McIntosh MC275 Owner's Manual download pdf (Page 7)

General Information, Cable Information, Introduction and Performance Features

XLR Connectors

Below is the Pin configuration for the XLR Balanced

Input, Input/Output Connectors on the MC275. Refer

to the diagram for connection:

PIN 1: Shield/Ground

PIN 2: + Output

PIN 3: - Output

Power Control Connector

The MC275 Power Control Input receives an On/Off

signal from +5 to +12 volts. The Power Control Output

will in turn provide a +12 volt Output Signal with a

current up to 20mA. An additional connection is for

controlling the green illumination of the MC275 Small

Signal Tubes when connected to

a compatible McIntosh Pream-

plifier or A/V Control Center

Power Control Output. The 1/8

inch stereo mini phone plug con-

nects to a McIntosh Preamplifier

or A/V Control Center Power Control Output.

Note: When it is desired to switch Off the green il-

lumination of the Small Signal Tubes, and the

MC275 is not connected to a McIntosh McIn-

tosh Preamplifier or A/V Control Center with

meter illumination control, connect a 1/8 inch

Mono mini phone plug to the POWER CON-

TROL IN jack.

Connector and Cable Information

PIN 2 PIN 1

PIN 3

PIN 1

PIN 2

PIN 3

Introduction

Now you can take advantage of traditional McIntosh

standards of excellence in the MC275 Tube Power

Amplifier. The 75 watt power output per channel

will drive any high quality Loudspeaker System. 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 is a Tube Power Amplifier with a capabil-

ity of 75 watts per channel into 4, 8 or 16 ohm Loud-

speakers with less than 0.5% distortion. It may also

be operated in mono at 150 watts into 2, 4, or 8 ohm

Loudspeaker.

• Unity Coupled Circuitry

The MC275 Power Amplifier uses the famous McIn-

tosh Patented Unity Coupled Circuit which provides

low distortion, extended frequency response and cool

operating output tubes.

• Multifilar Wound Output Transformer

The MC275 Output Transformer Windings are part

of the Unity Coupled Circuitry. There are two bifilar

wound primaries, one for the cathodes and one for

the plates. The secondary winding is wound together

with the primary windings. This provides very close

primary to secondary coupling. The result is flat fre-

quency response and wide power bandwidth.

• Balanced and Unbalanced Input

Balanced connections guard against induced noise and

allow long cable runs without compromising sound

quality.

• Sentry Monitor Tube Protection

McIntosh Sentry Monitor Tube Protection Circuits

ensure the MC275 will have a long and trouble free

operating life.

• Gold Plated Connectors and Tube Socket Con-

tacts

Gold Plated Input Jacks and Output Binding Posts

provide trouble free connections. Ceramic tube sock-

ets with gold plated contacts provide protection from

atmospheric contamination. Output Tube Sockets

include Air-Pipe cooling at their bases.

• Custom Gold Plated Jumper Bars

To facilitate the MC275 Power Amplifier Monaural

Parallel Mode of Operation, there are two Custom De-

signed Gold Plated Jumper Bars included. These bars

provide maximum power transfer and ease of connec-

tion to the Output Binding Posts.

• Special Power Supply

A regulated Power Supply, a very large core Power

Transformer and large capacitors ensure stable noise

free operation even though the power line varies.

• LED Tube Illumination

Tri-Color LEDs illuminate the small signal process-

ing tubes of the MC275. They indicate tube warm up,

normal and sentry monitor modes of operation.

• Titanium Chassis with Super Mirror Finish

The famous McIntosh Stainless Steel Chassis with

Super Mirror Finish ensures the pristine beauty of the

MC275 will be retained for many years.

INPUT

IN/OUT

Power

Control

Meter

Illumination

Control

Ground

1 2 3 4 5 6 7 8 9 10 11 12 ... 19 20

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McIntosh MC275 Owner's Manual Page 7

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