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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-
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