXING
THE SYSTEM---THESE ARE WHAT MCINTOSH AMPLIFIERS CAN DO FOR YOU.
McIntosh amplifiers have been the "LABORATORY
STANDARD" in vacuum electronics for 20 years.
McIntosh audio scientists have generated solid state
innovations that have continued the McIntosh reputation for "LABORATORY STANDARD". New levels of
performance, even greater reliability, and highest quality
have created levels of cleanness and beauty in music that
until now have been clouded by lower performance
standards.
MCINTOSH ENGINEERING MAKES THE
DRAMATIC DIFFERENCE
Continuing research is a way of life at McIntosh.
"State of the Art" is not satisfactory. Engineering and
experimentation without limits probe the present day
boundaries of instrument performance. This expensive,
far reaching program profits you by producing the best
performance, greatest reliability, useful flexibility and
long trouble free life. Careful examination of space age
advances in electronics, new manufacturing developments
and twenty years of experience in producing the "BEST"
has given McIntosh the leadership in Solid State Electronics.
Performance in an amplifier comes from low distortion and high power capability. McIntosh solid state electronic amplifiers are guaranteed not to exceed 25/100
of 1% distortion at all audio frequencies at all power
levels up to full rated power with both channels operating.
Typical measurements are less than 1/10 of 1%!
You will hear all there is to hear with a clarity and
naturalness never before achieved. And this performance
is guaranteed!
Only McIntosh gives you a money back guarantee on
performance. Every McIntosh instrument must be capable
of meeting its advertised performance limits or you get
a refund of your purchase price. McIntosh promises
performance. We either meet our promise or you get
your money back.
With a McIntosh you get full power output at all
speaker impedances. Full power and full power response
at all speaker impedances comes from a McIntosh development, the MCINTOSH TRIFILAR UNITY COUPLED
AUTOFORMER. Using a McIntosh developed trifilar
winding technique, and careful interleaving of the windings makes the autoformer a near perfect matching
device for all loudspeakers, dynamics and electrostatic.
You get FULL POWER AT ALL SPEAKER IMPEDANCES.
Reliability and long trouble free life comes, in part,
from McIntosh Sentry Monitoring Circuits.
The SENTRY MONITORING CIRCUIT prevents
failure of the power transistors due to excessive mismatch of the output. With the amplifier operating normally the SENTRY MONITORING CIRCUIT has no effect on the signals passing through the power amplifiers.
If the power dissipation should rise above normal, the
SENTRY MONITORING CIRCUIT restricts the drive
voltage to the output transistors. The SENTRY MONITORING CIRCUIT acts instantaneously. You are assured
of complete circuit reliability. McIntosh is the only amplifier with this degree of protection.
To permit you to measure the performance, provide
for correct system balance, and to obtain accurate power
readings McIntosh has developed DYNAMIC PEAK
LOCKING METERS.
Ordinary meters lack the capability of indicating
the short interval power in a sound wave. The mass
of the meter movement is too great to respond to instantaneous changes in music program material. Superior
McIntosh engineering has developed new circuits that
permits the meters to respond to the short interval power
in sound wave to an accuracy of 98% of the true value.
Two new circuits were required to provide the accuracy. The first circuit is an accelerating circuit. It compensates for the inertia characteristics of the meter movement. The second circuit is a "time stretching" circuit.
Short interval power fluctuation is so rapid that the eye
might not perceive the instantaneous power reading.
The "time stretching" circuit holds the meter needle at
peak reading for a few milliseconds to permit the eye
to perceive. The DYNAMIC PEAK LOCKING METERS
represent another major engineering advancement by
McIntosh audio scientists.
And best of all - you are protected for THREE FULL
YEARS from any service costs. With the purchase of a
McIntosh you are offered a FREE THREE YEAR
SERVICE CONTRACT. You can't pay us for the repair
of a McIntosh for the first three years you own it!
McIntosh is the best in PERFORMANCE, RELIABILITY, AND VALUE.
