Mcintosh Mc 275 Users Manual

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STEREO POWER
AMPLIFIER

MC275

TABLE OF CONTENTS
GENERAL DESCRIPTION

1

TECHNICAL DESCRIPTION
Electrical Specifications
Mechanical Specifications

1
3
3

PANEL FACILITIES
Input
Output
Line Output
Fuse
AC Outlet
Line Voltage

4
4
4
4
4
4
5

INSTALLATION

5

CONNECTIONS
Input—Stereo
Input—Twin Amp
Input—Mono

5
5
5
5

Speakers—Stereo or Twin Amp
Speakers—Mono
Line Output—Stereo or Twin Amp
Line Output—Mono
AC Power

5
6
6
6
7

OPERATION

7

ADJUSTMENTS
Line Voltage
Input Switch

7
7
7

GUARANTEE

8

FREE 3-YEAR FACTORY SERVICE
CONTRACT APPLICATION

cover pocket

SCHEMATIC DIAGRAM

cover pocket

PARTS LIST

cover pocket

RESISTANCE AND VOLTAGE CHART

cover pocket

MC275 STEREO POWER AMPLIFIER
GENERAL DESCRIPTION
Over one million watts of amplifier output
power capacity have been manufactured by
Mclntosh since 1947. In this 1,000,000 watts
of audio power there are less than 10 watts of
distortion capacity and less than 1/100 watt
of noise capacity!
The dramatic difference in the quality of
music reproduction when you listen through
Mclntosh instruments is directly due to low
distortion performance. Careful, devoted
research is a way of life at Mclntosh. The
world's finest amplifier is the creation of persevering, resourceful Mclntosh engineers.
Mclntosh Laboratory is the only manufacturer in the entire industry to guarantee the
lowest distortion at all audio frequencies, at
full power. The U.S. Patent Office has recognized the advanced technology of the
Mclntosh circuit by granting 6 patents.1

Long life, flexibility, highest quality construction are characteristic designs in every
Mclntosh instrument. Wide electrical and
thermal margins of safety for all components
and tubes, advanced engineering, and cool
operating design add to the long life built
into every Mclntosh product. Reliability prolongs your investment without expensive
maintenance costs.
The MC275 has on one chassis two 75
watt power amplifiers. In addition to use as a
stereo amplifier, the flexibility of the MC275
permits it to be used as a monophonic
amplifier that delivers 150 watts, or as two
separate 75 watt amplifiers with each channel amplifying completely separate programs, or as two amplifiers for use with an
electronic crossover network. Such flexibility permits maximum use for greatest
return from your investment.

TECHNICAL DESCRIPTION
The patented Mclntosh Unity Coupled
circuit and output transformer have established Mclntosh amplifiers as the unchallenged leaders in the audio field.
Before 1947, low distortion at high power
and high efficiency was impossible. A completely new engineering approach resulted in
an amplifier that for the first time permitted
high power with distortion below 1%. That
new engineering produced the Mclntosh
Unity coupled circuit and the Mclntosh bifilar
wound output transformer. With the introduction of the Mclntosh amplifier new standards for distortion-free performance were
established.

turn of primary number one is next to the
same turn of primary number two. There is
almost complete magnetic coupling between
the two wires. The magnetic coupling is reinforced by the capacitance between the
two wires.

INPUT

OUTPUT

PRIMARY NO. I

PRIMARY NO. 2

Fig. 1—Representation of bifilar winding.

The Mclntosh output transformer is
unique. It has two primary windings which are
wound bifilarly. In the bifilar technique both
primary wires are wound side by side. Each

Fig. 2—Representation of Mclntosh output circuit.

1

U.S. Patent No's: 2,477,074; 2,545,788; 2,646,467; 2,654,058; 2,860,192; 2,929,028.

