Page 1
PO WER AMPLIFIER
CONTENTS
Performance Specifications ........................................ 2
Notes ......................................................................... 2
Rear Panel .................................................................. 3
Section Location ........................................................ 3
Block Diagram ........................................................... 4
Interconnection Diagram ...................................... 5 - 8
Multi-channel Schematic and PCB ............................. 9
SERVICE MANUAL
Heatsink Schematic and PCB.............................. 10 - 12
Driver Schematic and PCB ................................. 13 - 15
Capacitor Schematic and PCB ........................... 15 - 16
Meter Schematic and PCB ................................. 17 - 21
Parts List ............................................................ 22 - 24
Exploded Views and Parts Lists .......................... 25 - 28
Repacking Instruction .............................................. 29
Page 2
PERFORMANCE SPECIFICATIONS
Power Output
Minimum sine wave continuous average power output per
channel, all channels operating is:
200 watts into 4 ohm load
120 watts into 8 ohm load
Rated Power Band
20Hz to 20,000Hz
T otal Harmonic Distortion
Maximum T otal Harmonic Distortion at any power
level from 250 milliwatts to rated power output is:
0.005% for 4 or 8 ohm loads
Dynamic Headroom
1.6dB
Frequency Response
+0, -0.25dB from 20Hz to 20,000Hz
+0, -3dB from 10Hz to 100,000Hz
Sensitivity
1 volt
A-Weighted Signal T o Noise Ratio
92dB (113dB below rated output)
Input Impedance
10,000 ohms
Wide Band Damping Factor
100 at 4 ohms
200 at 8 ohms
Power Requirements
100 Volts, 50/60Hz at 13.2 amps
110 Volts, 50/60Hz at 12.0 amps
120 Volts, 50/60Hz at 11.0 amps
220 Volts, 50/60Hz at 6.0 amps
230 Volts, 50/60Hz at 6.0 amps
240 Volts, 50/60Hz at 6.0 amps
Note: Refer to the rear panel of the MC206 for the
correct voltage.
Dimensions
Front Panel: 17-1/2 inches (44.45cm) wide, 7-1/8 inches
(18.10cm) high. Depth behind front mounting panel is 18
inches (45.72cm). Clearance required in front of the Front
Panel is 1 inch (2.54cm) for knobs.
Weight
57 pounds (25.9kg) net, 76 pounds (34.5kg) in shipping
carton
Intermodulation Distortion
Maximum Intermodulation Distortion if instantaneous peak output per channel does not exceed
twice the rated output, for any combination of
frequencies from 20Hz to 20,000Hz, with all
channels operating is:
0.005% for 4 or 8 ohm loads
1. The heavy lines on the schematic 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 (10 megaohm) voltmeter must be used.
3. Unless otherwise specified:
a. Resistor values are in ohms.
b. Capacitor values are microfarads (uF).
c. Inductor values are in microhenries (uH).
NO TES
4. On PC board drawings, Square pad indicates:
a. Polarized Capacitors - Positive
b. Diodes - Cathode
c. Others - Pin 1
5. WARNING
Parts marked with the symbol have critical
characteristics. Use only replacement parts recommended by the manufacturer.
2
Page 3
REAR PANEL
MC206
SECTION LOCATIONS
TOP VIEW WITH COVER REMOVED
3
Page 4
BLOCK DIAGRAM
4
Page 5
INTERCONNECT
MC206
5 6
87
Page 6
2
MULTI-CHANNEL
048551B
3
A
B
C
HEATSINK
049552
9 1210
11
Page 7
4
MC206
A
B
C
DRIVER
049553
13 14
Page 8
4
A
B
C
DRIVER
049553
5
CAPACITOR
049551
15 16
Page 9
MC206
6
METER
049554
17
18 19 20
Page 10
6
METER
049554
PARTS LIST
Reference No.
