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POWER AMPLIFIER
CONTENTS
Performance Specifications ........................................ 2 Heatsink Schematic and PCB .............................. 10 - 12
Notes ......................................................................... 2 Driver Schematic and PCB ................................. 13 - 15
Rear Panel .................................................................. 3 Capacitor Schematic and PCB ........................... 15 - 16
Section Location ........................................................ 3 Meter Schematic and PCB ................................. 17 - 21
Block Diagram ........................................................... 4 Parts List ............................................................ 22 - 24
Interconnection Diagram ...................................... 5 - 8 Exploded Views and Parts Lists .......................... 25 - 28
Multi-channel Schematic and PCB ............................. 9 Repacking Instruction .............................................. 29
SERVICE MANUAL
PERFORMANCE SPECIFICATIONS
Power Output Input Impedance
Minimum sine wave continuous average power output per 10,000 ohms
channel, all channels operating is:
200 watts into 4 ohm load Wide Band Damping Factor
120 watts into 8 ohm load 100 at 4 ohms
200 at 8 ohms
Rated Power Band
20Hz to 20,000Hz Power Requirements
100 Volts, 50/60Hz at 13.2 amps
Total Harmonic Distortion 110 Volts, 50/60Hz at 12.0 amps
Maximum Total Harmonic Distortion at any power 120 Volts, 50/60Hz at 11.0 amps
level from 250 milliwatts to rated power output is: 220 Volts, 50/60Hz at 6.0 amps
0.005% for 4 or 8 ohm loads 230 Volts, 50/60Hz at 6.0 amps
240 Volts, 50/60Hz at 6.0 amps
Dynamic Headroom Note: Refer to the rear panel of the MC206 for the
1.6dB correct voltage.
Frequency Response Dimensions
+0, -0.25dB from 20Hz to 20,000Hz Front Panel: 17-1/2 inches (44.45cm) wide, 7-1/8 inches
+0, -3dB from 10Hz to 100,000Hz (18.10cm) high. Depth behind front mounting panel is 18
inches (45.72cm). Clearance required in front of the Front
Sensitivity Panel is 1 inch (2.54cm) for knobs.
1 volt
Weight
A-Weighted Signal To Noise Ratio 57 pounds (25.9kg) net, 76 pounds (34.5kg) in shipping
92dB (113dB below rated output) carton
Intermodulation Distortion
Maximum Intermodulation Distortion if instan-
taneous 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
NOTES
1. The heavy lines on the schematic denote the primary 4. On PC board drawings, Square pad indicates:
signal path. a. Polarized Capacitors - Positive
b. Diodes - Cathode
2. Unless otherwise noted, all voltages indicated on the c. Others - Pin 1
schematics are measured under the following conditions:
a. AC input at 120 volts, 50/60Hz. 5. WARNING
b. All voltages are +/-10% with respect to ground. A Parts marked with the symbol have critical
high impedance (10 megaohm) voltmeter must be used. characteristics. Use only replacement parts recom-
mended by the manufacturer.
3. Unless otherwise specified:
a. Resistor values are in ohms.
b. Capacitor values are microfarads (uF).
c. Inductor values are in microhenries (uH).
