Connector Information; Introduction; Performance Features - McIntosh Power Amplifier MC303 Owner's Manual

General Information, con't
6. When discarding the unit, comply with local rules
or regulations. Batteries should never be thrown
away or incinerated but disposed of in accordance
with the local regulations concerning battery dis-
posal.
7. For additional information on the MC303 and other
McIntosh Products please vist the McIntosh Web
Site at www.mcintoshlabs.com.
8. When the MC303 is operated in the USA or Canada and the
main fuse, located on the rear panel, is in need of replace-
ment use only the following part:
Bussman ABC-15-R or Littlefuse 314-015P
Connector and Cable Information
XLR Connectors
Below is the Pin configuration for the XLR Balanced Input
Connectors on the MC303. Refer to the diagram for con-
nection:
PIN 1: Shield/Ground
PIN 2: + Output
PIN 3: - Output
Power Control Connector
The MC303's Power Control Inputs receive On/Off signals
of +5 volts. An additional connection
is for controlling the illumination of
the MC303 Power Output Meters.
The 1/8 inch stereo mini phone plug
connects to a McIntosh A/V Control
Center Power Control Output.
Note: The Power Control Connecting Cable is available from
the McIntosh Parts Department:
Data and Power Control Cable Part No. 170-202
Six foot, shielded 2 conductor, with 1/8 inch stereo mini
phone plugs on each end.

Introduction

Now you can take advantage of traditional McIntosh
standards of excellence in the MC303 Power Amplifier.
The 300 watt high current output per channel will drive
any high quality loudspeaker system to its ultimate per-
formance. The MC303 reproduction is sonically transpar-
ent and absolutely accurate. The McIntosh Sound is "The
Sound of the Music Itself."

Performance Features

• Power Output
The MC303 is a Power Amplifier with a capability of 300
watts per channel (all channels driven) into 2, 4 or 8 ohm
speakers with less than 0.005% distortion. The Power Am-
4
Connector Information, Introduction and Performance Features
PIN 2
PIN 1
PIN 3
Power
Control
Meter
Illumination
Control
Ground
plifier circuitry uses Thermal Trak
lower distortion and cool operation.
• Balanced and Unbalanced Inputs
Balanced connections guard against induced noise and al-
low long cable runs without compromising sound quality.
• Power Guard
The patented McIntosh Power Guard circuit prevents the
amplifier from being over driven into clipping, with its
harsh distorted sound that can also damage your valuable
loudspeakers.
• Sentry Monitor and Thermal Protection
McIntosh Sentry Monitor power output stage protection
circuits ensure the MC303 will have a long and trouble free
operating life. Built-in Thermal Protection Circuits guard
against overheating.
• Patented Autoformer
McIntosh designed and manufactured Output Autoformers
provide an ideal match between the amplifier output stages
and speaker loads of 2, 4 and 8 ohms. The Autoformers
also provide perfect DC protection for your valuable loud-
speakers.
• Special Power Supply
A regulated Power Supply, a very large Power Transformer
and Capacitors ensure stable noise free operation even
though the power line varies.
• Illuminated Power Meter
The Illuminated Power Output Watt Meter on the MC303
is peak responding, and indicates the power output of the
amplifier. The Front Panel Meter Illumination may be
switched Off at any time.
• Fiber Optic Solid State Front Panel Illumination
The even illumination of the Front Panel is accomplished
by the combination of custom designed Fiber Optic Light
Diffusers and extra long life Light Emitting Diodes
(LEDs).
• Glass Front Panel and Super Mirror Chassis Finish
The famous McIntosh Illuminated Glass Front Panel and
the Stainless Steel Chassis with Super Mirror Finish en-
sures the pristine beauty of the MC303 will be retained for
many years.
ThermalTrak™ and ON Semiconductor are trademarks of Semicon-
1
ductor Components Industries, LLC
Output Transistors for
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