1

In the Mclntosh Unity Coupled circuit one
of the bifilar primary windings is connected
through the power supply to the plate and
cathode of one of the output tubes. The other
bifilar primary winding is similarly connected
to the other tube.
All low distortion high power amplifiers
use push-pull output circuits known as Class
AB1, AB2 or B. Two tubes are arranged in a
balanced circuit. This permits each tube to
operate alternately somewhat over half the
time. Compared to full time operation of the
tubes, the push-pull method reduces heating
and permits more power from a given type of
tube. Despite this advantage of the conventional push-pull circuit one problem in particular remained to be solved. When current
in each tube is cut off to begin the idle period
distortion is produced at the instant of cut
off and again at the instant when current
flows. This form of distortion is known as
Notch Distortion and was well illustrated by
Mr. Pen Tung Sah in the "Proceedings of the
I.R.E." Volume 24, pp 1522-1541 in 1936.
Imperfect coupling between the primary
windings found in all conventional output
transformers produces the condition which
permits notch distortion. Trying to improve
coupling in a conventional transformer decreases the power response at both low and
high frequencies, heating the output tubes
and lowering the available power output.
The Mclntosh Unity Coupled output circuit and bifilar transformer is the first commercial breakthrough that eliminates notch
distortion by coupling both output tubes
almost to perfection. In the Mclntosh transformer the extremely close coupling of the
bifilar windings removes the condition which
permits notch distortion. Furthermore the
the two output tubes are arranged as partial
cathode followers. Half of the output circuit
is in the cathode and half in the plate of each
tube. The output tubes now are operating in
a local feedback loop which, reduces their
distortion, reduces their internal generator
resistance, and reduces their balance
requirements. The Mclntosh circuit in
reality perfects push-pull high efficiency

2

output circuits.
The MC275 uses an advanced design of
the Mclntosh output transformer. The new
transformer design incorporates all of the
benefits of the original Mclntosh design and
even further improves the power band width.
The MC275 output transformer has three
primary windings, wound trifilarly. The new
third winding is connected between the
plates of the cathode follower driver.
Leakage inductance (lack of coupling)
between the primary and secondary windings of the output transformer limits the high
frequency response of an amplifier. The
primary and secondary windings of the
Mclntosh output transformer are interleaved
five times to improve coupling. The interleaving is accomplished by winding groups of
primary layers, then secondary layers alternately until the total transformer is wound.
Interleaving helps to extend the Mclntosh
power band width to over 100,000 cycles.
Since 1947 this new technology has been
built into every Mclntosh power amplifier.
Good voltage regulation in the power
supply permits overloads without overshoot
or blocking, good transient response, and
complete stability. To improve regulation a
silicon rectifier power supply is used in the
MC275. In addition to better voltage regulation, the silicon rectifier allows even higher
operating efficiency, cooler operation, and
longer amplifier life."
To greatly extend tube and component
life a thermistor in the MC275 limits current
surges produced when the equipment is
turned on. The thermistor is a special type of
resistor. Its resistance depends on its temperature. When the amplifier is off the thermistor has a high resistance value (about 79
ohms). Just after the amplifier is turned on
the current which flows through the thermistor heats it and causes its resistance to
decrease to a low value (less than .7 ohms).
Current is thus limited when the MC275 is
first turned on but is not limited as the unit
warms.

ELECTRICAL

Power Output:
Stereo or twin amplifier—75 watts continuous per channel
Monophonic—150 watts continuous
Harmonic Distortion:
Less than 0.5% at rated output or less,
20 cycles through 20,000 cycles. Typical
performance is 0.3% or less at 20 cycles
and 20,000 cycles at full power. Typical
performance in the mid frequencies is
0.1% or less at full power.
Intermodulation Distortion:

Less than 0.5% for any combination of
frequencies from 20 cycles through
20,000 cycles if instantaneous peak
power is below twice the rated power.
Phase Shift:
Less than ±8° 20 cycles through 20,000
cycles
Frequency Range:
At rated output:
+0, -0.1 db 16 cycles through 40,000
cycles
+0, -0.5 db 16 cycles through 60,000
cycles
At one-half rated output:
+0, -1 db 10 cycles through 100,000
cycles
Noise and Hum:
90 db or more below rated output
Output Impedance:
Stereo or Twin Amp:
(Isolated from ground) 4 ohms, 8 ohms,
16 ohms
(Center tap internally grounded) 600
ohms
(One side internally grounded) 67 ohms,
150 ohms
Mono:
(Isolated from ground) 2 ohms, 4 ohms,
8 ohms, 16 ohms, 32 ohms

MECHANICAL

Dimensions:
Chassis dimensions: 17¼" long x 12¼'
wide x 8" high. (See INSTALLATION on
Page 5 for minimum mounting space.)
Weight:
Chassis only—67½ pounds. In shipping
carton—76 pounds.

