McIntosh MR 74, Owner'S Manual, Page: 6 / 20

How to Connect
AUDIO OUTPUTS
Use the FIXED OUTPUT jacks to connect to a stereo
control preamplifier or other equipment which has
its own volume control. The VOLUME CONTROL
does not affect the output of the tuner at the FIXED
OUTPUT jacks.
The output impedance at the FIXED OUTPUTS is
600 ohms. Longer cables than are normally supplied
can be used to interconnect the MR 74 with other
equipment. The length of the cable is limited by the
capacity of the cable. The total capacity must not
exceed 1600 pF. For instance: cables with a capacity
of 32 pF per foot may be 50 feet long; 16 pF per foot
cable may be 100 feet long.
Use the FRONT PANEL CONTROLLED jacks to
connect to equipment such as power amplifiers or
tape recorders where control of volume at the tuner
is desired. The load impedance connected to FRONT
PANEL CONTROLLED jacks should not be less than
10,000 ohms. There is no difference in the signal
quality or maximum output levels available at either
pair of output jacks.
CONNECTING AN FM ANTENNA
One of three antenna systems can be used: (1) an
outdoor FM antenna, (2) an all channel (UHF-VHF-
TV) antenna, or (3) the indoor dipole supplied with
the MR 74.
An outdoor antenna is recommended for optimum
performance in all areas. In fringe areas, best re-
sults will be obtained with a highly directional FM
antenna used in conjunction with a rotator. Rotate
the antenna until the best reception is obtained. Con-
nect the 300 ohm antenna to the 300 ANT (red)
terminals.
An UHF-VHF-TV antenna is often effective but the
antenna must be designed for both FM and TV re-
ception. Connect the leads from the UHF-VHF-TV
antenna to the 300 ANT (red) terminals.
CONNECTING AN INDOOR DIPOLE ANTENNA
The flexible folded dipole antenna (300 ohm) is for
use in urban or high strength signal areas.
Connect the two leads from the dipole to the 300
ANT (red) terminals. The flexibility of the thin flat
wire assembly permits it to be placed under a rug,
tacked behind the stereo . . . or, placed in any other
convenient location. In some cases, it may be nec-
essary to "position" the antenna for best signal re-
ception. This should be done before it is permanently
located. Avoid locating this antenna next to other
wires or metal objects. This antenna may not prove
effective in houses having metal siding or metal-clad
insulation.
AM ANTENNA
A high-quality loop-stick antenna is provided. It
can be rotated through nearly 180° in all directions
for maximum performance, optimum signal reception
or minimum interference. With this mobility you will
not suffer loss of sensitivity regardless of the angle
at which the instrument is mounted. A back panel
antenna jack is provided for connecting an external
antenna if desired.
4
For best long distance AM reception, use a copper
antenna wire 50 to 150 feet in length. Suspend the
wire in a straight line as high as possible. Attach the
wire at each end with suitable glass or ceramic in-
sulators. Connect a lead-in wire at any convenient
point on the antenna. It is recommended that a light-
ning arrester be used with an outdoor AM antenna.
The arrester should be well grounded to a suitable
water pipe or a ground rod sunk into the ground.
Connect the lead-in wire to the AM ANT push con-
nector on the antenna terminal strip on the back
panel. Set the AM ANT slide switch to EXT position.
CONNECTING AN AM OUTDOOR ANTENNA