McIntosh MC-60 User manual

I}ISTRUOTIO}I ]l|A}IljAL
Mcll{T0SH M0DEt MC-60
6(l WATT P(lWER AMPTIFIER
Type A-121
Seriol No . 4496
McINTOSH TABORATORY, lNC.
2 Chqmbers St. Binghomton, N. Y.
'; "' u's'A'
l rvl-1457-llPB
f,
i'

ELECTRICAL AND MECHANICAL SPECIFICATIONS
Specifications for the Mclntosh Model MC-60 Audio Amplifier
Power Supply
Power Consumption
Power Output
Input Level
Frequency Range
Harmonic Distortion
Intermodulation Distortion
Impulse Distortion
Noise and Hum Level
f)ampi.g Factor
Input Impedance
Output Impedance
Phase Shift
Ttrbe Complement
Auxiliary Equipment
Size
Weight
Finish
ll7 / 125 volts, 50/60 cycles
280 watts at 60 watts output
155 watts at zero signal otrtput
60 watts continuous
Input # l, 0.5 volts to 30 volts, with gain control
Input #2,2.5 volts (for use with Mclntosh Atrdio Com-
pensators and Pre-Amps)
20 to 30,000 cycles -r- .1 db at 60 watts output
16 to 60,000 cvcles +- .5 db at 60 watts otrtptrt
10 to 100,000 cycles -+ 1.0 db. at 30 watts orrtptrt
Less than 0.5% at 60 watts output or less, 20 to 20,000
cycles
Less than 0.5% if instantaneous peak power is below
120 watts
Negligible
90 clb or more below rated otrtput
12 or better for 4, B, and 16 ohm output, 16 for 600
ohms
0.5 meg for 0.5 volt input and 0.13 meg for 2.5 r'olt
input, 20 cycles to 40 KC
1, B, 16 and 600 ohms (600 ohm is balanced to grorrnd)
-+ Bo 20-20,000 cycles
Rectifier:
Pre-Amp:
Phase fnverter: L?AIJ7
Voltage Amp: 12F.}I7
2-5TJ+cA
12AX7
r2AX7
2-6550
Connection
Driver:
Output:
Designed to power C-4, C-B and other Mclntosh pre-
amplifiers
14" x 10" x B" high, chassis type construction
46 pounds net
Chrome and Black
-3--
page 2 was blank

DESCRIPTION
The Mclntosh Model MC-60 is a 60 watt high fidelity power amplifier designed for home entertainment
systems and professional applications where high power and distortion free- pe_rforqralge_ is _required' The
Model MC-6b, fke all othei Mclntosh powerampnngrs, uses the exclusive Mclntosh high.efficiency output
circuit and bifilar output transformer to obtain th; high_ standard of _perform-ance found in- this. amplifier.
Some of the more important characteristics of the amplifier are: less than 0.!% harmoaic distortion at-?\'{
po*". output up to 6b watts and at anY-fre-quency 4^tt: audio spectrum,.20 to 20,00O cps; less-than0.5/o
intermoduiation distortion for all power'levels up io 120 instantaneous peak watts; and noise and hum level
90 db or more below the rated output level.
The MC-60 has two high impedance inputs and may be operated from any signal source deJivering 0.5
volts or more, or directly fiom a Mclntosh'Audio Compensator or Pre-Amplifier. ^Output impedances of 4,
8 and 16 ohms are provided for direct connection to loudspeakers. An additional 600 ohm output is present
for use with lines, etc.
INSTALLATION
Location
The MC-60 should be located in a well-ventilated area. If the amplifier is housed in a cabinet or other
enclosure, holes must be provided for air circulation.
Input Connections
1. When a Mclntosh Audio Compensator or Pre-Amplifier of the non-self Powered type is used w_ith^the
MC-60, plug the pre-amplifier's output-power cord into the "PRE-AMP INPUT" receptacle on the Y9.60
and tu;; th; "GAiN" control fully -counter clockwise. This receptacle supplies the required- plate and fila-
ment power to the pre-amplifier equipment as well as providing the necessary audio connections.
For pre-amplifier installation, adjustment and operation refer to the pre-amplifier's instruction manual.
2. When using a self-powered Mclntosh Audio Compensator or Pre--Amplifier, connect th_e-audi: outPut
from the pr"-u*piifi.r to ihe iqpu-t qf the MC-60 using the cable supplied with the pre-amplifier. Turn the
"GAIN" Control fully counter clockwise.
3. When a signal source of 0.5 volts or more is used to drive_Lh"__V-C-Q9, 1uc!r a1 the output of a tuner,
tape recorder, or-other pre-amplifiers, plug the source into the "0.5 VOLT" pin jack receptacle.or connect
to'the "0.5 V'OLT" and'"GND'screw-terminals. Use the "GAIN" control to obtain the desired operating
level.If desired, the signal source may be wired to an octal plug for insertion in the octal__"Pre-Amp.Input"
receptacle. In ihis casi connect the iriput lead to pin S5 and the ground lead to pin #1. When using this con-
nection the source must not have a DC output comPonent.
Output Connections
The MC-60 has output impedances of 4, 8 and l6,ohms_available at either the screw terminal connector
or the output socket. In iddition, a 600 ohm output (balanced to ground) is available at the output socket.
See schemltic diagram for socket connections.
' It is important that the loudspeaker or other load be properly- matched to the amplifier. if best.p.erfo1m;
ance is to be obtlined. Because miny loudspeakers do not have voice coil impedanc-es exactly matching 4, I
and 16 ohms, the following table listi suggesied connections for best impedance matching.
Speaker Impedance
Connect to
3.2 to 6.5 ohms
4 ohms
6.5 to 13 ohms
B ohms
13 to 32 ohms
16 ohms
-4-

