McIntosh MC275 - Manual (Page 4)

4
Performance Features
Introduction and Performance Features
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.”
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.
•••••
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.
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
Connector Information
Pin 1
Pin 2
Pin 3