Connecting; A-C Connections; Table Of Contents To Adjust For Balance In The Treble Range A-C Connections - McIntosh C20 Owner's Manual

follows: Locate the center of the shelf and scribe a
line from front to back. The "SHELF CUTOUT TEM-
PLATE" is marked for panel thicknesses from 1/4" to 1".
Fold the template on the line that corresponds to the
thickness of the panel. Place it on the shelf so that it
butts against the inside of the panel. Match the center
line mark on the template to the scribed center line on
the shelf. Mark the position of the four drill holes.
Drill the four 1/4" holes.
INSTALLING THE C20
Remove the four screws holding the C20 to the
shipping pallet. (Save these screws, you will need them
if your cabinet has a 1/4" or 3/8" shelf.) Remove the
four plastic feet from the bottom of the C20.
In the mounting hardware package are four 6-32
flathead screws and eight 6-32 roundhead screws. Two
of the flathead screws of the proper length are used to
attach the mounting strips to the cabinet. Four of the
roundhead screws of the proper length are used to
attach the C20 to the cabinet and mounting strips.
The 6-32 x 1/2" screws are to be used with panels
under 3/8" in thickness. The 6-32 x 1-1/4" screws are
to be used with panels 1/2" to 1" in thickness.
Select the proper length 6-32 flathead screws and
use them to install the two mounting strips behind the
front panel. Be sure that the edge of the strip with the
clips is toward the panel opening. Line up the mount-
ing strips on each side of the front panel cutout so the
three holes in the strip are in line with the three holes
in the panel. (See Figure 3.) Install the proper length
flathead screws in the center hole of each strip. Drive
them in so the flatheads are flush with the panel; if
necessary, countersink the two center holes.
Figure 3. Securing the Mounting Strip to the
Front Panel

A-C CONNECTIONS

There are five a-c receptacles in the lower left-
hand corner of the rear panel. (See Figure 5.) These
receptacles have a maximum rating of 600-watt total.
The four black receptacles are controlled by the OFF-
on switch on the VOLUME control. The red receptacle
6
Carefully insert the C20 through the front of the
panel opening so that it rests on the shelf. Insert the
proper length 6-32 roundhead screws into the four
holes in the mounting flanges on each end of the tuner
front panel. Drive them in, but do not tighten.
If the cabinet is fixed and will not be moved
about, it is not necessary to secure the C20 chassis to
the shelf. If the cabinet is to be moved about, it is
recommended that the C20 chassis be secured to the
shelf in the following manner. Tighten the four screws
holding the front panel. The four 10-32 x 1/2" screws
used in shipping are supplied for use if the shelf is
under 3/8". Use the 10-32 x 3/4" screws if the shelf is
1/2" or 5/8" and the 10-32 x 1" screws if the shelf
is 3/4" or 7/8". Secure the chassis with the proper
length 10-32 machine screws, inserting them from be-
neath the shelf. Do not tighten the 10-32 screws until
you have tightened the front panel screws.
Attach the two metal panel end caps (packed with
mounting hardware) on each end of the panel by sliding
onto the pins. (See Figure 4.) The end caps are held
by spring tension and can easily be removed if the
chassis is to be taken out of the cabinet.
Use of the wrong length 10-32 screws may
cause electrical shorting in the circuit.
Figure 4. Fitting of Panel End Caps to Panel
MOUNTING IN THE L-66 CABINET
The Mclntosh L-66 cabinet is supplied with com-
plete instructions and all necessary hardware for in-
stalling the C20. The dimensions of the L-66 are
16-9/16" wide by 6-11/16" high, including mounting
feet, by 13-3/4" deep, including the front panel and
control knobs.

CONNECTING

is not switched. The red receptacle is used for power-
ing a turntable or record changer. The receptacle is
not switched so that the turntable power will not be
turned off while the turntable idler wheel is engaged.
With this arrangement it is necessary to turn off the
turntable with its own control switch so that no damage
will result to the turntable drive system.