McIntosh C20 Instruction Manual page 10
Stereo compensators
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Also See for C20:
- Owner's manual (20 pages) ,
- Instruction manual (11 pages) ,
- Maintenance manual (6 pages)
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pHoNo
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J-TApE
XTAL
MAGNEIIC
.
XTAL
MAGNFTrc
CERAMIC
2-lOr'rv
lO'7Omv
CERAl,llC
2-l0uv
lo-7omv 2-'l0nv
The
fir
s
t
group
is rrlarked
'r
XTAL-
CERAMIC
I
and
ie to
be
us
e
d with a
c
ons
tant arnplitude
c
ar
-
tridge such as a
cr
ystal, ceramic, or
frequency
rnodulated
device. The imput sensitivity for full
output
is
0.
I volt.
The
input
te
rrnination
is a
?,20
rnrnf
capacitor in series with
47, 000
ohms.
This
arrangernent allows
the record
corrrpensator
switche
s to be
used
with
the
se
type
s of cartridge
s
.
The
second
group
is rnarked 'ilow' '
or"Z
to l0
MV'f
and
is
de
signed
to be
us
ed
with
rnagnetic
car
-
tridge
s having an
output
of
le
s
s than
I
0
MV.
The
input
s
ens
itivity
f
or
f
ull output
i
s
Z
MV. The in-
put
impedance
is
47,000
ohrns.
The
third group is rnarked "High'r or
'f
I0 to
70
MV" to be
us
ed with rnagnetic cartridge s
having
relatively high output. The input sensitivity for
f
ull output is l0 MV. Maximurn
inpr"t
voltage for
this input is
7
0 MV.
The input impedance
is
47
,
00
0
ohrns
.
If a cartridge reguires other than
47,000
ohrns
load irnpedance, a
re
sistance can be
added
acros
s the terrninals of the cartridge to
achieve
the correct terrnination.
The
following chart
rnay
be
used
as
a
guide:
Desired
Irnpedance:
47,000 ohrns
(47K1
37,000
ohrns
(37K)
?,7
,000
ohrns (Z7Kl
I
5,000
ohms
(
I
5K)
6,800 ohrns (6.8K)
Resistor Across
Input:
No Resistor
180,000
ohrns (I80K)
62, 000
ohrns
(62K1
ZZ,00O
ohrns
(ZZKI
8,200 ohms
(8.2K)
Each
phono
input has been arranged to
play
either stereo or rrronophonic. In the
rnonophonic
position
of
the input
selector switch
the
two
channels
of a stereo
cartridge are in paralleI
to
cancel
all vertical output. Vertical
output
results in
objectionable noise
generated
when
play-
ing a
rnonophonic
recording with a stereo cartridge.
If
both
a 6tereo
and
a
monophonic
cartridge are to be
used
in the system, the stereo car-
tridge can be
plugged
into Phono 1 and the
rnonophonic
cartridge into
Phono
2, either left
'or right channel.
When
listening to
the monophonic
cartridge turn the selector switchto
Phono
2M
to reproduce the prograrn frorn both speakers.
Not
that the
sarne
effect could
be
achieved
by switching
the rnode
selector to M left or M right
depending
on
the
channel
used.
-9-
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