SPECIFICATIONS

(Center tap internally grounded) 300
ohms
(One side internally grounded) 34 ohms,
75 ohms
Output Voltage:
Stereo or Twin Amp:
(Isolated from ground) 25 volts
(Center tap internally grounded) 230
volts
(One side internally grounded) 70.7
volts, 115 volts
Mono:
(Isolated from ground) 25 volts, 70.7
volts
(Center tap internally grounded) 230
volts
(One side internally grounded) 70.7

volts, 115 volts
Internal Impedance:
Less than 10% of rated load impedance
Input:
Input impedance—250,000 ohms
Input sensitivity—0.5 volts to 30 volts
through gain control with input switch in
MONO or TWIN AMP position. With the
switch in the STEREO position, sensitivity is 2.0 volts through a balance
control.
Power Requirements:
105 volts to 130 volts at 50/60 cycles:
240 watts at zero signal output: 400
watts at rated output. The power transformer is tapped for 117 volts and 125
volts.
Tube Complement:
Voltage Amplifier—One 12AX7 (drives
both amps)
Phase Inverter—Two 12AU7
Drive Amplifier—Two 12BH7
Cathode Follower Drive—Two 12AT7 or
12AZ7
Output—Four KT88 or 6550

SPECIFICATIONS

Finish:
Chromium and Black
Accessories Supplied:
Owners Manual
Mounting Template
Mounting Flanges
Octal output plug with cap
3

PANEL FACILITIES

Fig. 3—The end panel of the MC275 showing all input and output facilities.

INPUT
The input of the MC275 has a three position lever switch to permit the amplifier to be
used in any one of three ways:
(1) As a monophonic 150 watt amplifier
(2) As twin 75 watt amplifiers used with an
electronic crossover network, or two
completely separate amplifiers, or in
stereo applications requiring 0.5 volt
sensitivity in the power amplifiers
(3) As a stereo amplifier used with a
Mclntosh preamplifier or other high
output stereo program sources.
The input marked STEREO has a sensitivity of 2.0 volts controlled by a BALANCE
control. The input impedance is 250,000
ohms.
The input marked TWIN AMP has a sensitivity of 0.5 volt. Each TWIN AMP input is
controlled by a GAIN control. The GAIN control allows signal sources with output from
0.5 volt up to 30 volts to be connected without overloading the input to the amplifier.
The input impedance is 250,000 ohms.
The input marked MONO has a sensitivity
of 0.5 volt. The MONO position of the input
switch parallels the inputs to both amplifiers. When the outputs are properly connected the MC275 becomes a 150 watt
monophonic amplifier. The MONO input has
a GAIN control that permits connecting signal
sources up to 30 volts without overloading
the amplifier's input. The input impedance
is 250,000 ohms.
OUTPUT
The two barrier terminal strips marked
OUTPUT provide stereo connections for the
normal speaker impedances of 4 ohms,
8 ohms, and 16 ohms. For monophonic oper4

ation connections for 2 ohms, 4 ohms, 8
ohms, 16 ohms, and 32 ohms are provided.
The terminal strips may also be connected
for a constant voltage output of 25 volts in
either stereo or mono, or for 70.7 volts
in mono.
The secondary of the Mclntosh output
transformer may be operated either grounded
or not grounded. As supplied, the secondary
of the MC275 is not grounded. If grounding
is desirable a wire may be connected between chassis and common of either or both
output terminal strips.
The barrier strip output connections are
fed from the secondary of the output transformer,
LINE OUTPUT (See also pages 5, 6 and 7)
The octal socket marked LINE OUTPUT
has connections for 70.7 volts, 115 volts,
230 volts, or 600 ohms for stereo operation.
For monophonic operation the octal socket
provides connections for 70.7 volts, 115
volts, 230 volts, or 300 ohms.
The 600 ohm winding and the 300 ohm
winding are balanced to ground. Pin 1 of the
octal socket is the center tap for these windings and is grounded.
The connections at the octal socket are
fed from taps on the cathode winding in the
primary of the output transformer.
FUSE

The MC275 uses a 5.0 ampere slo-blo
type fuse. The auxiliary AC socket 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 MC275 operates on any line voltage be-

tween 105 volts and 130 volts, 50 cycles to 60
cycles. The switch marked LINE VOLTAGE
changes the tap on the primary of the power
transformer. The switch can be adjusted at
any time.

