130 watts into 8, 4 or 2 ohm loads is the minimum sine
wave continuous average power output per channel from
20Hz to 20,000Hz with both channels operating.
Total Harmonic Distortion
0.5% maximum harmonic distortion at any power level
from 250 milliwatts to rated power per channel from
20Hz to 20,000Hz with both channels operating.
Intermodulation Distortion
0.5% maximum intermodulation distortion if instantaneous peak power output does not exceed twice the
output rating per channel with both channels operating,
for any combination of frequencies from 20Hz to
20,000Hz.
Rated Power Band
20Hz to 20,000Hz
Frequency Response (at 1 watt)
+0, -0.25dB from 20Hz to 20,000Hz
+0, -3dB from 10Hz to 100,000Hz
Hum and Noise (A-Weighted)
100dB below rated output
Damping Factor
Greater than 18
Output Load Impedance
2, 4 or 8 ohms
Input Sensitivity (Switch Selectable)
2.5 volts for rated output
1.2 volts for rated output (1 volt for 100 watts output)
100 Volts, 50/60Hz at 5.8 Amps
120 Volts, 50/60Hz at 4.8 Amps
230 Volts, 50/60Hz at 2.5 Amps
Note: Refer to the rear panel of the MC2000 for the correct voltage.
Dimensions
17-3/4 inches (45.1cm) wide by 11 inches (27.9cm)
high. Depth behind front panel is 18-3/4 inches (47.6
cm). Handle clearance required in front of the mounting
panel is 1-5/8 inches (4.1 cm).
Finish
Stainless Steel Chassis with Titanium Gold Super Mirror
Finish, Black Transformer Enclosures, Black Base,
Glass Front Panel with gold plated Handles and Knobs
Weight
Amplifier - 135 pounds (61.2 kg) net, 144 pounds
(65.3 kg) in shipping carton
Accessories - 18 pounds (8.2 kg) in shipping carton
1. The heavy lines on the schematics denote the
primary signal path.
2. Unless otherwise noted, all voltages indicated on
the schematics are measured under the following
conditions:
a. AC input at 120 volts, 50/60Hz
b. All voltages are +/-10% with respect to ground.
A high impedance (10megaohm) voltmeter must
be used.
3. Unless otherwise specified:
a. Resistors values are in ohms.
b. Capacitor values are in microfarads (uF).
c. Inductor values are in microhenries (uH).
NOTES
4. On PC Board Drawings, Square Pad Indicates:
a. Polarized Capacitors - Positive
b. Diode - Cathode
c. Others - Pin 1
5. WARNING:
Parts marked with the symbol have critical
characteristics. Use only replacement parts recom
mended by the manufacturer .
2
REAR PANEL
MC2000
3
SECTION LOCATION
TOP VIEW WITH COVER REMOVED
BOTTOM VIEW WITH COVER REMOVED
4
BLOCK DIAGRAM
VOLTAGE
N.F.B.
MC2000
LEFT
INPUTS
UNBALANCED
BALANCED
+
-
UNITY
GAIN
AMP
UNITY
INVERTING
AMP
BALANCED/
UNBALANCED
RELAY
BALANCED/
UNBALANCED
MODE SWITCH
1.2V/2.5V
LEVEL
RELAY
INPUT
LEVEL
SWITCH
MUTE
INPUT
AMP
PHASE
INVERTER
METER
HOLD
SWITCH
BUFFER
BUFFER
DRIVER
AMP
DRIVER
AMP
LOG
AMP
LOG
AMP
BUFFER
BIAS
CONTROL
BUFFER
RECTIFIER
HOLD
CIRCUIT
HOLD
CIRCUIT
RECTIFIER
OUTPUT
AMP
OUTPUT
AMP
DC
AMP
DC
AMP
DC
AMP
OUTPUT
TRANS-
FORMER
L. METER
8
4
2
COM
9
9
LEFT
OUTPUT
9
RIGHT
INPUTS
BALANCED
UNBALANCED
-
+
UNITY
INVERTING
AMP
UNITY
GAIN
AMP
BALANCED/
UNBALANCED
RELAY
1.2V/2.5V
LEVEL
RELAY
PHASE
INVERTER
MUTEBUFFER
INPUT
AMP
BUFFER
VOLTAGE
N.F.B.
