McIntosh C20 - Guarantee............................ O... O. R O

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-