INSTALLATION
Adequate ventilation extends the troubleend of the amplifier that hold the bottom
free life of electronic instruments. It is
cover to the chromium chassis. Place the
generally found that each 10° centigrade
square edge of the mounting flange with the
(18° F) rise in temperature reduces the life of
three round holes positioned over the three
electrical insulation by one half. Adequate
holes in the bottom cover. The three holes in
ventilation is an inexpensive and effective
the mounting flange will line up over the
means of preventing insulation breakdown
three holes in the chassis. Replace the three
that results from unnecessarily high operatself tapping screws through the mounting
ing temperatures. The direct benefit of adeflange and bottom cover. The mounting
quate ventilation is longer, trouble-free life.
flange is now firmly attached to the ampliThe suggested minimum space for mountfier. The mounting flange on the other end of
ing the MC275 is 20" long x 14" wide x 10"
the amplifier is installed in the same way.
high. Always allow for air flow either by
ventilation holes or space next to the bottom
of the amplifier and a means for the warm
air to escape at the top.
The MC275 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 transformers be on the
down side. The advantage of this position is
that the flow of heat from the tubes rises
Fig. 4—Bottom of MC275 with mounting flanges attached.
vertically and does not tend to heat the
transformers.
Place the MC275 mounting template on
If the MC275 is to be permanently mounted
the area where the amplifier is to be mounted.
use the two mounting flanges supplied with
Center punch the mounting shelf through
the amplifier. The flanges are shipped sepathe 4 slotted holes in the mounting flanges
rately and must be attached to the amplifier
shown on the template. Remove the template
bottom at each end.
and install four #10 round head screws in
Turn the MC275 over with the transformthe center punch marks. Do not tighten these
ers down and place it on a piece of cloth or
screws. Place the amplifier over the screw
cardboard to prevent scratches. The ampliheads and slide the amplifier to either side
fier is shipped with 4 plastic feet on the botin the slotted holes of the mounting flanges.
tom cover. Remove the 4 plastic feet. ReThe # 10 wood screws can then be tightened
move the three self tapping screws at one
securely.
CONNECTING THE MC275
INPUT-STEREO

The shielded cable from the left output of
the Mclntosh preamplifier is plugged into
the jack marked STEREO INPUT-L The
shielded cable from the right output of the
Mclntosh preamplifier is plugged into the
jack marked STEREO INPUT-R.
INPUT-TWIN AMP

The shielded cable from the left program
source is plugged into the jack marked
TWIN INPUT-L The shielded cable from the

right program source is plugged into the
jack marked TWIN INPUT-R.
INPUT-MONO

The shielded cable from the program
source is plugged into the jack marked
MONO INPUT.
OUTPUT-STEREO OR TWIN AMPLIFIERS

For stereo or twin channel operation it is
not necessary to use the same impedance
load on each output. Simply connect each
output for the impedance desired.
5

Warning: Do not parallel the amplifier outputs when using the amplifier as a stereo
amplifier or twin channel amplifier. Damage
to the output tubes may result if parallel
operation is attempted when the output voltages are not the same phase and amplitude.
Speakers are connected at the barrier
strips marked OUTPUT on the left end of
the panel.
In compliance with the National Electrical
Code, Class II wiring can be used between
the speaker and the amplifier at the 4 ohm,
8 ohm, or 16 ohm connection. Class II wiring
is lamp cord, bell wire, or other wire with
this type of insulation. For the normally short
distances of under 100 feet between the
amplifier and speaker, #18 wire or larger
can be used. For distances over 100 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 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 barrier strip.
Connect one left speaker Connect one right speaker
If the speaker lead to screw LEFT-COM lead to the screw marked
and the other to:
impedance is:
RIGHT-COM and the other to:
LEFT-4
RIGHT-4
4 ohms
8 ohms

LEFT-8

RIGHT-8

16 ohms

LEFT-16

RIGHT-16

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.
Use this table to determine proper speaker
connections:
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
OUTPUT-MONOPHONIC