DRIVER
AMP
DRIVER
AMP
BUFFER
BIAS
CONTROL
BUFFER
R. METER
DC
AMP
OUTPUT
AMP
OUTPUT
TRANS-
FORMER
OUTPUT
AMP
POWER SUPPLY SECTION
100/120/230VAC
50/60Hz
8
4
2
COM
POWER
RELAY
FUSE
9
9
RIGHT
OUTPUT
9
12VAC
LEFT
POWER
SUPPLY
RIGHT
POWER
SUPPLY
FUSE
FUSE
STANDBY
TRANSFORMER
INRUSH
CURRENT
LIMITER
INRUSH
CURRENT
LIMITER
CONTROL
5V SUPPLY
INPUT
VOLTAGE
SELECTOR
INPUT
VOLTAGE
SELECTOR
POWER
SWITCH
POWER
TRANSFORMER
POWER
TRANSFORMER
POWER
CONTROL
-+
12V
DC
12VAC
-+
12V
DC
IN
OUT
REMOTE
JACKS
12V
DC
12V
DC
MAIN 500V
DC SUPPLY
MAIN 500V
DC SUPPLY
-
150 AND
-
300V DC
-
150 AND
-
300V DC
REMOTE
LAMP
5
6
INTERCONNECT
7
8
MC2000
2R
2L
INPUT
049305
9
100
3R3L
MAIN
049306
11
12
MC2000
3R
3L
MAIN
049306
4R
4L
POWER SUPPLY
049308
13
14
5
AC POWER 049309
15
16
MC2000
6
SWITCH REMOTE 049310
17
18
7R7L
METER
049307
19
20
MC2000
8R8L
10
LAMP
BIAS CONTROL
049311
049311
11R 11L
9R9L
LOGO LAMP
METER LAMP
049311
049337
12R 12L
OUTPUT
049312
21
22
PARTS LIST
PART NO.DESCRIPTIONREF. NO.
049305 Input
066316CAP ELECT 10UF 20% 25V NPC1 C3
070047SILICON DIODE 1N4148 T&RD1 D2
087056REED RELAY FORM 1C 5V 125OHMK1 K2
117216MALE CONN 5 PIN 0.1 POST ASSYJ2117221MALE CONN 3 POS RT ANGLEJ31177229 POSITION RECEPTACLEJ1132222N. CHANNEL FETQ6
144015MF RES 33.2K 1% 1/4WR1
144104METAL FILM RES 20K 1% 1/4WR6
144141MF RES 27.4K 1% 1/4WR4
144154RES MF 12.1K 1% 1/4WR23
144269METAL FILM RES 1M 1/4WR11 R12
144379RES METAL FILM 4.75M 1/4W 1%R19
144412MF RES 15K 1% 1/4WR24
144421MF RES 221K 1% 1/4WR2
144423MF RES 174 OHM 1% 1/2WR8 R20
144439MF RES 24.9K 1% 1/4WR5 R7
061248DISC CAP .1MF 25V Y5TC2
064329CAP M POLY .22UF 5% 63VDCC1
117214MALE CONN 3-POS MTS100 NORMALJ3
117218MALE CONN 6-POS FRICTION LKJ4117406MIN. PHONO JACK R657J1- J2-
132171TRANSISTOR NPNQ1
133192IC NAND SCHMIT 2-IN X 4IC1
144082METL FILM RES 68.1 OHM 1% 1/4WR5 R6
144090METAL FILM RES 1K 1% 1/4WR1
144187METAL FILM RES 22.1K 1% 1/4WR2 R3
144269METAL FILM RES 1M 1/4WR4
148074SLIDE SWITCH DPDT 3MMS1 S2
1016403FRONT GLASS
2049334GOLD KNOB
3104164FELT WASHER
4018628HANDLE FRONT
5018625PANEL SIDE LEFT
6018624PANEL SIDE RIGHT
7100200MS 10-32 X 1/2 PHIL TRUSS BLK
8017790PLEXIGLAS PANEL
9092424METER COLOR FILTER
10005007PANEL PLATE
11101142CAP SCREW 1/4 -20 X 1-1/4
12101215SEMS MS 8-32 X 1/4 PHIL PAN
13004961DUST COVER
14005006GUSSET RIGHT
15005005GUSSET LEFT
16005039TOP SUBPANEL BRACKET
17102003MACH NUT: 6-32 W/LOCK
18101078TS 8-32 X 5/16 PHIL PAN BLK
19126588SIGNATURE NAMEPLATE
20049379WINDOW TRIM
21101054TS 6-32 X 1/4 PH PAN TAPTITE BLK
Part
No.
