McIntosh MC-2kw Manuel d'utilisateur télécharger pdf (Page 20)

Autoformer

All solid state power amplifier output circuits work best

into what is called an optimum load. This optimum load

may vary considerably from what a loudspeaker requires. In

the case of more than one loudspeaker connected in parallel,

the load to the power amplifier may drop to two ohms or

even less. A power amplifier connected to a load that is

lower than optimum, causes more output current to flow,

which results in extra heat being generated in the power out-

put stage. This increase in temperature will result in a re-

duced life expectancy for the amplifier.

The special Balanced Dual “C” Core Autoformer creates

an ideal match between the power amplifier output stage

and the loudspeaker. Refer to figure 20. A McIntosh ampli-

fier with an Autoformer can be used to safely drive multiple

speakers without reducing the life expectancy of the power

amplifier.

There is absolutely no performance limitation with an

Autoformer. Its frequency response exceeds that of the out-

put circuit itself, and extends well beyond the audible range.

Its distortion level is so low it is virtually impossible to

measure.

In the rare event of a power amplifier output circuit fail-

ure, the McIntosh Autoformer provides absolute protection

from possible damage to valuable loudspeakers. The un-

equaled expertise of McIntosh in the design and manufac-

turing of Autoformers is legendary in the high fidelity indus-

try. McIntosh Engineers know how to do it right.

Power Output Meter

The McIntosh MC2KW Power Amplifier has a huge hand

built Output Watt Meter that responds 95% full scale to a

single cycle tone burst at 2kHz. Refer to figure 21. Voltage

and current output are electronically measured, multiplied

and fed to a special circuit that accelerates the pointer

movement in the upward direction. When the pointer

reaches its peak it pauses only long enough for the human

eye to perceive its position, then drops. It is almost 10 times

faster than a professional VU meter.

A front panel switch is provided to change the meter to

the Watts Hold Mode of operation. This allows fast upward

movement of the pointer but greatly increases Hold Time at

the peak of its travel. The highest power output of the

source material is thus recorded.

Protection Circuits

The MC2KW Power Amplifier incorporates the McIntosh

Sentry Monitor Output Transistor Protection Circuit. Refer

to Figure 22.

There is abso-

lutely no com-

promise in sonic

performance

with this circuit,

and it ensures

safe operation of

the amplifier un-

der even the

most extreme

operating condi-

Figure 20

Figure 21

Figure 22

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McIntosh MC-2kw Manuel d'utilisateur Page 20

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