Figure 18
Input Test Signal
Figure 17

The special Balanced Winding Autoformer creates an ideal match between the power amplifier output stage and the loudspeaker. A McIntosh amplifier with an Autoformer can be used to safely drive multiple speakers without re- ducing the life expectancy of the power amplifier. Refer to figure 15.

Figure 15

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 your valuable loudspeakers. The unequaled expertise of McIntosh in the design and manu- facturing of Autoformers is legendary in the high fidelity industry. McIntosh engineers know how to do it right.

Power Output Meter

The McIntosh MC501 has a Output Watt Meter that re- sponds 95% full scale to a single cycle tone burst at 2kHz. Refer to figure 16. Voltage and current output are electroni- cally 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.

Figure 16

Protection Circuits

The MC501 incorporates a version of the McIntosh Sentry Monitor Output Transistor Protection Circuit. Refer to Fig- ure 17. There is absolutely no compromise in sonic perfor- mance with this

circuit, and it en- sures safe opera- tion of the ampli- fier under even the most extreme oper-

ating conditions. The different types

of protection cir- cuits incorporated

in the MC501 in- sure a long and

safe operating life. This is just one of

the many characteristics of McIntosh Power Amplifiers that make them world famous.

The MC501 also includes the unique patented McIntosh Power Guard circuit.

Power Guard eliminates the possibility of ever overdriving the amplifier into clipping. Refer to figures 18, 19 and 20. An overdriven amplifier can produce both audible and inaudible distortion levels exceeding 40%. The au- dible distortion is un- pleasant to hear, but the inaudible ultrasonic dis- tortion is also undesir-

14

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McIntosh MC501 owner manual
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MC501 specifications

The McIntosh MC501 is a high-performance monaural amplifier that exemplifies the blend of cutting-edge technology and exquisite craftsmanship inherent in McIntosh products. Renowned for its exceptional audio performance, the MC501 is designed to deliver powerful and precise sound reproduction, making it a prized component in any audiophile's collection.

One of the standout features of the MC501 is its output power, providing a robust 500 watts into 2, 4, or 8-ohm loads. This level of power ensures that the amplifier can drive even the most demanding speakers with ease, producing dynamic sound across various listening environments. The MC501 features a unique autoformers design, allowing it to maintain consistent impedance, which results in superior sound clarity and dynamics regardless of speaker type.

The technological advancements in the MC501 include McIntosh's iconic Power Guard circuit. This system monitors the audio signal and automatically reduces the amplifier's output if it detects any distortion, protecting both the amp and the connected speakers from damage. Additionally, the amplifier incorporates McIntosh's Sentry Biasing technology, which ensures optimal performance while preventing overheating, making it a reliable choice for extended listening sessions.

Aesthetically, the MC501 is as impressive as it is functional. It showcases the brand's signature blue watt meters and backlit logo, which not only enhance its visual appeal but also provide real-time feedback on power output levels. Its solid construction and elegant design make the MC501 a striking addition to any audio setup, embodying a luxurious look that is synonymous with McIntosh.

Moreover, the MC501 is engineered with a balanced design, featuring both balanced and unbalanced inputs to ensure compatibility with various audio sources. This flexibility allows users to integrate the amplifier seamlessly into their existing audio systems while maintaining the highest sound quality.

In summary, the McIntosh MC501 monaural amplifier delivers exceptional power, advanced technologies, and unrivaled sound quality. Its robust output capabilities, protective features, and stunning design make it a cornerstone of any high-end audio system, appealing to both seasoned audiophiles and newcomers looking to elevate their listening experience. With the MC501, McIntosh continues to uphold its legacy of excellence in the world of high-fidelity audio.
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