INTERCONNECT
C 1 .22uF CAP ACITOR 05200500
D1 BRIDGE RECTIFIER 07013900
F1 15A 250V FUSE 08904200
M1 M2 M3 P ANEL METER 12406400
RT1 R T2 THERMISTOR 05200800
S1 METER SWITCH 14625000
S2 POWER SWITCH 14624300
T1 TRANSFORMER 04898000
TB1 TERMINAL BLOCK 07409100
TB2 TB3 TB4 TB5 TB6 TB7 SPEAKER TERMINAL 08412400
049551B MUL TI-CHANNEL PCB
J1- CONN D 25-PIN 11750100
J2- J3- J4- J16- J18- J19- CONN 4 PIN 11721500
J20- J21- JACK MINI 11749400
R 9 RES MF 100 1% 1/4W 14419600
R11 R12 RES MF 1K 1% 1/4W 14409000
049552 HEA TSINK PCB
C1 C2 C10 C11 CAP ELECT 47UF 35V 06644600
C3 C15 CAP MONO .1UF 50V 20% Z5U 06130500
C 4 CAP POL YPROP 0.15UF 10% 250VDC 06436300
C7 C8 C12 C13 CAP MONO 100PF 100V 10% NPO 06130000
C9 C16 C17 C18 CAP MONO .01UF 50V 20% X7R 06130400
D1 D2 D3 D4 D5 D8 D9 D10 D11 D12 DIODE SILICON 07004700
D6 D7 D13 D14 DIODE RECTIFIER 07013100
J1- J2- CONN MALE 9 POS FRICTION LOCK 11724400
J3- CONN HEADER 2 PIN 0.156 11740400
J10 J11 CONN MALE 2 PIN 11721300
Q1 Q12 Q5 Q14 TRANSISTOR NPN 13222300
Q2 Q13 TRANSISTOR PNP 13222400
Q3 Q18 TRANSISTOR NPN POWER 13226800
Q4 Q17 TRANSISTOR PNP POWER 13226700
Q6 Q16 TRANSISTOR NPN 13226200
Q7 Q15 TRANSISTOR PNP 13226100
Q8 Q10 Q21 Q22 Q25 Q26 TRANSISTOR PNP POWER 13223900
Q9 Q11 Q19 Q20 Q23 Q24 TRANSISTOR NPN POWER 13223800
R1 R8 R20 R27 RES MF 221 1% 1/4W 14417200
R2 R9 R22 R24 RES MET OX 680 5% .5W 13709300
R3 R10 R21 R25 RES MF 15K 1% 1/4W 14441200
R6 R11 R19 R26 RES MET OX 1.8K 5% .5W 13709400
R7 R23 RES MET OX 430 5% .5W 13709500
R12 R18 RES MET OX 47 5% .5W 13709600
R13 R28 POT TRIM 200 OHM 20% HORIZ AD 13439000
R3 9 RES MF 2.21 OHM 1/4W 1% 14437800
R40 R41 R42 R43 R44 R45 RES WW DUAL .47 OHM 5% 5W 13919900
R T1 THERMISTOR 100 14427900
049553 DRIVER PCB
C1 C15 C32 C33 CAP MONO .1UF 50V 20% Z5U 06130500
C22 C44 CAP ELECT 100UF 25V 06644700
C27 C28 CAP MONO 100PF 100V 10% NPO 06130000
C29 C30 CAP ELECT 47UF 35V 06644600
C31 C39 CAP ELECT 0.47UF 50V 20% 06624400
C35 C36 C37 C38 C50 C51 C200 CAP ELECT 10UF 100VDC 06646200
C4 0 CAP ELECT 220UF 50V 20% 06625400
Description
Part No.