31
MONO POWER AMPLIFIER MC 50
POWER OUTPUT:
50 watts minimum sine wave continuous average
power output, operating into 4 ohms, 8 ohms, or
16 ohms load impedance, which is:
14.1 volts RMS across 4 ohms
20.0 volts RMS across 8 ohms
28.3 volts RMS across 16 ohms
OUTPUT LOAD IMPEDANCE:
4 ohms, 8 ohms, or 16 ohms; separate terminals
are provided for each output
R A T E D POWER BAND:
20 Hz to 20,000 Hz
T O T A L HARMONIC D I S T O R T I O N :
McIntosh audio power ratings are in
accordance with the Federal Trade
0.25% maximum harmonic distortion at any
power level from 250 milliwatts to 50 watts from
20 Hz to 20,000 Hz
Commission Regulation of November
4, 1974 concerning power output
INTERMODULATION
claims for amplifiers used in home
2 0 , 0 0 0 Hz
FREQUENCY RESPONSE: ( a t one w a t t output)
entertainment products.
DISTORTION:
Will not exceed 0 . 2 5 % if instantaneous peak power output is
100
w a t t s or
less for any combination of frequencies 20 Hz to
20 Hz to 2 0 , 0 0 0 Hz +0 - 0 . 2 5 dB
!0 Hz to 1 0 0 , 0 0 0 Hz +0
- 3 . 0 dB
N O I S E AND HUM:
90 dB below rated output
NOISE AND
PERFORMANCE
GUARANTEE-
Performance limits are the maximum
deviation from perfection permitted
HUM:
90 dB below rated output
OUTPUT IMPEDANCE:
4, 8, or 16 ohms
OUTPUT V O L T A G E S :
25 volts for distribution lines
DAMPING F A C T O R :
for a McIntosh instrument. We promise
that
the
instrument you buy
25 at
4 ohms output
50 at
8 ohms output
17 at 16 ohms output
must be capable of performance at
INPUT IMPEDANCE:
or exceeding its limits or you get your
INPUT S E N S I T I V I T Y :
2 0 0 , 0 0 0 ohms
0.5 volt. Level c o n t r o l provided for higher input voltage
money back. McIntosh is the only manufacturer that makes this guarantee.
GENERAL
POWER REQUIREMENTS:
120 volts, 5 0 / 6 0 Hz, 15 watts at zero signal output, 120 w a t t s at
rated output
SEMICONDUCTOR COMPLEMENT:
1 2 silicon t r a n s i s t o r s
12 silicon r e c t i f i e r s and diodes
MECHANICAL
SIZE:
5 - 1 / 2 inches high ( 1 3 . 9 7 cm), 8 inches wide ( 2 0 . 3 2 cm), 1 2 - 1 / 2
inches deep ( 3 1 . 7 5 cm)
CHASSIS:
Chrome and black
WEIGHT:
20 pounds ( 9 . 0 7 kg) net, 24 pounds ( 1 0 . 8 9 kg) in shipping c a r t o n
32
STEREO POWER AMPLIFIER MC 25O
STEREO POWER AMPLIFIER MC 2100
POWER OUTPUT:
POWER
Stereo:
50 watts minimum sine wave continuous average power
output, per channel, both channels operating into 4
ohms, 8 ohms, or 16 ohms load impedance, which is:
14.1 volts RMS across 4 ohms
20.0 volts RMS across 8 ohms
28.3 volts RMS across 16 ohms
Mono:
100 watts minimum sine wave continuous average power
output, operating into 2 ohms, 4 ohms, or 8 ohms load
impedance, which is:
14.1 volts RMS across 2 ohms
20.0 volts RMS across 4 ohms
28.3 volts RMS across 8 ohms
Stereo:
105 watts minimum sine wave continuous average power
output, per channel, both channels operating into 4
ohms, 8 ohms, or 16 ohms load impedance, 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 minimum sine wave continuous average power
output, operating into 2 ohms, 4 ohms, or 8 ohms load
impedance, which is:
20.5 volts RMS across 2 ohms
29.0 volts RMS across 4 ohms
41.0 volts RMS across 8 ohms
OUTPUT:
OUTPUT LOAD I M P E D A N C E :
OUTPUT LOAD IMPEDANCE:
