McIntosh C20 Owner's Manual page 10

CONNECTION
TAPE COMPARE
AUX
TAPE
TUNER 1 &
TUNER 2
CONNECTION
TAPE HEAD 1 & 2
2-10 MV
TAPE HEAD 1 & 2
10-70 MV
PHONO 1 & 2
XTAL
CERAMIC
PHONO 1 & 2
MAGNETIC
2-10 MV
PHONO 1 & 2
MAGNETIC
10-70 MV
If a cartridge requires less than 47,000 ohms
load impedance, a resistor can be added across the
8
Table 1. High-Level Input Connections
FUNCTION
The tape compare input accepts a signal
from a tape recorder with a monitor head
and pre-amplifier.
The auxiliary input accepts any auxiliary
service requiring flat frequency response,
such as a T.V. set, tuner, tape recorder
with its own playback pre-amplifier, etc.
The tape input operates with tape machines
containing their own playback pre-ampli-
fier.
The tuner inputs accept AM and FM outputs
from a stereo tuner or a pair of stereo
tuners.
Table 2. Low-Level Input Connections
FUNCTION
These jacks are to be used with a tape deck
or a pair of tape decks that do not con-
tain their own playback pre-amplifiers and
have an output of less than 10 MV.
These jacks are to be used with a tape deck
or a pair of tape decks that do not con-
tain their own playback pre-amplifiers and
have an output of more than 10 MV.
These jacks are to be used with a constant
amplitude cartridge such as a crystal,
ceramic, or frequency-modulated device.
These jacks are to be used with magnetic
cartridges having an output less than
10 MV.
These jacks are to be used with magnetic
cartridges having a relatively high output.
Maximum input voltage for this input is
70 MV.
Desired Impedance
47,000 ohms (47K)
37,000 ohms (37K)
27,000 ohms (27K)
15,000 ohms (15K)
6,800 ohms (6.8K)
INPUT
SENSITIVITY
0.25V
0.25V
0.25V
0.25V
SENSITIVITY
2 MV
10 MV
0.1 V
2 MV
10 MV
terminals of the cartridge to achieve the correct ter-
mination. The following chart may be used as a guide:
Resistor Across Input
No Resistor
180,000 ohms (180K)
62,000 ohms (62K)
22,000 ohms (22K)
8,200 ohms (8.2K)
INPUT
IMPEDANCE
115K
470K
470K
470K
IMPEDANCE
47K
267K
220 mmf
in series
with 47K
47K
47K