2
MC206
REAR PANEL
SECTION LOCATIONS
TOP VIEW WITH COVER REMOVED
3
BLOCK DIAGRAM
4
MC206
INTERCONNECT
5 6 7 8
A
2 MULTI-CHANNEL 048551B 3 B
C
HEATSINK 049552
9 10 11 12
MC206
A
4 B
C DRIVER 049553
13 14
A
4
B
C
DRIVER 049553 5 CAPACITOR 049551
15 16
MC206
6 METER 049554
17 18 19 20
6 METER 049554 PARTS LIST C47 C48
C55
CAP POLYPROP .047UF 10% 250VDC
CAP MONO .01UF 50V 20% X7R
06436400
06130400
C209 C210 C211 C212 C213 C214
D14 D46
CAP ELECT 2.2UF 50V
DIODE RECTIFIER
06651100
07013100
IC1 IC DUAL OPERATIONAL AMPLIFIER 13326000 D15 D16 D17 D18 D19 D20 D21 D22 D23 DIODE SILICON 07004700
Reference No. Description Part No. J1 JACK PHONO GOLD PJ261G 11743600 D24 D25 D26 D27 D28 D29 D30 D31 D32 DIODE SILICON 07004700
J5- J6- CONN MALE 9 POS FRICTION LOCK 11724400 D33 D34 D35 D36 D37 D38 D47 D48 D49 DIODE SILICON 07004700
INTERCONNECT J7- CONN 8 POS MALE FRICTION LOCK 11727500 D40 D41 D42 D43 D44 D45 LED BAR RED 05813900
C1 .22uF CAPACITOR 05200500 J8- J9- J10- CONN HEADER 2 PIN 0.156 11740400 D50 D51 D52 DIODE ZENER 16V 5% 500MW 07011400
D1 BRIDGE RECTIFIER 07013900 J11- CONN 4 PIN 11721500 D53 D54 D55 DIODE SILICON 07004700
F1 15A 250V FUSE 08904200 K1 RELAY 24VDC 5A 277VAC 08705700 DS7 DS8 DS9 DS10 DS11 DS12 LED AMBER 05813300
M1 M2 M3 PANEL METER 12406400 L1 L2 CHOKE OUTPUT .65UH 12229700 DS20 LED RED HIGH EFFICIENCY 05814800
RT1 RT2 THERMISTOR 05200800 LD1 LD2 LDR NETWORK VTL5C9 14417900 DS21 DS22 DS23 DS24 DS25 DS26 DS27 LAMP 14V 05812000
S1 METER SWITCH 14625000 Q1 Q7 Q14 Q25 Q26 Q27 Q28 Q39 TRANSISTOR PNP 13222400 DS27 DS28 DS29 DS50 SOCKET LAMP 0.125 PINS .110 HI 17816200
S2 POWER SWITCH 14624300 Q2 Q10 Q11 Q23 Q24 Q38 TRANSISTOR PNP 120V 13225500 DS28 DS29 DS31 DS32 DS33 DS50 LAMP 14V 05812000
T1 TRANSFORMER 04898000 Q5 Q8 Q9 Q19 Q20 Q29 Q30 Q34 TRANSISTOR NPN 13225400 F1 HOLDER FUSE 5X20MM PCB MOUNT 17815900
TB1 TERMINAL BLOCK 07409100 Q6 Q12 Q13 Q15 Q16 Q35 Q42 Q44 TRANSISTOR NPN 13222300 IC1 IC2 IC3 IC QUAD OPAMP NJM4741D 13331200
TB2 TB3 TB4 TB5 TB6 TB7 SPEAKER TERMINAL 08412400 Q17 Q21 TRANSISTOR NPN 13226200 IC4 IC5 IC6 IC QUAD ANALOG SW 13311700
Q18 Q22 TRANSISTOR PNP 13226100 IC20 IC REGULATOR +5 VOLT 13309300
049551B MULTI-CHANNEL PCB Q40 Q43 TRANSISTOR PNP 13222400 IC21 IC REGULATOR -12V 13315500
J1- CONN D 25-PIN 11750100 R1 R2 POT GAIN CONTROL 10K OHM 13448600 IC22 IC REGULATOR 12V 13315600
J2- J3- J4- J16- J18- J19- CONN 4 PIN 11721500 R19 R27 R29 R84 R94 R122 RES MF 47.5K 1% 1/4W 14410800 J1- J2- J3- CONN 8 POS MALE FRICTION LOCK 11727500