Stereo: 4 ohms, 8 ohms, or 16 ohms; separate terminals are
provided for each output; Mono: 2 ohms, 4 ohms, or 8
ohms; separate terminals are provided for each output
Stereo: 4 ohms, 8 ohms, or 16 ohms; separate terminals are
provided for each output; Mono; 2 ohms, 4 ohms, or 8
ohms; separate terminals are provided for each output
RATED P O W E R BAND:
RATED POWER BAND:
20 Hz to 20,000 Hz
20 Hz to 20,000 Hz
TOTAL HARMONIC DISTORTION:
TOTAL HARMONIC DISTORTION:
Stereo:
0.25% maximum harmonic distortion at any power level
from 250 milliwatts to 50 watts per channel from 20 Hz
to 20,000 Hz, both channels operating
Mono:
0.25% maximum harmonic distortion at any power level
from 250 milliwatts to 100 watts from 20 Hz to 20,000
Hz
Stereo:
0.25% maximum harmonic distortion at any power level
from 250 milliwatts to 105 watts per channel from 20 Hz
to 20,000 Hz, both channels operating
INTERMODULATION DISTORTION:
Stereo:
0.25% if i n s t a n t a n e o u s peak power output is 100 w a t t s or less per channel
with both c h a n n e l s o p e r a t i n g for any combination of f r e q u e n c i e s 20 Hz to
2 0 , 0 0 0 Hz
Mono:
0 . 2 5 % if instantaneous peak power output is 200 w a t t s or less for any
combination of frequencies 20 Hz to 2 0 , 0 0 0 Hz
FREQUENCY RESPONSE: ( a t one watt o u t p u t ]
20 Hz to 20,000 Hz +0 - 0 . 2 5 dB
NOISE AND HUM:
90 dB below rated output
OUTPUT IMPEDANCE:
STEREO 4, 8, and 16 ohms
MONO 2, 4, and 8 ohrns
OUTPUT VOLTAGES:
2 5 v o l t s for d i s t r i b u t i o n lines
DAMPING F A C T O R :
15 at 4 ohms output
38 at 8 ohms output
17 at 16 ohms output
INPUT IMPEDANCE:
2 0 0 , 0 0 0 ohms
INPUT S E N S I T I V I T Y :
0.5 volt. Level control provided for higher input voltage
INTERMODULATION D I S T O R T I O N :
Stereo:
0 . 2 5 % if instantaneous peak power output is 210 w a t t s or less per channel
with both channels operating for any combination of frequencies 20 Hz to
2 0 , 0 0 0 Hz
Mono:
0 . 2 5 % if instantaneous peak power output is 420 w a t t s or less for any
combination of f r e q u e n c i e s 20 Hz to 2 0 , 0 0 0 Hz
FREQUENCY RESPONSE: (at one watt output)
20 HZ to 2 0 , 0 0 0 Hz +0 - 0 . 2 5 dB
NOISE AND HUM:
90 dB or more below rated output
OUTPUT IMPEDANCE:
STEREO 4, 8, and 16 ohms
MONO 2, 4, and 8 ohms
OUTPUT VOLTAGES:
25 v o l t s for distribution lines
DAMPING F A C T O R :
20 at 4 ohms output
14 at 8 ohms output
11 at 16 ohms output
INPUT IMPEDANCE:
2 0 0 , 0 0 0 ohms
INPUT S E N S I T I V I T Y :
0.5 volt. Level control provided for higher input v o l t a g e
Mono:
0.25% maximum harmonic distortion at any power level
from 250 milliwatts to 210 watts from 20 Hz to 20,000
Hz
GENERAL
POWER R E Q U I R E M E N T S :
120 volts, 5 0 / 6 0 Hz, 50 w a t t s at zero signal output, 250 watts at rated
output
S E M I C O N D U C T O R COMPLEMENT:
2 4 silicon transistors
18 silicon r e c t i f i e r s and diodes
GENERAL
POWER REQUIREMENTS:
1 2 0 volts, 5 0 / 6 0 Hz, 50 w a t t s at zero signal output, 4 5 0 w a t t s at rated
output
S E M I C O N D U C T O R COMPLEMENT:
32 silicon transistors
14 silicon rectifiers and diodes
MECHANICAL
SIZE:
7-1/16 inches high ( 1 7 . 9 4 cm), 1 0 - 5 / 8 inches wide ( 2 6 . 9 9 c m ) , 1 5 - 5 / 8
inches deep ( 3 9 . 6 9 cm)