When the MC275 is to operate as a 150
watt monophonic amplifier, the outputs of
the two channels combine to produce a
single 150 watt output. This chart lists the
proper connections and interconnections for
monophonic operation.
6

If the Connect one speaker
speaker
lead to the screw
impedance marked LEFT-COM
is:
and the other to:

Connect a
wire between:

Connect another
wire between:
LEFT-4 and
RIGHT-4

2 ohms

LEFT-4

LEFT-COM and
RIGHT-COM

4 ohms

LEFT-8

LEFT-COM and
RIGHT-COM

LEFT-8 and
RIGHT-8

8 ohms

LEFT-16

LEFT-16 and
RIGHT-16

16 ohms

RIGHT-8

LEFT-COM and
RIGHT-COM
RIGHT-COM and
LEFT-8

32 ohms

RIGHT-16

RIGHT-COM and

—

—

LEFT-16

When connected as outlined the MC275
operates as a 150 watt monophonic amplifier.
LINE OUTPUT-STEREO or TWIN AMPLIFIERS

The octal socket marked LINE OUTPUT
has connections for 70.7 volts, 115 volts and
600 ohms. The 25 volt line is fed from the
barrier strips.
For 25 volt line operation connect one of
the left leads to the screw marked COM on
the LEFT barrier strip. The other left lead is
connected to the screw marked 8 on the
LEFT barrier strip. Connect the right leads
in the same manner on the RIGHT barrier
strip.
The 67 ohm and 70.7 volt connections are
the same. To connect for 67 ohm or 70.7
volt operation the octal plug supplied in the
hardware bag is used. Solder one of the left
leads to pin #7 and the other to pin #1.
Solder one of the right leads to pin #8 and
the other to pin #1. Pin #1 is the ground
side.
The 600 ohm connections for the left side
are made between pin #2 and pin #3. The
600 ohm connections for the right side are
made between pin #4 and pin #5. The 600
ohm winding is balanced to ground. Pin #1
on the octal socket is the center tap of the
600 winding. Pin #1 is grounded.
For all applications using 600 ohms use
Class I wiring if the installation must meet
the requirements of the National Electrical
Code.
LINE OUTPUT-MONOPHONIC

The octal socket marked LINE OUTPUT
has connections for operating the MC275
monophonically at 70.7 volts, 115 volts or
300 ohms. For operating at 25 volts connections are made at the barrier strips.
To feed a 25-volt line, connect one side to
the screw marked COM on the LEFT barrier
strip. Connect the other side to the screw
marked 8 on the LEFT barrier strip. Then
connect with a wire the screw marked COM
on the LEFT barrier strip to the screw marked

COM on the RIGHT barrier strip. Connect,
with another wire, the screw marked 8 on the
LEFT barrier strip to the screw marked 8 on
the RIGHT barrier strip.
The 34 ohm and the 70.7 volt connections are the same. To connect for 34 ohms
or 70.7 volts solder one of the leads to pin
#1 in the octal socket. The other lead is
soldered to pin #7. A wire is connected between pin #7 and pin #8.
For 150 watt monophonic operation 70.7
volts is available from the secondary of the
output transformers, isolated from ground.
Connect one lead to the terminal strip screw
marked LEFT-COM and the other lead to the

screw marked RIGHT-16. Connect a wire
between RIGHT-COM and LEFT-16.
To connect for 300 ohms one lead is
soldered to pin #2. The other lead is soldered to pin #3. Connect pin #2 to pin #4
with a wire. With another wire connect pin
#3 to pin #5. Pin #1 is the center tap of the
300 ohm winding. The 300 ohm winding is
balanced to ground.
AC POWER
The MC275 operates on 105 volt to 130
volt, 50 to 60 cycle power. The amplifier will
be turned on and off if its power cord is
plugged in one of the auxiliary AC outlets on
the program source.

OPERATING THE MC275
Before turning the MC275 on check all
connections and plugs to see that they are
firmly and correctly connected. Check to
make sure that the tubes are firmly seated

in the proper sockets. After the following
adjustments have been completed the MC275 will operate without any further attention.