Description
22124071METER
23005008SWITCH BRACKET
24049357METER ROTARY SWITCH PCB
25049338PANEL/LED LIGHT PCB
26104163M7 INTERNAL TOOTH LOCKWASHER
27110004M7 X .75 HEX CONTROL NUT
28004970SUBPANEL
29092401BLUE FILTER PALE
30092400BLUE FILTER AZURE
31017749METER LIGHT BOX
32049336METER LIGHT BOX PCB
33114072PLASTIC RIVET
34049307METER PCB
35100296SEMS 4-40 X 5/16 PHIL PAN
36094360FOAM TAPE 1/2” X 1/2”
37094017FOAM TAPE 1/4” X 1/4”
38049339PANEL LIGHT PCB
39005018CHASSIS GOLD
4016506512AX7A TUBE
4116506712AT7 TUBE
42165069KT88 TUBE
43017761AIR PIPE
44049305INPUT SWITCH PCB
45114139PCB SUPPORT
46017801PLASTIC RIVET
47100292MS 6-32 X 3/8 PH FH BLK ZINC
48102006MACH NUT: 10-32 W/LOCK
49049304POWER TRANSFORMER
50126582POWER TRANSFORMER DECAL
51049301OUTPUT TRANSFORMER
52126581OUTPUT TRANSFORMER DECAL
53052093TUBE COVER
54101214SCREW, TUBE COVER
55049306MAIN AMP PCB
56004967FOOT CHANNEL RIGHT
57004968FOOT CHANNEL LEFT
58018626FOOT
59004971CHASSIS SUPPORT
60024010FOOT PAD
61005071INPUT SHIELD BRACKET
62005032CHASSIS BASE
63049310SWITCH REMOTE PCB
64049308POWER SUPPLY PCB
65049309AC POWER PCB
66018622HANDLE REAR
67117742RCA JACK RED
68117743RCA JACK WHITE
69117487AC LINE RECEPTACLE
70178122FUSE HOLDER W/HARDWARE
71117741BINDING POST BLACK
72117740BINDING POST RED
73117744XLR RECEPTACLE
74100195MS 4-40 X 3/8 PHIL OVAL GOLD
75104165LW INTERNAL TOOTH
76102052NUT GOLD
771001101/4-20 X 5/8 PAN PH BLK ZINC
78104162LOCKWASHER INTERNAL TOOTH
79102051HEX NUT M9 X .75 GOLD PLATED
80049312OUTPUT TERMINAL PCB
81005035BIAS PLATE LEFT
82005036BIAS PLATE RIGHT
83049311BIAS PCB
84101193SEMS 4-40 X 1/4 PHIL PAN BLK ZINC
85004974BIAS COVER
86100193MS 4-40 X 1/4 FLAT PH BLK ZINC
87004969BOTTOM COVER
88100159MS 10-32 X 3/4 PH PAN BLK ZINC
27
280
REPACKING INSTRUCTIONS
29
POWER AMPLIFIER
SERVICE MANUAL
The continuous improvement of it’s products is the policy of McIntosh Laboratory Incorporated, who reserve the right to improve design without notice.
Because of the constant upgrading of McIntosh products’ circuitry and components, the Company cannot insure, and does not warrant, the accuracy of the
within schematic material, which is intended for information only.
McINTOSH LABORATORY, INC., 2 CHAMBERS STREET, BINGHAMTON, NEW YORK 13903 Printed in U.S.A. Part Number 040702
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