CHASSIS:
Chrome and black
WEIGHT:
36 pounds ( 1 6 . 3 3 kg) net, 40 pounds ( 1 3 . 1 4 kg) in shipping carton
MECHANICAL
SIZE:
7 - 3 / 4 inches high (19.69 cm), 1 1 - 3 / 4 inches wide ( 2 9 . 8 5 cm), i7 inches
deep ( 4 3 . 1 8 cm)
CHASSIS:
Chrome and black
WEIGHT:
57 pounds ( 2 5 . 8 6 kg) net, 6 3 pounds ( 2 8 . 5 8 kg) in shipping carton
33
STEREO POWER AMPLIFIER NIC 2505
POWER OUTPUT:
STEREO POWER AMPLIFIER MC 2105
POWER OUTPUT
50 watts minimum sine wave continuous average power
output, per channel, both channels operating into 4
ohms, 8 ohms, or 16 ohms load impedance, which is:
14.1 volts RMS across 4 ohms
20.0 volts RMS across 8 ohms
28.3 volts RMS across 16 ohms
O U T P U T LOAD IMPEDANCE:
4 ohms, 8 ohms, or 16 ohms; separate terminals are provided for each output
RATED POWER BAND:
105 watts minimum sine wave continuous average power
output, per channel, both channels operating into 4
ohms, 8 ohms, or 16 ohms load impedance, which is:
20.5 volts RMS across 4 ohms
29.0 volts RMS across 8 ohms
41.0 volts RMS across 1 6 ohms
OUTPUT LOAD I M P E D A N C E :
4 ohms, 8 ohms, or 16 ohms; separate terminals are provided for each output
RATED P O W E R BAND:
20 Hz to 20,000 Hz
20 Hz to 20,000 Hz
TOTAL HARMONIC D I S T O R T I O N :
0.25% maximum harmonic distortion at any power level
from 250 milliwatts to 50 watts per channel from 20
Hz to 20,000 Hz, both channels operating
INTERMODULATION D I S T O R T I O N :
0 . 2 5 % if instantaneous peak power output is 1 0 0 watts or less per channel
with both channels operating for any combination of frequencies 20 Hz to
2 0 , 0 0 0 Hz
FREQUENCY RESPONSE: (at one watt Output)
20 Hz to 2 0 , 0 0 0 Hz +0 - 0 . 2 5 dB
10 Hz to 1 0 0 , 0 0 0 HZ +0 -3.0 dB
NOISE AND HUM:
90 dB below rated output
OUTPUT POWER MONITOR METER:
Meter range switch is provided to increase meter sensitivity by 10 dB
or 20 dB. Calibration accuracy at 0 dB reading is +2% at all frequencies;
meter range accuracy is ±5%
OUTPUT IMPEDANCE:
4, 8, and 16 ohms
OUTPUT VOLTAGES:
25 volts for distribution lines
HEADPHONE OUTPUT:
Designed for low impedance dynamic phones
DAMPING FACTOR:
14 at 4 ohms
27 at 8 ohms output
13 at 16 ohms output
INPUT IMPEDANCE/SENSITIVITY:
2 0 0 , 0 0 0 ohms; 0.5 volt. Level control provided for higher input voltage
CONTROLS:
AC Power ON/OFF switch, Speaker ON/OFF switch, Left gain, Right
gain, and Meter range switch
T O T A L H A R M O N I C DISTORTION:
0.25% maximum harmonic distortion at any power level
from 250 milliwatts to 105 watts per channel from 20 Hz
to 20,000 Hz, both channels operating
INTERMODULATION DISTORTION:
0 . 2 5 % if instantaneous peak power output is 2 1 0 w a t t s or less per channel
with both channels operating for any combination of frequencies 20 Hz to
2 0 , 0 0 0 Hz
FREQUENCY RESPONSE: (at one watt output)
20
Hz to 2 0 , 0 0 0
Hz +0
Front panel measures 16 inches wide (40.64 cm) by 5-7/16 inches high
( 1 3 . 8 1 cm). Chassis measures 15 inches wide (38.1 cm) by 5 inches high
( 1 2 . 7 cm) by 13 inches deep ( 3 3 . 0 2 cm), including connectors. Knob
connectors. Knob clearance required is 1-1/2 inches ( 3 . 8 1 cm) in front
of mounting panel.
FINISH:
Panel is glass with anodized gold and black trim specially illuminated.
