Technical Description

Design Philosophy

The design philosophy incorporated in the MC1201 in- volved several different techniques, all based on sound sci- entific logic. Every stage of voltage or current amplifica- tion must be as linear as possible prior to the use of nega- tive feedback. McIntosh engineers know how to properly design negative feedback circuits so they contribute to 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 12.

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. Precision metal film resistors and low dielectric ab- sorption film capacitors are used in all critical circuit loca- tions.

The output signals of the two balanced circuits are coupled together in the unique McIntosh MC1201 Output 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 MC1201 con- tributes to low operating temperatures. More than 290 square inches of heat sink area keep the MC1201 operating safely with convection cooling. No fans are needed.

Autoformers

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 par- allel, 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 output stage. This increase in temperature will result in a reduced life expectancy for the amplifier.

Block Diagram

of the

Amplifier and Meter Circuitry

Figure 12

13

Page 12 Page 14
Page 13
Image 13
McIntosh MC1201 manual Design Philosophy, Autoformers
Page 12 Page 14

MC1201 specifications

The McIntosh MC1201 is a high-performance monaural amplifier that exemplifies the brand’s commitment to delivering exceptional audio quality and performance. Known for its robust build and advanced technology, the MC1201 is designed to impress audiophiles and music professionals alike.

At the core of the MC1201 is a power output of 1,200 watts, allowing it to effortlessly drive even the most demanding speakers. The amplifier features McIntosh’s renowned Autoformer technology, which ensures that the full power is available regardless of the speaker's impedance. This technology helps in maintaining sound quality and performance across various load conditions, making the MC1201 versatile for different audio setups.

One of the standout characteristics of the MC1201 is its unique Circuit Design, including the use of McIntosh's exclusive Power Guard system. This innovative technology monitors the output to prevent distortion, safeguarding both the amplifier and connected speakers from damage during high-volume playback. This feature is especially beneficial for those who push their audio systems to the limits, providing peace of mind without sacrificing sound quality.

The MC1201 also incorporates the company’s proprietary Sentry Monitor, a protection circuit that ensures the amplifier operates safely under all conditions. If the output current exceeds safe levels, the Sentry Monitor will engage and temporarily reduce power output, allowing the amplifier to cool down and return to normal operation.

In addition to its powerful performance, the MC1201 boasts an aesthetically pleasing design. It features a sleek black glass front panel, illuminated meters that provide a visual representation of the audio output, and the iconic McIntosh logo, which signifies quality and luxury. The high-quality build ensures longevity and reliability, essential for both home audio enthusiasts and professional settings.

With its combination of power, advanced technology, and meticulous craftsmanship, the McIntosh MC1201 remains a sought-after choice for those seeking top-tier amplification solutions. Whether used in a home theater system or a high-fidelity audio setup, the MC1201 delivers an unparalleled listening experience, exemplifying McIntosh’s dedication to excellence in audio engineering.
Top Page Image Contents