J20- J21- JACK MINI 11749400 R20 R28 R30 R31 R37 R65 R66 R91 RES MF 681K 1% 1/4W 14444300 J4- CONN MALE 3 POS MTS100 NORMAL 11721400
R9 RES MF 100 1% 1/4W 14419600 R22 R34 R45 R64 R83 RES MF 10K 1% 1/4W 14405300 J6- J8- J9- J17- J18- CONN 4 PIN 11721500
R11 R12 RES MF 1K 1% 1/4W 14409000 R36 R97 RES 511 1% 1/4W 14412300 J10- J11- CONN 13 POS 11729800
R38 R89 R92 R101 RES MF 1.21K 1% 1/4W 14419100 J12- J13- J14- HEADER 2 PIN .100 11769000
049552 HEATSINK PCB R41 R55 R96 R98 RES MF 3.32K 1% 1/4W 14409500 J16- CONN MALE 5 PIN 0.1 POST ASSY 11721600
C1 C2 C10 C11 CAP ELECT 47UF 35V 06644600 R44 R49 RES MF 1.1K 1% 1/4W 14409100 J18 J19 BLADE FASTON 1/4 INCH 11734200
C3 C15 CAP MONO .1UF 50V 20% Z5U 06130500 R46 R47 R86 RES MF 4.75K 1% 1/4W 14409700 K1 RELAY 24VDC 5A 277VAC 08705700
C4 CAP POLYPROP 0.15UF 10% 250VDC 06436300 R48 R61 R67 R68 R123 RES MF 100 1% 1/4W 14419600 Q8 Q10 Q11 Q12 Q13 Q14 Q15 Q22 TRANSISTOR NPN 13222300
C7 C8 C12 C13 CAP MONO 100PF 100V 10% NPO 06130000 R50 R87 RES MF 14.7K 1% 1/4W 14414900 Q25 Q35 Q57 Q58 Q59 Q60 Q61 Q62 TRANSISTOR PNP 13222400
C9 C16 C17 C18 CAP MONO .01UF 50V 20% X7R 06130400 R51 R53 R76 R99 RES MF 221 1% 1/4W 14417200 Q32 Q33 TRANSISTOR POWER N-CHN ENHANCE 13224200
D1 D2 D3 D4 D5 D8 D9 D10 D11 D12 DIODE SILICON 07004700 R52 R75 R105 R108 RES MF 267K 1% 1/4W 14411800 Q34 Q36 Q37 Q38 Q39 Q40 Q41 Q50 TRANSISTOR NPN 13222300
D6 D7 D13 D14 DIODE RECTIFIER 07013100 R56 R60 RES FP 22 OHM 1/4W 5% 13703300 Q51 Q52 Q53 Q54 Q55 Q56 TRANSISTOR NPN 13222300
J1- J2- CONN MALE 9 POS FRICTION LOCK 11724400 R59 RES MF 2.21 OHM 1/4W 1% 14437800 R2 R3 R4 R5 R6 R7 RES MF 681 1% 1/4W 14419500
J3- CONN HEADER 2 PIN 0.156 11740400 R62 R69 R93 R104 RES MF 22.1K 1% 1/4W 14418700 R30 RES MF 681K 1% 1/4W 14444300
J10 J11 CONN MALE 2 PIN 11721300 R77 R79 R80 R82 R113 R114 R119 R120 RES CF 10 5% 1/2W 14116500 R98 R148 R166 R169 R172 R174 R181 RES MF 150K 1% 1/4W 14441900
Q1 Q12 Q5 Q14 TRANSISTOR NPN 13222300 R118 R121 RES MF 5.62OHM 1% 1/4W 14416800 R100 R101 R138 R149 R162 R163 RES MF 20.0 1/4W 14417400
Q2 Q13 TRANSISTOR PNP 13222400 R102 R106 R110 R114 R129 R144 R202 RES MF 100K 1% 1/4W 14411300
Q3 Q18 TRANSISTOR NPN POWER 13226800 049551 CAPACITOR PCB R103 R151 R164 R167 R170 R176 RES MF 5.62K OHM 1% 1/4W 14444700
Q4 Q17 TRANSISTOR PNP POWER 13226700 C3 CAP ELECT 22UF 100V 06650600 R104 R119 R132 R133 R135 R136 RES MF 15K 1% 1/4W 14441200
