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
•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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