McIntosh C-27 Owners manual
THE McINTOSH C27 SOLID STATE STEREO PREAMPLIFIER
Reading Time: 28 Minutes
Price: $2-00
WARNING: TO PREVENT FIRE OR SHOCK
HAZARD, DO NOT EXPOSE THIS UNIT TO
RAIN OR MOISTURE.
The Mclntosh you have purchased has a serial number located on
the rear panel of the chassis.
Record that serial number here
for future references. The model and serial number are important
to you for any future service.
Your C 27 Stereo Preamplifier will give you
many years of pleasant and satisfactory
performance. If you have any questions,
please contact:
CUSTOMER SERVICE
Mclntosh Laboratory Inc.
2 Chambers Street
Binghamton, New York 13903
Phone: 607-723-3512
Take Advantage of 3 years
of FREE Service ...
Fill in the Application NOW.
Contents
SERVICE CONTRACT . . . . 1
INTRODUCTION . . . . 2
HOW TO INSTALL .... 2
HOW TO CONNECT .... 4
WHAT THE FRONT PANEL CONTROLS
AND HOW TO USE THEM .... 8
BALANCING YOUR STEREO .... 11
PERFORMANCE LIMITS AND RATINGS . . . . 12
PERFORMANCE CHARTS . . . . 13
TECHNICAL DESCRIPTION .... 14
BLOCK DIAGRAM .... 15
THREE YEAR SERVICE CONTRACT
An application for a FREE THREE YEAR SERVICE CONTRACT is included with this manual.
The terms of the contract are: mishandling is not covered by the SERVICE
CONTRACT.
4. The SERVICE CONTRACT is issued to you as
1. Mclntosh will provide ail parts, materials and
labor needed to return the measured performance of the instrument to the original performance limits free of any charge. The
SERVICE CONTRACT does not cover any
shipping costs to and from the authorized
service agency or the factory.
2. Any Mclntosh authorized service agency will
repair all Mclntosh instruments at normal
service rates. To receive the free service
under the terms of the SERVICE CONTRACT,
the SERVICE CONTRACT CERTIFICATE must
accompany the instrument when taken to
the service agency.
3. Always have service done by a Mclntosh
authorized service agency. If the instrument
is modified or damaged, as a result of unauthorized repair the SERVICE CONTRACT
will be cancelled. Damage by improper use or
the original purchaser. To protect you from
misrepresentation this contract cannot be
transferred to a second owner.
5. For your protection Mclntosh selects only
dealers who have technical competence to
guide purchasers fairly, and provide service
when necessary. To receive the SERVICE
CONTRACT your purchase must be made
from a Mclntosh franchised dealer.
6. Your completely filled in application for a
SERVICE CONTRACT must be postmarked
within 30 days of the date of purchase of the
instrument.
7. To receive the SERVICE CONTRACT all information on the application must be filled
in. The SERVICE CONTRACT will be issued
when the completely filled in application is
received at Mclntosh Laboratory Incorporated
in Binghamton, New York.
Copyright © 1977 by Mclntosh Laboratory Inc.
How to Connect
CONNECTING A TURNTABLE TO PHONO 1
Connect the cable from the "left" channel of the turn-
table into the L PHONO 1 INPUT jack.
Connect the cable from the "right" channel of the turn-
table into the R PHONO 1 INPUT jack.
PHONO 2 is provided for the use of a second turntable.
Connect the cable from the "left" channel of the turn-
table into the L PHONO 2 INPUT jack.
Connect the cable from the "right" channel of the turn-
table into the R PHONO 2 INPUT jack.
Plug the AC power cable from the turntable into the red
unswitched POWER outlet on the rear panel. The red
receptacle is on at all times. It is necessary to turn off the
turntable with its own AC power switch. This arrangement
protects the turntable.
The four black AC power outlets are controlled by the
front panel POWER switch. Use these outlets for a tuner,
tape recorder, etc.
GROUND CONNECTION
A single ground post is provided. Grounds for turntables,
record changers, tape decks, etc. are to be connected to
this post. The left and right program cables and the ground
wire from that source should be wound or twisted together.
To avoid hum make sure the ground wire does not make
any connections to the shields of the left and right program
cables between the program source and the C 27.
CONNECTING A STEREO TUNER
Connect the cable from the "left" channel tuner output
to the L TUNER INPUT jack.
Connect the cable from the "right" channel tuner output
to the R TUNER INPUT jack.
AUX—Any high level program source such as a tuner,
a TV set or a tape recorder can be connected to the AUX 1
and 2 INPUT jacks. The connecting procedure is the same
as for the tuner input.
CONNECTING TAPE RECORDERS
To Record:
Connect a cable from the L TAPE 1 OUTPUT jack to the
left high level input of the tape recorder.
Connect a cable from the R TAPE 1 OUTPUT jack to the
right high level input of the tape recorder.
Connect a second recorder in the same manner to the
TAPE 2 OUTPUT jacks.
To Playback/Monitor:
Connect a cable from the left channel output of a tape
recorder to the L TAPE 1 INPUT jack.
Connect a cable from the right channel output of a tape
recorder to the R TAPE 1 INPUT jack.
Connect a second recorder in the same manner to the
TAPE 2 INPUT jacks.
4
FM ANTENNA
TUNER
TURNTABLE #1
TURNTABLE #2
AC POWER TO
TUNERS, TAPE
RECORDERS AND
POWER AMPLIFIERS
AC POWER
TO TURNTABLES
TAPE
RECORDER
1
CONNECTIONS FOR TUNERS, TURNTABLES, AND TAPE RECORDERS
5
TAPE
RECORDER
2
POWER AMPLIFIER
LOUDSPEAKER
ENVIRONMENTAL
EQUALIZER
SPEAKER SYSTEM #1
SPEAKER SYSTEM #2
CONNECTIONS FOR POWER AMPLIFIER AND LOUDSPEAKERS
6
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