MOUNTING:
Exclusive McIntosh developed professsional PANLOC
WEIGHT:
38 pounds ( 1 7 . 2 4 kg) net, 53 pounds ( 2 4 . 0 4 kg) in shipping carton
34
dB
90 dB below rated output
Meter range switch is provided to increase meter sensitivity by 10 dB
or 20 dB. Calibration accuracy at 0 dB reading is ± 2 % at all frequencies;
meter range accuracy is ±5%
OUTPUT IMPEDANCE:
4, 8, and 16 ohms
OUTPUT VOLTAGES:
25 volts for distribution lines
HEADPHONE OUTPUT:
Designed for low impedance dynamic phones
DAMPING FACTOR:
18 at 4 ohms output
1 3 at 8 ohms output
1 0 at 16 ohms output
INPUT IMPEDANCE/SENSITIVITY:
2 0 0 , 0 0 0 ohms; 0.5 volt. Level control provided for higher input voltage
CONTROLS:
AC Power ON/OFF switch, Speaker ON/OFF switch, Left gain, Right
gain, and Meter range switch
GENERAL
POWER
REQUIREMENTS:
120 volts, 5 0 / 6 0 Hz, 75 watts at zero signal output, 4 3 0 watts at rated
output
SEMICONDUCTOR COMPLEMENT:
34 silicon transistors; 18 silicon rectifiers and diodes
MECHANICAL
MECHANICAL
SIZE:
-3.0
OUTPUT P O W E R MONITOR METER:
GENERAL
POWER REQUIREMENTS:
120 volts, 5 0 / 6 0 Hz, 75 watts at zero signal output, 250 w a t t s at rated
output
SEMICONDUCTOR COMPLEMENT:
26 silicon transistors; 2 7 silicon r e c t i f i e r s and diodes
- 0 . 2 5 dB
10 Hz to 1 0 0 , 0 0 0 Hz +0
NOISE AND HUM:
SIZE:
Front panel measures 1 6 - 3 / 1 6 inches wide ( 4 1 . 1 2 cm) by 7 - 1 / 8 inches
high (13.1 cm). Chassis measures 15 inches wide ( 3 8 . 1 cm) by 6-9/16
inches high ( 1 6 . 6 7 cm) by 1 4 - 1 / 2 inches deep ( 3 6 . 8 3 cm), including connectors. Knob clearance required is 1-1/2 inches ( 3 . 8 1 crn) in front of
mounting panel.
FINISH:
Front panel is anodized gold and black with special gold/teal nomenclature
illumination. Chassis is chrome and black.
MOUNTING:
Exclusive McIntosh developed professional PANLOC
WEIGHT:
65 pounds ( 2 9 . 4 8 kg) net, 77 pounds ( 3 4 . 9 3 kg) in shipping carton
HEAR ALL THERE
IS TO HEAR
STEREO POWER AMPLIFIER
MC 2300
P O W E R OUTPUT:
Stereo:
300 watts minimum sine wave continuous average power output, per channel, both channels
operating into 0.5 ohm, 1 ohm, 2 ohms, 4 ohms,
8 ohms, or 16 ohms load impedance, which is:
12.2 volts RMS across 0.5 ohm
17.3 volts RMS across 1 ohm
24.5 volts RMS across 2 ohms
34.6 volts RMS across 4 ohms
49.0 volts RMS across 8 ohms
69.3 volts RMS across 16 ohms
Mono:
600 watts minimum sine wave continuous average power output into 0.25 ohm, 0.50 ohm, 1
ohm, 2 ohms, 4 ohms, or 8 ohms load impedance, which is:
12.2 volts RMS across 0.25 ohm
17.3 volts RMS across 0.5 ohm
24.5 volts RMS across 1 ohm
34.6 volts RMS across 2 ohms
49.0 volts RMS across 4 ohms
69.3 volts RMS across 8 ohms
OUTPUT LOAD IMPEDANCE:
Stereo: 0.5 ohm, 1 ohm, 2 ohms, 4 ohms, 8 ohms,
16 ohms; separate terminals are provided for each
output; Mono: 0.25 ohm, 0.5 ohm, 1 ohm, 2
ohms, 4 ohms and 8 ohms; separate terminals are
provided for each output
R A T E D POWER B A N D :
20 Hz to 20,000 Hz
TOTAL HARMONIC D I S T O R T I O N :
Stereo:
0.25% maximum harmonic distortion at any
power level from 250 milliwatts to 300 watts
