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To balance a stereo system using the
TWIN AMP input position use a monophonic
signal from the program source. A mono-
phonic signal supplies the same voltage to
both channels. Turn the volume control on
the source equipment to the 12 o'clock posi-
tion (half rotation). Turn up the GAIN con-
trol 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 MC240 are
internally connected in parallel to the jack
The excellent performance that is inher-
ent 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 adver-
tised specifications without any need for
these controls and is not dependent on care-
fully balanced tubes for its performance.
With Mclntosh you can install the amplifier
and forget it.
Mclntosh Laboratory Incorporated guar-
antees this equipment to perform as adver-
tised. We also guarantee the mechanical and
electrical workmanship and components of
this equipment to be free of defects for a
An application for a FREE 3-YEAR FAC-
TORY 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 applica-
tion form. The term of this contract is defined
8
IMPORTANT
GUARANTEE
3-YEAR FACTORY SERVICE CONTRACT
In Canada: Manufactured under license by:
McCurdy Radio Industries, Ltd.
22 Front Street West
Toronto, Canada
Design subject to change without notice.
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
MC240 to the output voltage of the program
source.
For maximum flexibility set the GAIN con-
trol 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 MC240 until the loud-
ness 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 direc-
tion from the 12 o'clock position.
The MC240 you have purchased will give
you years of pleasant and satisfactory per-
formance. If you have any questions con-
cerning 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.
period of 90 days from date of purchase.
This guarantee does not extend to compo-
nents damaged by improper use nor does it
extend to transportation to and from the
factory.
in the 3-year factory service contract. If the
application is not mailed to Mclntosh Labo-
ratory 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.
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