Q6 Q16 TRANSISTOR NPN 13226200 C4 CAP M POLY .22UF 5% 63VDC 06432900 R105 R127 R137 RES MF 4.75M 1/4W 1% 14437900
Q7 Q15 TRANSISTOR PNP 13226100 C5 CAP ELECT 10UF 50V 06644500 R107 R108 R109 R118 R120 R122 R141 RES MF 3.32K 1% 1/4W 14409500
Q8 Q10 Q21 Q22 Q25 Q26 TRANSISTOR PNP POWER 13223900 D1 DIODE RECTIFIER 07013100 R111 R116 R134 R145 R160 R161 R192 RES MF 178K 1% 1/4W 14442000
Q9 Q11 Q19 Q20 Q23 Q24 TRANSISTOR NPN POWER 13223800 IC1 IC NAND SCHMIT 2-IN X 4 13319200 R112 R117 R121 R124 R131 R140 R171 RES MF 10K 1% 1/4W 14405300
R1 R8 R20 R27 RES MF 221 1% 1/4W 14417200 J4- J16- CONN 4 PIN 11721500 R115 R126 R128 R177 R178 RES 26.7K 1% 1/4W 14410500
R2 R9 R22 R24 RES MET OX 680 5% .5W 13709300 J5- CONN MALE 7 PIN 11721700 R123 R146 R156 R195 RES MF 221 1% 1/4W 14417200
R3 R10 R21 R25 RES MF 15K 1% 1/4W 14441200 J8- J9- J10- J11- J12- J13- CONN HEADER 2 PIN 0.156 11740400 R125 R130 R139 RES MF 90.9K 1% 1/4W 14417000
R6 R11 R19 R26 RES MET OX 1.8K 5% .5W 13709400 J14 J15 J16 J17 J23 BLADE FASTON 1/4 INCH 11734200 R142 R143 R194 RES MF 3.32K 1% 1/4W 14409500
R7 R23 RES MET OX 430 5% .5W 13709500 J22- CONN MALE 3 POS MTS100 NORMAL 11721400 R175 R199 RES MF 10K 1% 1/4W 14405300
R12 R18 RES MET OX 47 5% .5W 13709600 K1 RELAY 48VDC 08704900 R180 RES MF 18.2K 1% 1/4W 14418100
R13 R28 POT TRIM 200 OHM 20% HORIZ AD 13439000 Q1 TRIAC OPTOCOUPLER 13102400 R185 R186 R187 POT TRIMMER 5K OHM 20% 13438700
R39 RES MF 2.21 OHM 1/4W 1% 14437800 R1 RES MF 1K 1% 1/4W 14409000 R188 R193 RES MF 3.16K 1% 1/4W 14419900
R40 R41 R42 R43 R44 R45 RES WW DUAL .47 OHM 5% 5W 13919900 R2 R4 R10 RES MF 33.2K 1% 1/4W 14401500 R189 RES MF 7.5K 1% 1/4W 14421000
RT1 THERMISTOR 100 14427900 R3 RES MF 1M 1/4W 14426900 R190 RES MF 47.5K 1% 1/4W 14410800
R5 RES MF 100 1% 1/4W 14419600 R191 R197 RES MF 12.1K 1% 1/4W 14415400
049553 DRIVER PCB R7 RES WW 1K 5W 10% 13912100 R196 R200 R201 R203 R204 R205 R206 RES MF 178K 1% 1/4W 14442000
C1 C15 C32 C33 CAP MONO .1UF 50V 20% Z5U 06130500 R198 RES MF 5.11K 1% 1/4W 14408300
C22 C44 CAP ELECT 100UF 25V 06644700 049554 METER PCB R207 R208 RES MF 178K 1% 1/4W 14442000
C27 C28 CAP MONO 100PF 100V 10% NPO 06130000 C7 C200 C201 C205 C206 C207 C208 C218 CAP MONO .1UF 50V 20% Z5U 06130500
C29 C30 CAP ELECT 47UF 35V 06644600 C9 C217 CAP ELECT 3300UF 35V 06650900
C31 C39 CAP ELECT 0.47UF 50V 20% 06624400 C11 CAP ELECT 22UF 50V 06634500
C35 C36 C37 C38 C50 C51 C200 CAP ELECT 10UF 100VDC 06646200 C204 C215 C216 C219 C220 CAP ELECT 100UF 25V 06644700
