McIntosh MCC602TM Manuel du propriétaire télécharger pdf (Page 15)

Technical Description

McIntosh Laboratory, the company who introduced the

worlds first amplifier over fifty years ago that could be

called High Fidelity, has done it again. The McIntosh

engineering staff has created a power amplifier without

compromise, using the most advanced McIntosh circuit

design concepts.

A continuous average power output rating of 300 watts

and with an output current of greater than 50 amperes per

channel, makes this not only the most advanced, but also

the most powerful amplifier McIntosh has ever manufac-

tured. The distortion limits for the MCC602TM are no

more than 0.005% at rated power output for all frequen-

cies from 20Hz to 20,000Hz. Typical performance at mid

frequencies is less than 0.002%. The true distortion read-

ings on the MCC602TM are so low, it takes special mea-

suring techniques to make accurate readings. The

MCC602TM can deliver the best possible performance

from any type of high quality loudspeaker system.

Creating an amplifier with this level of performance

did not come easily. Many months of design, testing and

measuring were required. Extensive controlled listening

tests, the ultimate form of measuring, were made before

the final design was accepted.

Design Philosophy

The design philosophy incorporated in the MCC602TM

involved several different techniques, all based on sound

scientific logic. Every stage of voltage or current amplifi-

cation must be as linear as possible prior to the use of

negative feedback. McIntosh engineers know how to prop-

erly design negative feedback circuits so they contribute to

Technical Description

Inside the MCC602TM

the extremely low distortion performance expected from a

McIntosh amplifier. The typical McIntosh owner would

never accept the approximately 100 times higher distortion

of many non-feedback designs.

Double Balanced Push Pull design is used from input to

output. Each half of the amplifier contains complimentary

balanced circuitry. The resulting double balanced configu-

ration cancels even order distortion. Refer to figure 11 on

page 18.

All transistors are selected to have nearly constant cur-

rent gain over the entire current range they must cover.

Output transistors in particular, have matched uniform cur-

rent gain, high current-bandwidth product and large active

region safe operating area. An automatic tracking bias sys-

tem completely eliminates any trace of crossover distor-

tion. All the resistors are Precision Metal Film types and

low dielectric absorption film capacitors are used in all

critical circuit locations.

The output signals of the two balanced circuits are

coupled together in the unique McIntosh MCC602TM Out-

put Autoformer. It provides low distortion power transfer at

frequencies from below 20Hz to well beyond 20,000Hz

with optimum impedance points of two ohms, four ohms

and eight ohms. The unequaled expertise of McIntosh in

the design and manufacturing of autoformers is legendary

in the high fidelity industry.

The high efficiency circuit design of the MCC602TM

contributes to low operating temperatures. McIntosh ampli-

fiers are constructed in an extruded aluminum tunnel that

has exhaust ports along its length. These exhaust ports are

tuned to provide even air flow, over the surface of the tun-

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McIntosh MCC602TM Manuel du propriétaire Page 15

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