Bruksanvisning McIntosh MC-250 Förstärkare

Bruksanvisning

Installation

Adequate ventilation extends the trouble-

free life of electrical instruments. It is gen-

erally found that each 10° centigrade (18° F)

rise in temperature reduces the life of elec-

trical insulation by one half. Adequate ven-

tilation is an inexpensive and effective means

of preventing insulation breakdown that re-

sults from unnecessarily high operating tem-

peratures. The direct benefit of adequate

ventilation is longer, trouble-free life.

The suggested minimum space for mount-

ing the MC 250 is 18 inches long X 8 inches

wide X 11½ inches high. Always allow for air

flow by either ventilation holes or space next

to the bottom of the amplifier and a means

for the warm air to escape at the top.

It is recommended that the MC 250 be

mounted in a normal or horizontal position.

However with adequate ventilation, the ampli-

fier can be mounted in any position except

upside down. If the amplifier is to be installed

on a vertical surface it is recommended that

the autoformers be on the down side. This

position permit greater air flow around the

transistors and component parts thereby ex-

tending the trouble-free life of the amplifier.

HOW to Connect

INPUT—STEREO

The shielded cable from the left output of the Mc-

lntosh preamplifier is plugged into the left jack. The

shielded cable from the right output of the Mclntosh

preamplifier is plugged into the right jack. The INPUT

switch must be in the STEREO position and the OUT-

PUT properly connected to the stereo loudspeakers

or distortion and loss of power may result.

INPUT—MONO

The shielded cable from the program source is

plugged into the right jack. The INPUT switch must

be in the MONO position and the OUTPUT properly

connected for mono loudspeaker operation or dis-

tortion and loss of power may result.

INPUT—STEREO OR TWIN AMPLIFIERS

For stereo or twin channel operation it is not neces-

sary to use the same impedance loudspeaker on

each output. Simply connect each channel for the

impedance desired.

SPEAKERS

Speakers are connected at the barrier strips

marked OUTPUT on the sloped panel of the amplifier.

Use lamp cord, bell wire, or wire with similar type

of insulation to connect the speakers to the amplifier.

For the normally short distances of under 50 feet be-

tween the amplifier and speaker, #18 wire or larger

can be used. For distances over 50 feet between the

amplifier and speaker use larger wire.

The loudspeaker impedance is usually identified

on the loudspeaker itself. Connect one of the leads

from the left loudspeaker to the screw marked COM

on the LEFT OUTPUT barrier strip. Connect the other

lead from the left loudspeaker to the screw marked

with the number corresponding to the speaker imped-

ance on the LEFT OUTPUT barrier strip. Connect one

of the leads from the right loudspeaker to the screw

marked COM on the RIGHT OUTPUT barrier strip.

Connect the other lead from the right loudspeaker

to the screw marked with the number corresponding

to the speaker impedance on the RIGHT OUTPUT

barrier strip.

The only adverse effect on the operation of a Mc-

lntosh amplifier when it is improperly matched is a

reduction in the amount of distortion-free power

available to the loudspeaker. Close impedance

matching is desirable for maximum distortion-free

power.

SPEAKER CONNECTIONS

Use this table to determine proper speaker con-

nection:

Connect the

speaker leads

between COM and:

4 ohms

8 ohms

16 ohms

If the speaker impedance

is between:

3.2 to 6.5 ohms

6.5 to 13 ohms

13 to 26 ohms

STEREO OUTPUT—CONNECTING TO

BARRIER STRIPS

Use this table for stereo connections using the

barrier strips:

If the speaker

impedance is:

4 ohms

8 ohms

16 ohms

Connect one left

speaker to

screw

LEFT-COM and

other to:

LEFT-4

LEFT-8

LEFT-16

Connect one

right speaker

lead to the

screw marked

RIGHT-COM and

the other to:

RIGHT-4

RIGHT-8

RIGHT-16

For 25 volt line operation connect one of the left

leads to the screw marked COM on the LEFT OUT-

PUT barrier strip. The other left lead is connected

to the screw marked 16 on the LEFT OUTPUT barrier

2

Betyg

Mer om denna bruksanvisning

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