Pin 2
Pin 1
Pin 3

Introduction and Performance Features

Important Information

1.Caution: To prevent electrical shock make sure that the AC POWER CORD IS NOT CONNECTED TO THE MC275 when inserting or removing Vacuum Tubes, as there are hazardous voltages present at the pins of the Tube Sockets.

2.When Vacuum Tubes are installed or removed make sure to reattach the Tube Cover to the MC275 Chassis.

3.If the MC275 has been On, please allow the Hot Vacuum Tubes to cool first before removing them.

4.For additional connection information, refer to the owner’s manual(s) for any component(s) connected to the MC275.

5.It is very important that loudspeaker cables of adequate size be used, so that there will be minimum power loss. The size is specified in Gauge Numbers or AWG (American Wire Gauge). The smaller the Gauge number, the larger the wire size.

Connection Terminals will accept up to a 8 AWG wire size: If your loudspeaker cables are 50 feet (38.1m) or less, use at least 14 Gauge.

If your loudspeaker cables are 100 feet (76.2m) or less, use at least 12 Gauge.

Connector Information

XLR Connectors

Below is the Pin configuration for the XLR Balanced Input Connectors on the MC275. Refer to the diagram for con- nection:

PIN 1: Shield/Ground

PIN 2: + Input

PIN 3: - Input

Introduction

Now you can take advantage of traditional McIntosh stan- dards of excellence in the MC275 Stereo Power Amplifier. Two 75 watt output channels will drive any high quality Loudspeaker System to its ultimate performance. The MC275 reproduction is sonically transparent and abso- lutely accurate. The McIntosh Sound is “The Sound of the Music Itself.”

Performance Features

•Power Output

The MC275 consists of two separate power amplifier chan- nels, each capable of 75 watts into 4, 8 or 16 ohm Loud- speakers in stereo. It may also be operated in mono at 150 watts into 2, 4, or 8 ohm Loudspeakers.

•Bifilar Wound Transformers and Output Circuit The Power Output Sections utilize the famous McIntosh Patented Unity Coupled Circuit with a Bifilar Wound Out- put Transformer for low distortion, extended frequency re- sponse and cool operating output tubes.

•Balanced and Unbalanced Inputs

Balanced connections guard against induced noise and al- low long cable runs without compromising sound quality.

•Gold Plated Connectors and Tube Socket Contacts Gold Plated Input Jacks and Output Binding Posts provide trouble free connections. Ceramic tube sockets with gold plated contacts provide protection from atmospheric con- tamination. Output Tube Sockets include Air-Pipe cooling at their bases.

•Super Mirror Chassis Finish

The famous McIntosh Stainless Steel Chassis with Super Mirror Finish ensures the pristine beauty of the MC275 will be retained for many years.

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McIntosh MC275 owner manual Introduction and Performance Features Important Information, Connector Information
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MC275 specifications

The McIntosh MC275 is a legendary vacuum tube amplifier that has maintained its reputation for delivering exceptional sound quality since its introduction in the 1960s. This iconic amplifier represents the pinnacle of audio engineering, combining vintage aesthetics with modern technologies to cater to discerning audiophiles.

At the heart of the MC275 lies its push-pull quad output configuration, powered by a pair of KT88 vacuum tubes that produce up to 75 watts per channel. This setup is renowned for its ability to provide a rich, warm sound with an impressive dynamic range. The combination of vacuum tube warmth and solid-state precision results in an audio experience that is both engaging and detailed, making it suitable for a wide array of musical genres.

One of the standout features of the MC275 is its unique quad-balanced design. This architecture minimizes distortion and maximizes clarity, allowing the amplifier to engage with the very essence of the audio signal. The implementation of a high-fidelity transformer enhances the low-frequency response, ensuring that bass notes are robust yet controlled.

The MC275 also showcases McIntosh's innovative Autoformer technology. This proprietary feature allows the amplifier to deliver the full rated power into 2, 4, or 8-ohm speakers without compromising audio quality. This versatility ensures compatibility with a wide range of loudspeakers, making it a perfect choice for both small setups and larger audio systems.

Additionally, the MC275 is equipped with McIntosh's signature Power Guard circuitry, which prevents clipping and distortion by monitoring the output signal in real-time. This feature safeguards both the amplifier and connected speakers, ensuring that listeners can enjoy loud volumes without concern for damaging equipment.

The amplifier's stunning design includes a striking illuminated analog meter, providing visual feedback on output levels. The classic black glass front and chrome chassis not only exude elegance but also emphasize McIntosh's rich heritage in high-fidelity audio.

In conclusion, the McIntosh MC275 is a remarkable fusion of classic and modern technology, offering audiophiles a powerful and aesthetically pleasing amplification option. With its impressive power output, advanced technology, and iconic design, the MC275 continues to be a sought-after choice for those who appreciate the art of sound.
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