ADJUSTMENTS
LINE VOLTAGE
The LINE VOLTAGE switch should be set
to the position that more closely matches the
average line voltage in your area. The local
electric power company can usually tell you
the average line voltage in your area. If the
line voltage is between 105 volts and 120
volts put the LINE VOLTAGE switch in the 117
volt position. If the line voltage is between
120 volts and 130 volts put the switch in the
125 volt position. If the line voltage is unknown, it is safer to operate with the switch
in the 125 volt position.
INPUT SWITCH
STEREO
With the input switch in the left position
marked STEREO the input of the MC275 is
connected to the two jacks marked STEREO
INPUT located below the BALANCE control.
The amplifier has an input sensitivity in this
position of 2.0 volts. This position has been
provided to be used with Mclntosh preamplifiers or any other high output preamplifiers.
The BALANCE control assists in balancing
the overall stereo system for equal loudness.
Equal loudness is affected by room acoustics, furniture placement, speakers and
many other things. With a monophonic signal
adjust this control until both loudspeakers
are equal in sound output.
TWIN AMP
With the input switch in the center posi-

tion marked TWIN AMP, the input of the
MC275 is connected to the two jacks marked
TWIN INPUT located below the two center
control knobs marked GAIN. The input sensitivity in this position is 0.5 volt. This position
has been provided for use with a low output
stereo preamplifier, an electronic crossover
network, or as two completely separated
monophonic 75 watt amplifiers.
The two center control knobs marked
GAIN should be adjusted to match the input
sensitivity of the MC275 to the output voltage
of the program source equipment.
To balance a stereo system using the
TWIN AMP input position 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 GAIN control on the LEFT input until the loudness in
the room is not quite 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 most convenient
amount of loudness change when using the
volume control on the source equipment.
MONO
With the switch in the right position
marked MONO the inputs of the MC275 are
internally connected in parallel to the jack
7

marked MONO INPUT. This jack is located
below the right control knob marked GAIN.
The input sensitivity in this position is 0.5
volt. The GAIN control should be adjusted to
match the input voltage sensitivity of the
MC275 to the output voltage of the program
source.
For maximum flexibility set the GAIN control as follows: turn the volume control on
the program source equipment (i.e. tape
recorder, tuner, preamplifier, etc.) to the
12 o'clock (half rotation) position. Turn the
GAIN control on the MC275 until the loudness of the sound from the speaker is just a
little louder than you normally like to listen.
The volume control on the program source
equipment now has the most convenient
amount of loudness change in either direction from the 12 o'clock position.

IMPORTANT

The excellent performance that is inherent in all Mclntosh amplifiers does not
depend on the critical adjustment of bias or
balance controls in the output circuit. The
patented Mclntosh circuit delivers its advertised specifications without any need for
these controls and is not dependent on carefully balanced tubes for its performance.
With Mclntosh you can install the amplifier
and forget it.
The MC275 you have purchased will give
you years of pleasant and satisfactory performance. If you have any questions concerning the operation or maintenance of this
amplifier please contact:
Customer Service
Mclntosh Laboratory, Inc.
2 Chambers Street
Binghamton, New York
Our telephone number is 723-5491.
The direct dial area code is 607.

GUARANTEE
Mclntosh Laboratory Incorporated guarantees this equipment to perform as advertised. We also guarantee the mechanical and
electrical workmanship and components of
this equipment to be free of defects for a

period of 90 days from date of purchase.
This guarantee does not extend to components damaged by improper use nor does it
extend to transportation to and from the
factory.

3-YEAR FACTORY SERVICE CONTRACT
An application for a FREE 3-YEAR FACTORY SERVICE CONTRACT is included in the
pocket in the back cover of this manual. The
FREE 3-YEAR FACTORY SERVICE CONTRACT
will be issued by Mclntosh Laboratory upon
receipt of the completely filled out application form. The term of this contract is defined

in the 3-year factory service contract. If the
application is not mailed to Mclntosh Laboratory only the services offered under the
standard 90-day guarantee will apply on this
equipment. TAKE ADVANTAGE OF 3 YEARS
OF FREE FACTORY SERVICE BY FILLING
IN THE APPLICATION NOW.

In Canada: Manufactured under license by:
McCurdy Radio Industries, Ltd.
22 Front Street West
Toronto, Canada
Design subject to change without notice.

8

LABORATORY, INC.
2 CHAMBERS STREET, BINGHAMTON, N. Y.
Made In U.S.A.
Phone-Area Code 607-723-5491

Printed in U.S.A.



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