WARNING: Output plugs wired tor Mclntosh 20W-2 and 50W-2 amplifiers must not be used with the
MC-60 without rewiring the plug.
Output connections for the MC-30 are the same as those for the MC-60.
Power Connections
The MC-60 operates from any 110 to 130 volt 50-60 cycles power line. (When continuous use is con-
templated on 120 to 130 line volts the transformer primary should be re-connected using the 125 volt tap.)
When the MC-60 is used with Mclntosh Pre-Amplifier equipment, tuners, or other associated equipment,
the MC-60 power cord may be plugged into the receptacle at the rear of these units. When thus connected
the power switch of these units controls the MC-60.
GUARANTEE
We guarantee the performance of this equipment and the mechanical and electrical workmanship to be
free of serious defects for a period of 90 days. This guarantee does not extend to components damaged by
improper use nor does it extend to transportation to and from the factory.
SERVICE INFORMATION
All Mclntosh equipment is designed for long trouble free operation. All components are of the highest
quality and are conservatively operated. If trouble develops the amplifier may be serviced by your franchised
dealer, a competent serviceman, or returned to the factory. Equipment will not be accepted at the factory
unless factory return authorization is first received. The following chart of operating voltages and resistances
is offered as a guide for servicing the unit. All voltages and resistances are measured to chassis except
those with asterisk (*). These are measured to chassis with pin fi2 of either 5U4GA grounded. Voltages are
measured with high impedance VTVM. NOTE-UNIT MUST BB TURNED OFF WHEN MEASURING
RESISTANCES.
VOLTAGE AND RESISTANCE CHART
Tube
t2AX7
T2AU7
I2BH7
Pin No.
1
2
3
6
7
B
1
2
c,
J
6
7
B
1
2
3
6
7
B
DC Volts
No Signal
B2
0
1.1
360
108
111
284
82
92
28+
62 Approx.
92
340
0
16.5
340
0
16.5
DC Volts
at 60W out
B1
0
1.1
310
108
110
210
B1
BB
240
67 Approx.
BBI
285
0
15
285
0
15
AC Volts
at 60W out
1.5
,45
.45
Resistance
in Ohms
Unit Otr
Inf .
100K to 560K
3.3K
1OKx
1.2MrT
Inf.
40K*
Inf .
lBK
3BK+T
Inf .
1BK
12K*
210K
1.2K
12Kr$
210K
1.2K
0
0
0
B,+
1.5
.5
B.+
0.5
1.+B
1 1.6
.52
148
Lt.2
.52
-5-

L5.
4<
t--, ^N 1....,
,?'rr
?t)
{h/
/ /' 0 .*--'{
\f
47,
Y-'
Ttrbe
12AX7
6550
(Both
Tubes)
5U4GA
(Both
Tubes)
Pre-Amp
Input Socket
Pins not listed
Pin No.
1
,
-
c)
J
6
7
B
o
J
4
5
B
2
4
6
B
4
5
DC Volts
No Signal
430
-45
-45
130
-45
-45
430
430
-+5.B
435
0
0
435
425
0
DC Volts
at 60W ottt
365
-4+
_45
365
-44
-45
365
360
-+5
-2.5
380
0
0
380
365
0
AC Volts
at 60W out
106
148
t48
106
T48
148
106
110
tlB
110
9,4
335
335
6.4
0.36
Itesistance
in Ohms
Unit Otr
45x
1M
140K
45x
1M
140K
45*
2500rT
l40K
6
0rs
t+
15
0rT
10K*
320K
are either filaments, have no voltage or are not used.
U. S. Patents No. 2,+77,07 4; 2,545,788 ; 2,646,467 ; 2,654,058 others pending
McINTOSH LABORATORY, INC.
2 Chambers Street
Binghamton, N. Y., U.S.A.
In Can ada: Manufactured Under License by McCurdy Radio Industries, Ltd.
22 Front Street West, Toronto, Canada
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