per channel from 20 Hz to 20,000 Hz, both
channels operating
Mono:
0.25% maximum harmonic distortion at any
power level from 250 milliwatts to 600 watts
from 20 Hz to 20,000 Hz
INTERMODULATION DISTORTION:
Stereo:
0 . 2 5 % if i n s t a n t a n e o u s peak power is 6 0 0 w a t t s or less per channel with both channels operating for any c o m b i n a t i o n of
frequencies 20 Hz to 2 0 , 0 0 0 Hz
Mono:
0 . 2 5 % if instantaneous peak power is 1 2 0 0 w a t t s or less for any
combination of frequencies 20 Hz to 2 0 , 0 0 0 Hz
FREQUENCY RESPONSE: (at one watt output)
Stereo:
20 Hz to 2 0 , 0 0 0 Hz, +0 - 0 . 5 dB; 1 , 4, 8 , or 16 ohms
20 Hz to 2 0 , 0 0 0 Hz, +0 - 1.0 dB; 0.5 or 2 ohms
12 Hz to 3 5 , 0 0 0 Hz, +0 - 1.5 dB
Mono:
20 Hz to 2 0 . 0 0 0 Hz, +0 - 0.5 dB; 0.5 , 2 , 4 , or 8 ohms
20 Hz to 2 0 , 0 0 0 Hz, +0 - 1.0 dB; 0 .2 5 or 1 .0 ohms
12 Hz to 3 5 , 0 0 0 Hz, +0 - 1.5 dB
NOISE AND HUM:
90 dB below rated output
OUTPUT POWER MONITOR METER:
Meter is calibrated to read +3.0 dB when amplifier produces
3 0 0 watts. Meter range switch is provided to i n c r e a s e meter sensitivity by 10 dB or 20 dB. Calibration accuracy at 0 OB reading
is
±2.0%
at all frequencies; meter range accuracy is
OUTPUT V O L T A G E S :
±5.0%
RATINGS
25 v o l t s , stereo and mono; 70 volts, stereo and mono for distribution lines
DAMPING F A C T O R :
27 at 0 . 5 ohm output, 50 at 1 ohm output, 29 at 2 ohms output, 21 at 4 ohms output, 14 at 3 ohms output
INPUT IMPEDANCE:
2 0 0 , 0 0 0 ohms
INPUT S E N S I T I V I T Y :
0.5 volt. Level control provided for higher input voltage
GENERAL
POWER REQUIREMENTS:
1 2 0 volts, 5 0 / 6 0 H z , 1 6 0 w a t t s a t z e r o s i g n a l output, 1 4 0 0
w a t t s at rated output
SEMICONDUCTOR COMPLEMENT:
4 6 silicon t r a n s i s t o r s
1 / silicon r e c t i f i e r s and diodes
MECHANICAL
SIZE:
Front panel measures 19 inches wide (48.26 cm) by 10-1/2 inches
high ( 2 6 . 6 7 cm). Chassis measures If inches wide ( 4 3 . 1 8 cm) by
10 inches high ( 2 5 . 4 cm) by 17 inches deep ( 4 3 . 1 8 cm), including connectors. Clearance in f r o n t of mounting panel including
knobs 2 i n c h e s ( 5 . 0 8 cm)
FINISH:
Front panel is anodized gold and black. Chassis is black baked
enamel.
MOUNTING:
S t a n d a r d 1 9 " ( 4 8 . 2 6 c m ) rack mounting
WEIGHT:
1 2 8 pounds ( 5 8 . 0 6 kg) net, 1 4 3 pounds ( 6 4 . 8 6 kg) in shipping
carton
SPECIAL F E A T U R E S :
The amplifier is c o m p l e t e l y s t a b l e when connected to any loudspeaker system and to any reactive loads. The MC 2 3 0 0 has special c i r c u i t s to prevent damage by short circuit or open circuit of
the output loads, or by any amount of output impedance
mismatch.
Thermal c u t o u t s are mounted on the o u t p u t t r a n s i s t o r heat
s i n k s to p r o v i d e protection in the event of inadequate ventilation.
Peak reading—peak locking meters feature special circuits t h a t
respond to the peak values of complex input signals.
35
McINTOSH LABORATORY INC.
2 CHAMBERS ST., BINGHAMTON, N. Y. 13903
607-723-3512
Printed in U.S.A.
038-961
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