C47 C48 CAP POLYPROP .047UF 10% 250VDC 06436400
C5 5 CAP MONO .01UF 50V 20% X7R 06130400
IC 1 IC DUAL OPERA TIONAL AMPLIFIER 13326000
J1 JACK PHONO GOLD PJ261G 11743600
J5- J6- CONN MALE 9 POS FRICTION LOCK 11724400
J7- CONN 8 POS MALE FRICTION LOCK 11727500
J8- J9- J10- CONN HEADER 2 PIN 0.156 11740400
J11- CONN 4 PIN 11721500
K1 RELA Y 24VDC 5A 277V AC 08705700
L1 L2 CHOKE OUTPUT .65UH 12229700
LD1 LD2 LDR NETWORK VTL5C9 14417900
Q1 Q7 Q14 Q25 Q26 Q27 Q28 Q39 TRANSISTOR PNP 13222400
Q2 Q10 Q11 Q23 Q24 Q38 TRANSISTOR PNP 120V 13225500
Q5 Q8 Q9 Q19 Q20 Q29 Q30 Q34 TRANSISTOR NPN 13225400
Q6 Q12 Q13 Q15 Q16 Q35 Q42 Q44 TRANSISTOR NPN 13222300
Q17 Q21 TRANSISTOR NPN 13226200
Q18 Q22 TRANSISTOR PNP 13226100
Q40 Q43 TRANSISTOR PNP 13222400
R1 R 2 POT GAIN CONTROL 10K OHM 13448600
R19 R27 R29 R84 R94 R122 RES MF 47.5K 1% 1/4W 14410800
R20 R28 R30 R31 R37 R65 R66 R91 RES MF 681K 1% 1/4W 14444300
R22 R34 R45 R64 R83 RES MF 10K 1% 1/4W 14405300
R36 R97 RES 511 1% 1/4W 14412300
R38 R89 R92 R101 RES MF 1.21K 1% 1/4W 14419100
R41 R55 R96 R98 RES MF 3.32K 1% 1/4W 14409500
R44 R49 RES MF 1.1K 1% 1/4W 14409100
R46 R47 R86 RES MF 4.75K 1% 1/4W 14409700
R48 R61 R67 R68 R123 RES MF 100 1% 1/4W 14419600
R50 R87 RES MF 14.7K 1% 1/4W 14414900
R51 R53 R76 R99 RES MF 221 1% 1/4W 14417200
R52 R75 R105 R108 RES MF 267K 1% 1/4W 14411800
R56 R60 RES FP 22 OHM 1/4W 5% 13703300
R5 9 RES MF 2.21 OHM 1/4W 1% 14437800
R62 R69 R93 R104 RES MF 22.1K 1% 1/4W 14418700
R77 R79 R80 R82 R113 R114 R119 R120 RES CF 10 5% 1/2W 14116500
R118 R121 RES MF 5.62OHM 1% 1/4W 14416800
049551 CAP ACITOR PCB
C 3 CAP ELECT 22UF 100V 06650600
C 4 CAP M POL Y .22UF 5% 63VDC 06432900
C 5 CAP ELECT 10UF 50V 06644500
D1 DIODE RECTIFIER 07013100
IC 1 IC NAND SCHMIT 2-IN X 4 13319200
J4- J16- CONN 4 PIN 11721500
J5- CONN MALE 7 PIN 11721700
J8- J9- J10- J11- J12- J13- CONN HEADER 2 PIN 0.156 11740400
J14 J15 J16 J17 J23 BLADE F ASTON 1/4 INCH 11734200
J22- CONN MALE 3 POS MTS100 NORMAL 11721400
K1 RELA Y 48VDC 08704900
Q1 TRIAC OPTOCOUPLER 13102400
R 1 RES MF 1K 1% 1/4W 14409000
R2 R 4 R 10 RES MF 33.2K 1% 1/4W 14401500
R 3 RES MF 1M 1/4W 14426900
R 5 RES MF 100 1% 1/4W 14419600
R 7 RES WW 1K 5W 10% 13912100
049554 METER PCB
C7 C200 C201 C205 C206 C207 C208 C218 CAP MONO .1UF 50V 20% Z5U 06130500
C9 C217 CAP ELECT 3300UF 35V 06650900
C1 1 CAP ELECT 22UF 50V 06634500
C204 C215 C216 C219 C220 CAP ELECT 100UF 25V 06644700
C209 C210 C211 C212 C213 C214 CAP ELECT 2.2UF 50V 06651100
D14 D46 DIODE RECTIFIER 07013100
D15 D16 D17 D18 D19 D20 D21 D22 D23 DIODE SILICON 07004700
D24 D25 D26 D27 D28 D29 D30 D31 D32 DIODE SILICON 07004700
D33 D34 D35 D36 D37 D38 D47 D48 D49 DIODE SILICON 07004700
