Guarantee . . . . . . . . . . . . . . . . . . . . . . . . . . . . O . . . O . R O - McIntosh C20 Instruction Manual

GUARANTEE
We guarantee the performance of this
equiprnent and
the rnechanical and
electrical work-
rnanship to
be
free of defects for
a
period of
90
days. This guarantee does not extend
to
corn-
ponents
darnaged by
irnproper
use
nor
does
it
extend
to transporataion to
and
frorn
the
factory.
SERVICE INFORMATION
AlI Mclntosh equiprnent is
designed
for
long
trouble free operation,
A11
cornponents are
of the highest quality and are conservatlvely operated. If trouble
develops the
pre-amplifler
rnay be serviced by your franchlsed dealer, a
competent
serviceman' or returned to
the
fac-
tory. Equlprnent
wlll 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.
A11
voltages
and
resistances are rneasured
to chassis
excePt those
with as-
terisk
(:11
.
These
are rneasured to chagsis with pin #7 of
the
6X4 grounded. Voltages
are
rneasured
with high
irnpedance VTVM. NOTE
- IINIT MUST BE TURNED OFF
WHEN
MEA-
SURING
RESISTANCES. Controls
are positioned
as
follows for
rneasurernents.
C
ontr.ol
Mode
Balance
Phase
H.
F. fllter
Aural
cornp.
Input
s
e1e
ctor
Bas
s
cornp.
Pos
itions
Ste
re
o
0
0
Flat
Norrnal
Tape Head
2
0
C
ontr ol
T
reble
corrrp.
Bas
s
T
reble
Volurne
R
urnble
filte r,
tape
,
jack, tape
compare
L.O, Frequency Trirn
rg::Li"l:
tape
0
0
Max.
C,
W.
Out
0
Tube
DC
VOLTAGES
Pin I
Pin 2 Pin 3 Pin 4 Pin 5 Pin
6
Pin 7 Pin 8 Pin
9
V
I,
LZAXT
vz,
LzAxT
V3,
IZAUT
V4,
IZAUT
v5,
rzAxT
v
6,
LaAlr.7
v7,
LZAIKT
v8,
6x4
130
130
65
65
90
r00
250
3IO
AC
I9
L9
I9
I.0
1.0
2.5
2.5
0.8
0.8
65
6.7
AC
-6
-6
-6
-6
-6
-6
-6
100
100
195
195
230
200
250
60
60
z3
1.0
I.0
tl3
1r3
zg
z4
b5
3r0
Ac
330
-?L-