McIntosh MR 74, Owner'S Manual, Page: 4 / 20

It is recommended that the MR 74 tuner be mount-
ed in a normal or horizontal position. However, with
adequate ventilation the tuner can be mounted in
any position.
Adequate ventilation extends the trouble-free life
of electronic instruments. It is generally found that
each 18° F rise in operating temperature reduces the
life of electrical insulation by one half. Adequate
ventilation is an inexpensive and effective means of
preventing insulation breakdown that results from
unnecessarily high operating temperatures. The
direct benefits of adequate ventilation is longer,
trouble-free life.
The MR 74 tuner requires a mounting space that is
at least 15 inches deep, 17½ inches wide and 6
inches high. Provide additional space for the air flow
across the bottom of the tuner and a means for warm
air to escape at the top.
Remove the tuner, shelf brackets, parts bag and
mounting template from the carton. Remove tuner
from the plastic bag and place the tuner upside
down on the shipping pallet, then remove the four
plastic feet fastened to the bottom of the chassis.
The installation may be accomplished in six steps:
1. POSITION TEMPLATE AND MARK
Position the plastic mounting template over the
area of the cabinet panel where the MR 74 is to
installed. Be sure that the edges of the template
clear any shelves, partitions or existing equip-
ment located behind the panel. With the tem-
plate in place mark the six " A " and " B " holes
and four small holes locating the corners of the
cutout. Next, join the four corner marks with
pencil lines; the edge of the template may be
used as a straight edge.
2. DRILL HOLES
Holding a drill perpendicularly to the panel, drill
the six " A " and " B " holes using a 3/16 inch drill.
THE SIX HOLES MUST BE DRILLED BEFORE
MAKING THE CUTOUT.
3. SAW CUTOUT
Using a saw carefully cut the rectangular open-
ing on the inside of the pencil lines.
4. SECURE MOUNTING STRIPS
Secure mounting strips (supplied in the hard-
ware package) on the inside of the cabinet
panel.
Insert two screws (supplied in the hardware
package) into the center holes ("B" holes on the
template). Use the ¾-inch long screws for
panels under ½-inch thick or 1¼-inch screws
for panels ½-inch thick or over. Place a mount-
ing strip on the back of the cabinet pane! as
shown. Align it with the three holes in the panel
and tighten the screw. The screw head should
pull slightly into the wood panel. Attach the other
mounting strip by repeating the procedure.
5. MOUNT PANLOC SHELF BRACKETS
Attach the Panloc shelf brackets to the cabinet
panel using four screws of the proper length.
Place the template over the mounting screws.
The screws should be centered on the "A" and
" B " holes in the template. If necessary, loosen
the screws and push the mounting brackets into
alignment then retighten.
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