D40 D41 D42 D43 D44 D45 LED BAR RED 05813900
D50 D51 D52 DIODE ZENER 16V 5% 500MW 07011400
D53 D54 D55 DIODE SILICON 07004700
DS7 DS8 DS9 DS10 DS11 DS12 LED AMBER 05813300
DS20 LED RED HIGH EFFICIENCY 05814800
DS21 DS22 DS23 DS24 DS25 DS26 DS27 LAMP 14V 05812000
DS27 DS28 DS29 DS50 SOCKET LAMP 0.125 PINS .110 HI 17816200
DS28 DS29 DS31 DS32 DS33 DS50 LAMP 14V 05812000
F1 HOLDER FUSE 5X20MM PCB MOUNT 17815900
IC1 IC 2 IC3 IC QUAD OPAMP NJM4741D 13331200
IC4 I C5 IC 6 IC QUAD ANALOG SW 13311700
IC20 IC REGULA TOR +5 VOL T 13309300
IC21 IC REGULATOR -12V 13315500
IC22 IC REGULATOR 12V 13315600
J1- J2- J3- CONN 8 POS MALE FRICTION LOCK 11727500
J4- CONN MALE 3 POS MTS100 NORMAL 11721400
J6- J8- J9- J17- J18- CONN 4 PIN 11721500
J10- J11- CONN 13 POS 11729800
J12- J13- J14- HEADER 2 PIN .100 11769000
J16- CONN MALE 5 PIN 0.1 POST ASSY 11721600
J18 J19 BLADE F ASTON 1/4 INCH 11734200
K1 RELA Y 24VDC 5A 277V AC 08705700
Q8 Q10 Q11 Q12 Q13 Q14 Q15 Q22 TRANSISTOR NPN 13222300
Q25 Q35 Q57 Q58 Q59 Q60 Q61 Q62 TRANSISTOR PNP 13222400
Q32 Q33 TRANSISTOR POWER N-CHN ENHANCE 13224200
Q34 Q36 Q37 Q38 Q39 Q40 Q41 Q50 TRANSISTOR NPN 13222300
Q51 Q52 Q53 Q54 Q55 Q56 TRANSISTOR NPN 13222300
R2 R3 R 4 R5 R6 R7 RES MF 681 1% 1/4W 14419500
R3 0 RES MF 681K 1% 1/4W 14444300
R98 R148 R166 R169 R172 R174 R181 RES MF 150K 1% 1/4W 14441900
R100 R101 R138 R149 R162 R163 RES MF 20.0 1/4W 14417400
R102 R106 R110 R114 R129 R144 R202 RES MF 100K 1% 1/4W 14411300
R103 R151 R164 R167 R170 R176 RES MF 5.62K OHM 1% 1/4W 14444700
R104 R119 R132 R133 R135 R136 RES MF 15K 1% 1/4W 14441200
R105 R127 R137 RES MF 4.75M 1/4W 1% 14437900
R107 R108 R109 R118 R120 R122 R141 RES MF 3.32K 1% 1/4W 14409500
R111 R116 R134 R145 R160 R161 R192 RES MF 178K 1% 1/4W 14442000
R112 R117 R121 R124 R131 R140 R171 RES MF 10K 1% 1/4W 14405300
R115 R126 R128 R177 R178 RES 26.7K 1% 1/4W 14410500
R123 R146 R156 R195 RES MF 221 1% 1/4W 14417200
R125 R130 R139 RES MF 90.9K 1% 1/4W 14417000
R142 R143 R194 RES MF 3.32K 1% 1/4W 14409500
R175 R199 RES MF 10K 1% 1/4W 14405300
R180 RES MF 18.2K 1% 1/4W 14418100
R185 R186 R187 POT TRIMMER 5K OHM 20% 13438700
R188 R193 RES MF 3.16K 1% 1/4W 14419900
R189 RES MF 7.5K 1% 1/4W 14421000
R190 RES MF 47.5K 1% 1/4W 14410800
R191 R197 RES MF 12.1K 1% 1/4W 14415400
R196 R200 R201 R203 R204 R205 R206 RES MF 178K 1% 1/4W 14442000
R198 RES MF 5.11K 1% 1/4W 14408300
R207 R208 RES MF 178K 1% 1/4W 14442000
21 22 23 24
Page 11
MC206 EXPLODED VIEW
MC206
25 26
Page 12
MC206 EXPLODED VIEW PARTS LIST
Ref
No. Description
1 016446 GLASS
2 049319 KNOB ASSY
3 104017 WASHER FILT BLK 3/4 X1/4 X 1/16
4 004801 BRACKET EXTRUSION