C40 CAP ELECT 220UF 50V 20% 06625400
21 22 23 24
MC206
MC206 EXPLODED VIEW
25 26
MC206 EXPLODED VIEW PARTS LIST
Ref Part
No. No. Description
1 016446 GLASS 50 098113 DIAL CORD
2 049319 KNOB ASSY 51 018671 HEATSINK
3 104017 WASHER FILT BLK 3/4 X1/4 X 1/16 52 084183 ISOSTRATE
4 004801 BRACKET EXTRUSION 53 112087 SPACER PCB 1/4"
5 018612 END CAP 7" 54 101202 SCREW SM 6-20 X 3/4 PH PN TYPE B
6 101042 SCREW TS 4-40 X 1/2 SLOT FILLISTER 55 101059 SCREW 6 X 5/8 PH PN TYPE A
7 094360 TAPE FOAM 1/2 X 1/2 56 114119 CLIP TRANSISTOR 214
8 018588 EXTRUSION BOTTOM 57 114118 CLIP TRANSISTOR 218
9 101172 SCREW TC 6-32 X 1/4 PH FL U/C 58 049552 HEATSINK PCB ASSY
10 018587 EXTRUSION TOP 59 049553 DRIVER PCB ASSY
11 094016 TAPE FOAM 1/4 X 1/8 60 022185 SPACER #6 X 1/2
12 017855 PLEXIGLAS 61 112088 SUPPORT CIRCUIT BOARD
13 092413 ACETATE FILTER BLUE 62 005156 REAR PANEL
14 005001 SUB PANEL 63 078122 HOLDER FUSE SOCKET UL/CSA
15 021159 BUSHING SWITCH 64 112032 SPACER BLACK NYLON
16 146243 POWER SWITCH (W/LOCKWASHER) 65 104016 WASHER INT STAR .5 X .630 X .022
17 146250 METER SWITCH (W/LOCKWASHER) 66 117487 RECEPTACLE AC LINE
18 101054 SCREW TAPTITE 6-32 X 1/4 PH PAN 67 084124 POST DUAL BINDING
19 094017 TAPE FOAM 1/4 X 1/4 68 004800 PLATE OUTPUT
20 049554 METER PCB ASSY 69 104130 WASHER LOCK #10 SPLT PHOS/BRNZ
21 112086 SPACER NYLON 70 104148 WASHER PLAT BRASS
22 077031 SLEEVING FIBERGLAS #2 71 110009 NUT M5 X 0.8 BRASS W/GOLD PLATE
23 102001 NUT KEP 4-40 CADMIUM PLATE 72 102020 NUT MACH 6-32 SELF-LOCK
24 112051 SPACER 1/8" NYLON 73 112015 STANDOFF
25 124080 METER 74 104142 WASHER LOCK 2.5mm INT STAR ZINC
26 092341 FILTER AZURE BLUE 75 101114 SCREW SM 4-24 X 1/2 PH PN TYPE A
27 092342 FILTER PALE BLUE 76 100271 SCREW MACH SEMS 6-32 X 1/4 PH PN
28 017447 LIGHT BOX PLASTIC 77 101176 SCREW TC 6-32 X PH PN TYPE F
29 114072 RIVET NYLON POP-IN 78 100120 SCREW MACH 10-32 X 1/4 PH PN ZINC
30 004798 TOP COVER 79 104067 WASHER LOCK #10 INT STAR
31 101078 SCREW TAP 8-32 X 5/16 PH PAN BLK 80 005175 CHASSIS
32 021094 SPACER #4 X 1/4 81 017218 FOOT PLASTIC BLACK
33 004791 TRAY 82 104080 WASHER FLAT #10 CLEAR ZINC
34 101163 SCREW TC 8-32 X 1/4 PH PN TYPE F 83 100159 SCREW 10-32 X 3/4 PH PN BLK
35 106007 SPRING CLIP LATCH TYPE 84 101109 SCREW TAP 6-32 X 5/16 PH PN BLK
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
27 28
MC206
REPACKING INSTRUCTION
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 040818
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