McIntosh MC901 User Manual

3
Thank you from all of us at
McIntosh
You have invested in a precision instrument that will
provide you with many years of enjoyment. Please
take a few moments to familiarize yourself with
the features and instructions to get the maximum
performance from your equipment.
If you need further technical assistance, please contact
your dealer who may be more familiar with your
particular setup including other brands. You can also
contact McIntosh with additional questions or in the
unlikely event of needing service.
McIntosh Laboratory, Inc.
2 Chambers Street
Binghamton, New York 13903
Technical Assistance: (607) 723-3512
Customer Service: (607) 723-3515
Fax:(607) 724-0549
Email: support@mcintoshlabs.com
Website: mcintoshlabs.com
Copyright 2019 © by McIntosh Laboratory, Inc
List of Figures
Figure 01– Removing Tube Cover Screws ........... 5
Figure 02– Remove Protective Foam ................... 5
Figure 03– Tubes Revealed ................................... 5
Figure 04– Rear View .......................................... 6
Figure 05– XLR Pin Configuration ..................... 7
Figure 06– Power Control (trigger) mini plug ...... 8
Figure 07– Loudspeaker Wire Gauge Guide ........ 8
Figure 08– Opening Output Terminal .................. 9
Figure 09– Tightening Output Terminal ............. 9
Figure 10– Terminal Connection Covers ............. 9
Figure 11– Terminal Connection Cover openings 9
Figure 12– Circuit Breaker ................................. 10
Figure 13– MC901 Connection Diagram ........... 11
Figure 14– EQ Knobs ........................................ 12
Figure 15– Vacuum Tube Positions .................... 13
Figure 16– Dual Meter ....................................... 13
Figure 17– Front Knobs and LEDs ..................... 14
Figure 18– Roll-Off for Low Pass Filter ............ 16
Figure 19– Roll-Off for High Pass Filter ........... 17
Figure 20– 1K Roll-off Combined Graph .......... 18
Table of Contents
Safety First ............................................................. 2
Thank you from all of us at McIntosh ................... 3
Make a Note ........................................................... 3
One of a Kind ........................................................ 4
What is in the box .................................................. 5
Where to put it ....................................................... 5
Removal of Foam Inserts over Vacuum Tubes ...... 5
Rear Connections and Switches ............................ 6
Connections on the Back ....................................... 7
AC Power .......................................................... 7
Input Mode ........................................................ 7
Input Select Switch ........................................... 7
Balanced and Unbalanced Inputs ..................... 7
Composite or Direct Inputs ............................... 7
Power Control .................................................. 8
Auto Off Switch ................................................ 8
Connecting a Speaker ............................................ 8
A Question of Impedance ................................. 8
The Speaker Wire ............................................. 8
The Output Terminal Hookup .......................... 8
Remove Loudspeaker Jumpers .............................. 9
Sentry Monitor ..................................................... 10
Quad Balanced..................................................... 10
Circuit Breaker .................................................... 10
MC901 Connection Diagram ............................... 11
Setting the Filters ................................................. 12
Low Pass Filter ............................................... 12
High Pass Filter .............................................. 12
Setting the Level Adjust ...................................... 12
Vacuum Tubes Used in the MC901 ..................... 12
The Front of the MC901 ...................................... 13
The Dual Meter ............................................... 13
Meter Control Knob ........................................ 14
Power Control Knob ....................................... 14
Power Guard LED........................................... 14
Power Guard Screen Grid Sensor (SGS) LED 14
Make a Note
For future reference, you can jot down your serial
number and purchase information here. We can
identify your purchase from this information if the
occasion should arise.
Serial Number:
Purchase Date:
Dealer Name:
Repacking the MC901 .........................................15
Roll-off for Crossover Points ..............................16
Roll-off for 1K Crossover Point ........................... 18
Solid State Specifications ....................................19
Vacuum Tube Specifications ...............................19
General Specifications ......................................... 19

McIntosh MC901 Specifications

General

Brand	McIntosh
Model	MC901
Category	Amplifier
Language	English