5 018612 END CAP 7”
6 101042 SCREW TS 4-40 X 1/2 SLOT FILLISTER
7 094360 TAPE FOAM 1/2 X 1/2
8 018588 EXTRUSION BOTTOM
9 101172 SCREW TC 6-32 X 1/4 PH FL U/C
10 018587 EXTRUSION TOP
11 094016 TAPE FOAM 1/4 X 1/8
12 017855 PLEXIGLAS
13 092413 ACETATE FILTER BLUE
14 005001 SUB PANEL
15 021159 BUSHING SWITCH
16 146243 POWER SWITCH (W/LOCKWASHER)
17 146250 METER SWITCH (W/LOCKWASHER)
18 101054 SCREW TAPTITE 6-32 X 1/4 PH PAN
19 094017 TAPE FOAM 1/4 X 1/4
20 049554 METER PCB ASSY
21 112086 SPACER NYLON
22 077031 SLEEVING FIBERGLAS #2
23 102001 NUT KEP 4-40 CADMIUM PLATE
24 112051 SPACER 1/8” NYLON
25 124080 METER
26 092341 FILTER AZURE BLUE
27 092342 FILTER PALE BLUE
28 017447 LIGHT BOX PLASTIC
29 114072 RIVET NYLON POP-IN
30 004798 TOP COVER
31 101078 SCREW TAP 8-32 X 5/16 PH PAN BLK
32 021094 SPACER #4 X 1/4
33 004791 TRAY
34 101163 SCREW TC 8-32 X 1/4 PH PN TYPE F
35 106007 SPRING CLIP LATCH TYPE
36 084135 PAD THERMAL
37 104005 WASHER FLAT STEEL 6 X 3/8 X .032
38 102045 NUT KEP 6-32 SPECIAL
39 070139 DIODE BRIDGE RECTIFIER
40 074091 TERMINAL BLOCK AC
41 102022 NUT MACH 4-40 X 3/16 X 1/16
42 104004 WASHER LOCK 5 X .255 INT STAR
43 104001 WASHER FLAT STEEL 4 X 9/32 X .025
44 003855 CLAMP CAPACITOR
45 100118 SCREW MACH 6-32 X 1/2 PH PN
46 066480 CAP ELECT
47 049551 CAPACITOR PCB ASSY
48 100188 SCREW MACH SEMS 10-32 X 3/8
49 048980 TRANSFORMER ASSY
Part
No.
50 098113 DIAL CORD
51 018671 HEATSINK
52 084183 ISOSTRATE
53 112087 SPACER PCB 1/4”
54 101202 SCREW SM 6-20 X 3/4 PH PN TYPE B
55 101059 SCREW 6 X 5/8 PH PN TYPE A
56 114119 CLIP TRANSISTOR 214
57 114118 CLIP TRANSISTOR 218
58 049552 HEATSINK PCB ASSY
59 049553 DRIVER PCB ASSY
60 022185 SPACER #6 X 1/2
61 112088 SUPPORT CIRCUIT BOARD
62 005156 REAR PANEL
63 078122 HOLDER FUSE SOCKET UL/CSA
64 112032 SPACER BLACK NYLON
65 104016 WASHER INT STAR .5 X .630 X .022
66 117487 RECEPT ACLE AC LINE
67 084124 POST DUAL BINDING
68 004800 PLATE OUTPUT
69 104130 WASHER LOCK #10 SPLT PHOS/BRNZ
70 104148 WASHER PLAT BRASS
71 110009 NUT M5 X 0.8 BRASS W/GOLD PLATE
72 102020 NUT MACH 6-32 SELF-LOCK
73 112015 STANDOFF
74 104142 WASHER LOCK 2.5mm INT STAR ZINC
75 101114 SCREW SM 4-24 X 1/2 PH PN TYPE A
76 100271 SCREW MACH SEMS 6-32 X 1/4 PH PN
77 101176 SCREW TC 6-32 X PH PN TYPE F
78 100120 SCREW MACH 10-32 X 1/4 PH PN ZINC
79 104067 WASHER LOCK #10 INT STAR
80 005175 CHASSIS
81 017218 FOOT PLASTIC BLACK
82 104080 WASHER FLAT #10 CLEAR ZINC
83 100159 SCREW 10-32 X 3/4 PH PN BLK
84 101109 SCREW TAP 6-32 X 5/16 PH PN BLK
27 28
Page 13
REPACKING INSTRUCTION
MC206
29
Page 14
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 040818
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